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USER`S MANUAL

1. Receiver Line Status Interrupt i e Overrun error Parity error Framing error or Break Interrupt Received Data Available FIFO level reached or Character Time Out Transmitter Holding Register Empty or Modem Status CTS DSR RI or DCD Multiple port Interrupts share the IntReq0 line according to a shifting priority scheme based on the last interrupting port serviced 1P501 64 units also include interrupts for received XOFF signal special character DRIVERS Termination Resistors 1200 Termination Resistors are installed in sockets on board and may be removed if required see Drawing 4501 555 for location Install termination resistors at the end of a network only Bias Resistors 5600 pullup to 5V on output lines 5600 pull down to COM on lines installed in sockets on board and may be removed if required see Drawing 4501 555 for location Only one set of bias resistors should be installed per line pair Line Driver Linear Technology LTC487CS or equivalent Designed for EIA TIA 422B or EIA 485 applications Differential Output Voltage 5V Maximum Unloaded 2V Minimum EIA TIA 422B 50 load 1 5V Minimum 485 27 load Common Mode Output Voltage 3V Maximum Output Short Circuit Current 250mA Maximum Rise or Fall Time 5n
2. 3 CARD CAGE CONSIDERATIONS 4 BOARD 4 4 4 5 5 6 6 8 CONNECTORS nennen tnnt IP Field Connector P2 Noise and Grounding Considerations IP Logic Interface Connector 1 3 0 PROGRAMMING ADDRESS MABS risen HARE PME IP Communication amp Configuration Registers ds IP Identification 2214 THE EFFECT RESET IP501 PROGRAMMING FIFO Polled Mode FIFO Interrupt Loopback Mode Operation E Interrupt Generation eene Software Flow Control Hardware Flow Control Programming Example 4 0 THEORY OF OPERATION EIA TIA 422B SERIAL INTERFACE 19 IP501 OPERATION nne terne 20 LOGIC POWER 21 5 0 SERVICE AND 85 21 SERVICE AND REPAIR ASSISTANCE 21 PRELIMINARY SERVICE PROCEDURE 21 6 0 5
3. 21 GENERAL 21 EIA TIA 422B 5 22 22 INDUSTRIAL I O PACK 22 9 23 CABLE MODEL 5025 550 amp 5025 551 23 CABLE MODEL 5029 943 23 TERMINATION PANEL MODEL 5025 552 23 TRANSITION MODULE MODEL TRANS GP 24 DRAWINGS Page 4501 434 IP MECHANICAL ASSEMBLY 25 4501 552 IP501 COMMUNICATION CONNECTIONS 25 4501 554 IP501 INTERFACE DIAGRAN 26 4501 555 501 TERM BIAS RESISTOR LOCATION 27 4501 553 IP501 BLOCK 28 4501 570 RS 422 INTERFACE LEVELS 29 4501 462 CABLE 5025 550 NON SHIELDED e 90 4501 463 CABLE 5025 551 SHIELDED 30 4501 464 TERMINATION PANEL 5025 552 es 31 4501 465 TRANSITION MODULE 31 IMPORTANT SAFETY CONSIDERATIONS It is very important for the user to consider the possible adverse effects of power wiring component sensor or software failures in designing any type of control
4. Schematic and Physical Attributes For Non Shielded cable model see Drawing 4501 462 For Shielded cable model see Drawing 4501 463 Shipping Weight 1 0 pound 0 5Kg packaged CABLE MODEL 5029 943 Type Model 5029 943 IP500 Communication Cable A five foot long flat 50 pin cable with a female connector on one end for connection to AVME9630 9660 or other compatible carrier boards and four DE 9P connectors serial ports on the other end Application Used to connect up to four DB 9 serial ports to AVME9630 9660 non intelligent carrier board connectors It is used primarily with Acromag Model IP500 IP501 amp IP502 serial communication modules Length 5 feet Cable 50 wire flat ribbon cable 28 gage Non Shielded cable model uses Acromag Part 2002 211 3M Type C3365 50 or equivalent Headers 50 pin female header with strain relief Header Acromag Part 1004 512 3M Type 3425 6600 or equivalent Strain Relief Acromag Part 1004 534 3M Type 3448 3050 or equivalent Port Connectors Four DE 9P 9 pin D SUB Male connectors with strain relief 3M connector U89809 9000 with 3448 8D09A strain relief or equivalent Keying 50 pin Header at one end has polarizing key to prevent improper installation Schematic and Physical Attributes See Drawing 4501 552 Shipping Weight 1 0 pound 0 5Kg packaged TERMINATION PANEL MODEL 5025 552 Type Termination Panel For AVME9630 9660 Boards Application To connect
5. 56 46 sus FORTA D PORTA PORT A 7 A 569 OHM porta Wop au rere 560 OHM PoRT8 N 60 OHM PORT C G PORT C PORT C port o 1 PORT D 560 OHM PORT D IP501 PARTIAL VIEW R9 a DETAIL A E aja om Zia 5 519 52 a ALL TRANSMITTING AND RECEIVING CHANNELS MAY HAVE TERMINATING RESISTORS RT AT BOTH ENDS OF THE NETWORK THE IP501 HAS USER REMOVEABLE PLUG IN SIP TERMINATION RESISTORS 120 OHM THERE MUST BE AT MOST SET OF BIAS RESISTORS ASSOCIATED WITH EACH PAIR OF SIGNAL WIRES TO KEEP THE NETWORK FROM FLOATING WHEN NO UNITS ARE TRANSMITTING THE TxD AND RTS LINES SOURCED FROM A PORT CAN BE PERMANENTLY ENABLED VIA SOFTWARE IF SO THE NETWORK BIAS ANO TERMINATION RESISTORS ASSOCIATED WITH EACH PAIR OF SIGNAL WIRES WILL NOT BE NEEDED THESE RESISTORS ARE INSTALLED IN SOCKETS AND CAN BE REMOVED IF THESE DRIVERS ARE ALWAYS ENABLED THE IDLE STATE OF THE TxD amp RxD DATA PAIRS ARE HIGH ON TxD amp RxD THIS CORRESPONDS TO A MARK 1 ON THE DATA LINE THE RS232 DATA TRANSMISSION LINE ALSO IDLES AT A MARK 1 ON THE DATA LINE BUT THIS IS A LOW LEVEL ON THE TRANSMISSION LINE DUE TO THE INVERTING NATURE OF THE DRIVERS THE IDLE STATE OF THE RTS amp CTS TRANSMISSION PAIRS IS THAT THESE CONTROL LINES ARE DEASSERTED OFF THIS IS THE SAME AS RS232 RS232 CONTROL LINES ARE ASSERTED ON AS HIGH LEVEL IN THE Actoaag mum CAB
6. Programmable Baud Rate The internal baud rate generator allows the 8MHz clock to be divided by any divisor between 1 and 2 97 providing support for any bit rate up to 512Kbps Interrupt Support Individually controlled transmit receive line status data set amp flow control IP501 64 interrupts may be generated and unique interrupt vectors assigned to each port Interrupts use a priority shifting scheme based on the last interrupt serviced preventing the continuous interrupts of one port from blocking the interrupts of another port Flow Control The IP501 64 includes support for software and hardware flow control for more efficient data transfer Socketed Termination and Bias Resistors The network termination and bias resistors are installed in sockets on the board and may be easily inserted or removed where required Handshake Modem Control Signals Each serial channel includes a modem control and modem status register that provides handshake support for RTS amp CTS Internal Diagnostic Capabilities Loopback controls for communication link fault isolation are included Break parity overrun and framing error simulation is also possible Failsafe Receivers The receivers employed in this model include a fail safe feature which guarantees a high output state when the inputs are left open or floating Extended Temperature Performance Option Model 1P501 16E units support operation from 40 C to 85 C Industry Standard 1
7. 1 Note that access to this register is granted only after writing BF to the Line Control Register LCR EFR Bits 0 7 are set to 0 upon power up or system reset XON XOFF 1 2 Registers Ports A D R W Model IP501 64 Only These registers hold the programmed XON and XOFF characters for software flow control XON or XOFF characters may be 1 or 2 bytes long The UART compares incoming data to these values and restarts XON or suspends XOFF data transmission when a match is detected Note that access to these registers are granted only after writing BF to the Line Control Register LCR All XON XOFF bits are set to 0 upon power up or system reset Refer to Software Flow Control later in this section for more information IER Interrupt Enable Register Ports A D R W The Interrupt Enable Register is used to independently enable disable the four possible serial channel interrupt sources that drive the INTREQO line Ports A D share this line Interrupts are disabled by resetting the corresponding IER bit low 0 and enabled by setting the IER bit high 1 Disabling the interrupt system IER bits 0 3 low also inhibits the Interrupt Identification Register IIR and the interrupt request line INTREQO All other functions operate in their normal manner including the setting of the Line Status Register LSR and the Modem Status Register MSR Interrupt Enable Register Received Data Available In
8. A LA 2 LA 2 2 z 2 2 2 LA 2 2 2 2 z 2 STRAIN RELIEF 1004 534 A C ser SSC ox 16 1e1 Esser 462 Al PIN 50 OF P1 amp P2 CONNECT TO GROUND SHIELD P1 TO AVME9630 9660 CARRIER BOARD GROUND SHIELO ON BACK SIDE OF CABLE MODEL 5025 552 1 0 TERMINATION P3 OR P4 PS P6 X FEET TOP VIEW STRAIN RELIEF m RIBBON CABLE BLACK LINE ON CABLE CONNECTOR 1004 534 2002 261 INDICATES PIN 50 1004 512 POLARIZING KEY 50 PIN CONNECTOR PIN 1 ON CABLE 1004 512 NO MARKINGS STRAIN RELIEF 1004 534 FRONT VIEW NOTE SEVEN DIGIT PART NUMBERS ARE ACROMAG PART NUMBERS XXXX XXX A lt romag MODEL 5025 551 x SIGNAL CABLE SHIELDED Ato 09 rra pE 1 1 1 4561 53 1 2 3 4 5 6 7 8 8 101112131415 16 17 1H 19 20 21 22 23 24 25 26 27 28 29 39 31 32 33 34 35 36 37 38 39 48 41 42 43 44 45 46 47 48 49 59 P1 1 2 3 4 5 6 7 8 8 10 111213 1415 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 38 48 41 42 43 44 45 46 47 48 48 50 MODEL 5025 552 TERMINATION PANEL SCHEMATIC G RAIL DIN MOUNTING SHOWN HERE TERMINATION DIN EN 50035 32mm PANEL ACROMAG PART NUMBER 4001 040 T RAIL DIN MOUNTING SHOWN HERE DIN EN 50022 35mm SCREWORIVER SLOT FOR REMOVAL FROM RAIL SIDE VIEW NOTES DIMENSIONS ARE
9. LINES TO ACHIEVE FULL DUPLEX A SINGLE DCE NODE FOR WHICH THE MESSAGE WAS INTENDED MAY PROVIDE AN APPROPRIATE RESPONSE AT THE SAME TIME IT IS RECEIVING ASSERTING CTS COULD BE USED AS A MECHANISM TO INDICATE THIS TRANSMISSION DATA IS SENT BY THE OCE UNIT OVER THE RxD AND RxD LINES WHEN DTE TRANSMISSION IS COMPLETE THE DTE NODE RELEASES RTS THIS CAUSES RTS TO MOVE TO THE DEASSERTED OR IDLE STATE WHEN DCE TRANSMISSION 15 COMPLETE THE DCE NODE RELEASES CTS THIS CAUSES CTS TO MOVE TO THE DEASSERTED OR IDLE STATE IP501 TERMINATION AND BIAS SIP RESISTOR LOCATION DRAWING RESISTOR IDENTIFICATION FOR REMOVAL AND REPLACEMENT WHERE REQUIRED SEE DRAWING 4501 554 viue Function PORT em REIN or radh ETE EI POSITION IS IDENTIFIED BY A DOT MODEL 1 501 COMPONENT SIDE PARTIAL VIEW 1 RxD C TERMINATION PORT C T RESISTOR SIPS ARE MOUNTED 129 OHM CTS C TERMINATION PORT a 3 2 aiala N N x gt D 2 IN SOCKETS AND CAN BE REMOVED IF REQUIRED RxD D TERMINATION PORT D M 120 OHM 0 TERMINATION PORT D 120 OHM 0A TERMINATION PORTA RESISTOR SIPS ARE 8 120 RTS A TERMINATION PORT A AS SHOWN 120 OHM TwD B TERMINATION PORTB 120 OHM RTS B TERMINATION PORT 8 N TxD C TERMINATION PORT C 129 PORT C 120 0 0 TERMINATION PORT D PORT 559
10. These registers are listed below along with their mnemonics used throughout this manual RBR THR LSR MSR LCR FCR MCR DLL SCR EFR XON 1 XON 2 XOFF 1 XOFF 2 Shaded register entries apply to Model IP501 64 only and are accessible only after writing BF to the Line Control Register LCR LCR FCR MCR DLL SCR LEER 1_ XON 2 XOFF 1 XOFF 2 The I O space may be as large as 64 16 bit words 128 bytes using address lines A1 A6 but the IP501 uses only a portion of this space The I O space address map for the IP501 is shown in Table 3 1 Note the base address for the IP module I O space see your carrier board instructions must be added to the addresses shown to properly access the I O space All accesses are performed on an 8 bit word basis DO D7 This manual is presented using the Big Endian byte ordering format Big Endian is the convention used in the Motorola 68000 microprocessor family and is the VMEbus convention In Big Endian the lower order byte is stored at odd byte addresses Thus byte accesses are done on odd address locations The Intel x86 family of microprocessors use the opposite convention or Little Endian byte ordering Little Endian uses even byte addresses to store the low order byte As such use of this module on an ISAbus PC AT carrier board will require the use of the even address locations to access the 8 bit data while a VMEbus carri
11. clear these values are latched when EFR bit 4 is cleared 10 SERIES IP501 INDUSTRIAL I O PACK EIA TIA 422B SERIAL COMMUNICATION MODULE IIR Interrupt Identification Register Ports A D READ Only The Interrupt Identification Register IIR is used to indicate that a prioritized interrupt is pending and the type of interrupt that is pending This register will indicate the highest priority type of interrupt pending for the channel Individual serial channels prioritize their interrupts into four levels indicated below or six levels IP501 64 models This helps minimize software overhead during data character transfers Additionally with respect to the four channels sharing interrupt request line 0 IntReqO interrupts are served according to a shifting priority scheme that is a function of the last interrupting port served PRIORITY LEVE INTERRUPT L Receiver Line Status Received Data Ready or Character Time out Transmitter Holding Register Empty Modem Status 5 Software Flow Control Interrupt RxRDY Received XOFF signal Special Character 6 1015 RTS Change of State Priority Levels 5 amp 6 apply to IP501 64 models only The four lower order bits of this register are used to identify the interrupt pending all units as shown below Bits 4 amp 5 are used to identify the additional interrupts possible for IP501 64 models Interrupt Identification Register All Models BITS INT INTERRUPT
12. INTERRUPT RESET 3 0 PRTY TYPE SOURCE CONTROL 0001 a None Bits 4 and 5 of this register are always set to 0 on standard units Bits 6 and 7 are set to 1 when bit 0 of the FIFO Control Register is set to 1 bits 6 amp 7 are 0 in 16C450 mode A power up or system reset sets IIR bit 0 to 1 bits 1 7 to 0 Interrupt Identification Register Model IP501 64 Only BITS INT 5 4 PRTY INTERRUPT SOURCE 1 5 Received XOFF Signal Special Character 1 0 6 CTS RTS Change of State Detected Bits 4 amp 5 are permanently set to 0 on IP501 16 models FCR FIFO Control Register Ports A D WRITE Only This write only register is used to enable and clear the FIFO buffers set the trigger level of the Rx FIFO and select the type of DMA signaling DMA is NOT supported by this model IP501 64 models also allow the trigger level of the Tx FIFO to be set A power up or system reset will reset all FCR bits to 0 FIFO Control Register FCR BIT When set to 1 this bit enables both the Tx and Rx FIFO s All bytes in both FIFO s can be cleared by resetting this bit to 0 Data is cleared automatically from the FIFO s when changing from FIFO mode to the alternate 16C450 mode and visa versa Programming of other FCR bits is enabled by setting this bit to 1 When set to 1 this bit clears all bytes in the Rx FIFO and resets the counter logic to 0 this does not clear the shift
13. bit is equivalent to DTR in the MCR during local loopback mode RI NOT SUPPORTED This bit is equivalent to OP1 in the MCR during local loopback mode DCD NOT SUPPORTED This bit is equivalent to OP2 in the MCR during local loopback mode Note that whenever MSR bits 3 0 are set to 1 a modem status interrupt is generated An Asterisk is used to indicate an active low signal Note that reading MSR clears the delta modem status indication bits 0 3 but has no effect on the other status bits For both the LSR amp MSR the setting of the status bit during a status register read operation is inhibited the status bit will not be set until the trailing edge of the read However if the same status condition occurs during a read operation that status bit is cleared on the trailing edge of the read instead of being set again In Loopback Mode when the modem status interrupts are enabled the CTS input is ignored However a modem status interrupt can still be generated by writing to MCR bit 0 see Loopback Mode Operation section Note that not all UART signal paths are used by this model and their corresponding UART pins are tied high 45V This includes RI Ring Indicator DSR Data Set Ready and DCD Data Carrier Detect In addition the UART DTR Data Terminal Ready signal path is used to control the receiver enables for the port while the RTS signal is used in combination with the TEA Transmit Enable Alw
14. change in signal level may contain more than one bit as is the case with most phone modems While bits per second bps refers to the actual number of bits transmitted in one second the baud rate refers to the number of signal level changes that may occur in one second Thus 2400 baud does not equal 2400 bits per second unless 1 bit is sent per electrical signal Likewise a 1200bps or 2400bps modem operates at a signalling rate of only 600 baud since they encode 2 and 4 bits respectively in one electrical impulse through amplitude phase and frequency modulation techniques However for this device the baud rate is considered equivalent to the bit rate This model includes a separate data path for Transmit and Receive providing full duplex communication Paths for the two most common handshake signals Request to Send RTS and Clear to Send CTS are also included Pins 1 18 and pins 26 43 of the field I O connector P2 provide connectivity to serial Ports A D of this module Refer to Table 2 1 for pin assignments Note that a suffix of A _B _C or _D is appended to the signal names to indicate their port association Each of these signals are described in detail below assuming that a local DTE device PC is connected to a local DCE device modem communicating over a telephone line to a remote DCE device remote modem connected to a remote DTE another PC Note that not all UART signal paths are used by t
15. or monitoring system This is especially important where economic property loss or human life is involved It is important that the user employ satisfactory overall system design It is agreed between the Buyer and Acromag that this is the Buyer s responsibility 1 0 GENERAL INFORMATION The Industrial I O Pack IP Series IP501 module provides four EIA TIA 422B serial communication ports for interfacing to the VMEbus or ISAbus according to your carrier board For half duplex EIA 485 applications the model IP502 is recommended but the model IP501 can be used to implement an EIA 485 interface operating in full duplex Full duplex data paths for Transmit Tx Receive Rx and the Request to Send RTS and Clear to Send CTS handshake lines are included Four units may be mounted on a carrier board to provide up to 16 asynchronous serial ports per System slot The transmit and receive paths of each channel on IP501 16 units include generous 16 byte FIFO buffers to minimize CPU interaction Model IP501 64 units utilize 64 byte FIFO buffers and include software flow controls Full duplex EIA TIA 422B and EIA 485 DB 9 signal support for the common RTS and CTS handshake lines is included Character size stop bits parity and baud rate are software configurable Prioritized interrupt generation is also supported for transmit receive line status and data set conditions The IP501 utilizes state of the art Surface Mounted Technology SMT
16. the transmission When software flow control is enabled the UART of this model will compare two sequential received data bytes with preprogrammed XOFF 1 2 characters When an XOFF match is detected the UART will halt transmission after completing the transmission of the current character The receive ready flag of the Interrupt Identification register will be set IIR bit 4 is set to 1 when the XOFF character has been detected only if enabled via bit 5 of the Interrupt Enable register IER bit 5 is used to enable the received XOFF interrupt An interrupt will then be generated After recognition of the XOFF characters the UART will compare the next two incoming characters with the preprogrammed XON 1 2 characters If a match is detected the UART will resume transmission and clear the received XOFF interrupt flag Interrupt Identification Register bit 4 After more data has been received the UART will automatically send XOFF 1 2 characters as soon as the received data passes the programmed FIFO trigger level causing the host to suspend transmission The UART will then transmit the programmed XON 1 2 characters as soon as the received data reaches the next lowest trigger level thus causing the host to resume transmission received data trigger levels are 8 16 56 and 60 When single XON XOFF characters are selected the UART compares the received data to these values and controls the transmission accordingly XON restart transmis
17. to achieve its wide functionality and is an ideal choice for a wide range of industrial communication interface applications that require a highly reliable high performance interface atalow cost For isolated interface requirements refer to the Acromag Model IP511 KEY IP501 FEATURES High Density Provides programmable control of four EIA TIA 422B serial ports Four units mounted on a carrier board provide 16 serial channels in a single VMEbus or ISAbus PC AT system slot Large FIFO Buffers The transmit and receive channels of each serial port provide generous 16 character IP501 16 or 64 character IP501 64 data buffering This gives the host CPU additional time to process other applications and reduces CPU interactions and interrupts Programmable Character Size Each serial port is software programmable for 5 6 7 or 8 bit character sizes 9 Programmable Stop Bits Each serial port allows 1 1 1 2 or 2 stop bits to be added to or deleted from the serial data stream Programmable Parity Generation Detection Even Odd or No Parity generation and detection is supported e Line Break Generation amp Detection provision for sending and detecting the line break character is provided e False Start Bit Detection Prevents the receiver from assembling false data characters due to low going noise spikes on the RxD input line SERIES IP501 INDUSTRIAL I O PACK EIA TIA 422B SERIAL COMMUNICATION MODULE
18. 05 Hex THE EFFECT OF RESET A software or hardware reset puts the serial channels into an idle mode until initialization programming A reset initializes the receiver and transmitter clock counters It also clears the Line Status Register LSR except for the transmitter shift register empty TEMT and transmit holding register empty THRE bits which are set to 1 note that when interrupts are subsequently enabled an interrupt will occur due to THRE being set The Modem Control Register MCR and the Transmitter Enable Always Register TEA are also cleared All of the discrete signal lines memory elements and miscellaneous logic associated with these register bits are cleared de asserted or turned off However the Line Control Register LCR divisor latches Receiver Buffer Register RBR and Transmitter Holding Register THR are not affected The following table summarizes the effect of a reset on the various registers and internal and external signals The Effect of Reset REGISTER RESET SIGNAL CONTROL STATE EFFECT REGISTERS IER Reset All Bits low Bits 0 3 forced low Bits 4 7 permanently low Reset Bit 0 high Bits 1 2 3 6 7 low Bits 4 amp 5 permanently low All bits low bits 5 7 permanently low amp 6 which are high Bits 0 3 low bits 4 7 per corresponding input signal Reset Bits 0 3 low bits 4 7 are unused and always read nigh EFR XON 1 2 XOFF 1 2 Read LSR Reset Buffer Regis
19. 64 Models SERIES IP501 INDUSTRIAL I O PACK EIA TIA 422B SERIAL COMMUNICATION MODULE LCR Line Control Register Ports A D Read Write The individual bits of this register control the format of the data character as follows Line Control Register LCR Bit FUNCTION PROGRAMMING Word Length Select Stop Bit Select 3 Parity Enable 5 Data Bits 0 1 6 Data Bits 1 0 7 Data Bits 1 1 8 Data Bits 2 1 Stop Bit 1 5 Stop Bits if 5 data bits selected 2 Stop Bits if 6 7 or 8 data bits selected 0 Parity Disabled 1 Parity Enabled A parity bit is generated and checked for between the last data word bit and the stop bit 0 Odd Parity 1 Even Parity 0 Stick Parity Disabled 1 Stick Parity Enabled When parity is enabled stick parity causes the transmission and reception of a parity bit to be in the opposite state from the value selected via bit 4 This is used as a diagnostic tool to force parity to a known state and allow the 4 Even Parity Select receiver to check the parity bit in a 5 Stick Parity known state Break 0 Break Disabled Control 1 Break Enabled When break is enabled the serial output line TxD is forced to the space state low This bit acts only on the serial output and does not affect transmitter logic For example if the following sequence is used no invalid characters are transmitted due to the presence of the break 1 Load a zero byte in respo
20. 6550 Family UART w 16C450 Mode The UART of this device is a member of the industry standard 16550 family of UART s and remains software compatible Additionally this device can operate in a 160450 UART family software compatible mode The transmit and receive channels are double buffered in this mode Hold and shift registers eliminate the need for precise synchronization between the host CPU and the serial data INDUSTRIAL I O PACK INTERFACE FEATURES e High density Single size industry standard IP module footprint Four units mounted on a carrier board provide up to 16 serial ports in a single system slot Both VMEbus and ISAbus PC AT carriers are supported Local ID Each IP module has its own 8 bit ID PROM which is accessed via data transfers in the ID Read space 8 bit I O Port register Read Write is performed through 8 bit data transfer cycles in the IP module I O space High Speed Access times for all data transfer cycles are described in terms of wait states 2 wait states are required for reading and writing channel data and for interrupt select cycles 1 wait state for reading the ID PROM see the Specifications section for detailed information SIGNAL INTERFACE PRODUCTS See Appendix for more information on compatible products This IP module will mate directly to any industry standard IP carrier board including Acromag AVME9630 9660 3U 6U non intelligent VMEbus carrier boards Additionally ISAbus PC AT
21. 80 3 or equivalent This provides excellent connection integrity and utilizes gold plating in the mating area Threaded metric M2 screws and spacers are supplied with the IP module to provide additional stability for harsh environments see Drawing 4501 434 for assembly details Field and logic side connectors are keyed to avoid incorrect assembly The pin assignments of P1 are standard for all IP modules according to the Industrial I O Pack Specification see Table 2 2 Table 2 2 Standard Logic Interface Connections P1 Pin Description Number Pin Description Number 1 GD 2 2 y 2 RW 2 DO IDSEL 29 DMARegqi 22 ite 33 005 D06 10 D09 13 DMAEnd 3 D2 16 A 4 17 4 D4 m 4 19 rReqt 44 20 a 45 STROBE 46 22 A 4 An Asterisk is used to indicate an active low signal BOLD ITALIC Logic Lines are NOT USED by this IP Model a 6 8025 9 D05 SERIES IP501 INDUSTRIAL I O PACK EIA TIA 422B SERIAL COMMUNICATION MODULE 3 0 PROGRAMMING INFORMATION ADDRESS MAPS This board is addressable in the Industrial Pack I O space to control the interface configuration data transfer and steering logic of four EIA TIA 422B serial ports As such three types of information are stored in the I O space control status and data
22. AVME9630 9660 boards within the card cage via flat 50 pin ribbon cable cable Model 5025 550 X or 5025 551 X Mounting Transition module is inserted into a 6U size single width slot at the rear of the VMEbus card cage Printed Circuit Board Six layer military grade FR 4 epoxy glass circuit board 0 063 inches thick Operating Temperature 40 C to 85 C Storage Temperature 55 C to 105 C Shipping Weight 1 25 pounds 0 6Kg packaged 24 M2 x 6 sas Be FLAT HEAD SCREW I eee SIDE 2 OF IP MODULE 2 1 THREADED M2 J 19 COMPONENT SIDE SPACER OF CARRIER BOARD 3 3 Ei P1 CONNECTOR FRONT PANEL CONNECTOR OR Be SCREW 4 ASSEMBLY PROCEDURE 4 1 THREADED SPACERS ARE PROVIDED IN TWO DIFFERENT LENGTHS THE SHORTER LENGTH IS FOR USE WITH AVME 9630 9660 CARRIER BOARDS SHOWN CHECK YOUR CARRIER BOARD TO DETERMINE ITS REQUIREMENTS MOUNTING HARDWARE PROVIDED MAY NOT BE COMPATIBLE WITH ALL TYPES OF CARRIER BOARDS 2 INSERT FLAT HEAD SCREWS ITEM A THROUGH SOLDER SIDE OF IP MODULE AND INTO HEX SPACERS ITEM B AND TIGHTEN 4 PLACES UNTIL HEX SPACER IS COMPLETELY SEATED 5 3 CAREFULLY ALIGN IP MODULE TO CARRIER BOARD AND PRESS 5 TOGETHER UNTIL CONNECTORS AND SPACERS ARE SEATED 4 INSERT PAN HEAD SCREWS ITEM C THROUGH SOLDER SIDE OF CARRIER BOARD AND INTO HEX SPACERS ITEM B AND TIGHTEN 4 PLACES IP MODULE TO CAR
23. Acromag 3 Series IP501 Industrial I O Pack Quad EIA TIA 422B Communication Module USER S MANUAL ACROMAG INCORPORATED 30765 South Wixom Road P O BOX 437 Wixom MI 48393 7037 U S A Tel 248 624 1541 Fax 248 624 9234 Copyright 1995 Acromag Inc Printed in the USA Data and specifications are subject to change without notice 8500 541 G02H003 SERIES IP501 INDUSTRIAL I O PACK EIA TIA 422B SERIAL COMMUNICATION MODULE The information contained in this manual is subject to change without notice Acromag Inc makes no warranty of any kind with regard to this material including but not limited to the implied warranties of merchantability and fitness for a particular purpose Further Acromag Inc assumes no responsibility for any errors that may appear in this manual and makes no commitment to update or keep current the information contained in this manual No part of this manual may be copied or reproduced in any form without the prior written consent of Acromag Inc Table of Contents Page 1 0 GENERAL INFORMATION 2 KEY IP501 FEATURES 2 INDUSTRIAL I O PACK INTERFACE FEATURES 3 SIGNAL INTERFACE PRODUCTS 3 INDUSTRIAL PACK SOFTWARE LIBRARY 3 2 0 PREPARATION FOR 3 UNPACKING AND
24. E v 1 MARK 1 DIFFERENCE VOLTAGE TxD TxD RxD RxD RS 422 IS CONSIDERED A BALANCED DIFFERENTIAL TRANSMISSION STANDARD BECAUSE THE VOLTAGE OF ONE SIGNAL LINE IS TAKEN WITH RESPECT TO ANOTHER TO DETERMINE THE SIGNAL LEVEL NOTE THAT ONLY ONE SET OF NETWORK BIAS RESISTORS SHOULD EXIST PER NETWORK WIRE PAIR MODEL IP501 BOARDS HAVE THESE RESISTORS INSTALLED IN SOCKETS ON THE BOARD p NOTE THAT RTS CTS LINES ARE INVERTED WITH RESPECT TO THE AND INPUTS OF THE RECEIVERS AND OUTPUTS OF THE ORIVERS TTL i ON el L ON v 1 OFF DIFFERENCE VOLTAGE RTS RTs CTS crs RS 422B CONNECTOR IP501 DB9 MALE SIGNAL GROUND TxD TRANSMIT DATA RTS REQUEST TO SEND TxD TRANSMIT DATA RxD RECEIVE DATA RxD RECEIVE DATA sc e be Mag 85 Laree EU UNDERSTANDING RS 422 INTERFACE LEVELS 2 TO AVME9630 9660 CARRIER BOARD P3 OR P4 P5 P6 STRAIN RELIEF 1004 534 50 PIN CONNECTOR 1004 512 NOTE SEVEN DIGIT PART NUMBERS ARE ACROMAG PART NUMBERS X FEET TOP VIEW NON SHIELDED x RIBBON CABLE 2002 211 PIN 1 ON CABLE IS DESIGNATED WITH RED INK FRONT VIEW MODEL 5025 550 x SIGNAL CABLE NON SHIELDED MODEL 5025 552 1 0 TERMINATION CONNECTOR 1004 512 N NS H tA LA 4 2 7
25. E DEASSERTED IF NO NODES ARE DRIVING CTS THEN THE BIAS RESISTORS ON THE NETWORK KEEP CTS DEASSERTED THE IDLE STATE THE DTE NODE ASSERTS RTSe THIS ASSERTS RTS AT ALL DCE NODES 3 WITH MORE THAN TWO NODES ON THE NETWORK IT WOULD NOT MAKE SENSE FOR THE DTE NODE TO WAIT FOR A CTS ASSERTION BEFORE TRANSMITTING BECAUSE MORE THAN ONE RECEIVING NODE WOULD HAVE TO ASSERT THEIR CTS SIGNAL SATISFY OTE NODE THUS NODE MAINTAINS THE ASSERTION OF RTS AND TRANSMITS ITS DATA DATA IS TRANSMITTED VIA THE TxD AND TxD LINES TO ACHIEVE FULL DUPLEX A SINGLE DCE NODE FOR WHICH THE MESSAGE WAS INTENDED MAY PROVIDE AN APPROPRIATE RESPONSE AT THE SAME TIME IT IS RECEMNG ASSERTING CTS COULD BE USED AS MECHANISM TO INQXCATE THIS TRANSMISSION DATA IS SENT BY THE DCE UNIT OVER THE RxD AND RxD LINES WHEN OTE TRANSMISSION iS COMPLETE THE OTE NODE RELEASES THIS CAUSES RTS TO MOVE TO DEASSERTED OR IDLE STATE WHEN DCE TRANSMISSION IS COMPLETE THE NODE RELEASES THIS CAUSES CTS TO MOVE TO THE DEASSERTED OR IDLE STATE TxD ENABLE NOTES CONCERNING RESISTOR PLACEMENT AND REMOVAL FOR RT AND RB 1 ALL TRANSMITTING AND RECEIVING CHANNELS MAY HAVE TERMINATING RESISTORS RT AT BOTH ENDS OF THE NETWORK THE IP5Q1 HAS THESE RESISTORS 120 OHM INSTALLED IN SOCKETS AND THEY MAY BE REMOVED AS REQUIRED 2 THERE MUST BE AT MOST ONE SET OF BIAS RESISTORS ASS
26. ERIAL COMMUNICATION MODULE A programmable logic device is used to control the interface between the UART the IP bus the line drivers and receivers and the IDPROM Note that the field serial interface to the carrier board provided through connector P2 refer to Table 2 1 is NON ISOLATED This means that the field signal return and logic common have a direct electrical connection to each other As such care must be taken to avoid ground loops see Section 2 for connection recommendations Ignoring this effect may cause operation errors and with extreme abuse possible circuit damage Refer to Drawing 4501 552 for example communication wiring and grounding connections LOGIC POWER INTERFACE The logic interface to the carrier board is made through connector P1 refer to Table 2 2 Not all of the IP logic P1 pin functions are used P1 also provides 5V to power the module 12V is not used A programmable logic device installed on the IP Module provides the control signals required to operate the board It decodes the selected addresses in the I O and ID spaces and produces the chip selects control signals and timing required by the communication registers and ID PROM as well as the acknowledgement signal required by the carrier board per the IP Specification It also prioritizes the interrupt requests coming from the serial ports in a shifting priority fashion based on the last interrupt serviced The ID PROM read only ins
27. IN INCHES MILLIMETERS TOLERANCE 2 5 1 3 5 7 9 1113 15 17 19 21 23 25 27 29 33 35 37 39 41 43 45 47 49 MODEL 5025 552 TERMINATION PANEL Acromag WIXOM MICH TITLE FRONT VIEW CONNECTORS ON PC BOARD MODEL TRANS GP MODULE SCHEMATIC CONNECTORS ON FRONT PANEL TOP VIEW PEG 9 19 233 4 Acto Q9 u we MODEL TRANS GP TRANSITION MODULE p we
28. LE RTS AND CTS ARE ALSO ASSERTED ON AS A HIGH LEVEL IN 50 MICHT m THE CABLE THIS IS ACCOMPLISHED BY INVERTING THE DRIVER amp ME sgi TERMINATIONZBIAS RESISTOR LOCATION RECEIVER OUTPUT INPUT LINES 0 5 1__ 1 1 45 1 555 gt i m uv D t IE 3 2 als gt H 8 568 Ton T B D LE 2 E Em H RS 422 485 MI DRIVERS amp IP501 BLOCK DIAGRAM RECEIVERS RxD4 NOTE TERMINATION RESISTOR RT AND mo BIAS RESISTOR RB SIPS ARE MOUNTED LOCIC RxD T IN SOCKETS AND MAY BE REMOVED INTERFACE IF REQUIRED SEE DRAWING 4501 555 DATA BUS ADDRESS BUS RIS CONTROL BUS PORT 1 0 m ETE CONTROL LOGIC GENERATOR ID PROM ONE OF FOUR PORTS SHOWN AT LEFT FOR REFERENCE OTHERS ARE IDENTICAL ACKNOWLEDGE lt ine CONTROL LOGI Rx Tx ENABLES COMMON SUPPLY FILTERING EAV P2 PINS 1 10 19 26 35 amp 44 50 ARE SIGNAL COMMON COMMON a Acrom olara 7 8 57 e 138 867 85 BC 29 20 95 per 7 tow IP501 BLOCK DIAGRAM p ipsos 1 11 45 1 553 6 l H NOTE 1 NES 0 SPAC
29. LE THIS IS ACCOMPLISHED BY INVERTING THE DRIVER amp RECEIVER DUTPUT INPUT LINES UNIT 2 DCE RxD_ ENABLE 8 va TxD ENABLE RS422 RS485 FULL DUPLEX MULTIDROP NETWORK UNIT DCE RKO ENABLE 1 POSSIBLE TRANSMISSION SEQUENCE FOR COMMUNICATION CHANNELS ON AN 5422 455 FULL QUPLDX THO NODE NETWORK 1 THE DTE NODE WATS FOR CTS TO BECOME DEASSERTED IF NQ NODES ARE DRIVING RTS OR CTS THEN THE BIAS RESISTORS ON THE NETWORK KEEP RTS AND CTS DEASSERTED THE IDLE STATE THE DTE DCE MAY PERMANENTLY ENABLE ITS RTS CTS TRANSMITTER AND DRIVE THE PAIRS DEASSERTED STATE IN WHICH CASE THE NETWORK BIAS RESISTORS ARE NOT NEEDED THE MODEL IP581 HAS THESE RESISTORS INSTALLED IN SOCKETS AND THEY MAY BE REMOVED AS NECESSARY THE DTE NODE INDICATES iTS INTENTION TO TRANSMIT BY ASSERTING RTS THE DCE NODE RECEIVES THIS SIGNAL AND THEN ASSERTS CTS TO INDICATE READINESS TO THE DTE THE DTE MAINTAINS THE ASSERTION OF RTS AND TRANSMITS ITS DATA DATA 15 TRANSMITTED VIA THE TxD AND TxD LINES TO ACHIEVE FULL DUPLEX THE DCE MAY ECHO WHAT WAS SENT OR PROVIDE DIFFERENT APPROPRIATE RESPONSE AT THE SAME TIME IT 5 RECEIVING FROM THE WHEN TRANSMISSION IS COMPLETE THE DTE DEASSERTS RTS AND DCE OEASSERTS 6075 POSSIBLE TRANSMISSION SEQUENCE FOR COMMUNICATION CHANNELS ON AN RS485 FULL DUPLEX NETWORK THE DTE NODE WAITS FOR CTS TO BECOM
30. OCIATED WITH EACH PAIR OF SIGNAL WIRES TO KEEP THE NETWORK FROM FLOATING WHEN NO UNITS ARE TRANSMITTING THE TxD AND RTS LINES SOURCED FROM A PORT CAN BE PERMANENTLY ENABLEO VIA SOFTWARE IF SO THE NETWORK BIAS AND TERMINATION RESISTORS ASSOCIATED WITH EACH PAIR OF SIGNAL WIRES WILL NOT BE NEEOED THESE RESISTORS ARE INSTALLED IN SOCKETS AND CAN BE REMOVED IF THESE DRIVERS ARE ALWAYS ENABLED TxD_ ENABLE gs UNIT 2 DCE TxD_ ENABLE TxD_ ENABLE TxD ENABLE 4 THE IDLE STATE OF THE TxD RxD DATA PAIRS ARE HIGH ON TxO amp RxD THIS CORRESPONDS TO A MARK 1 ON THE DATA LINE THE RS232 DATA TRANSMISSION LINE ALSO IDLES AT A MARK 1 ON THE DATA LINE BUT THIS IS A LOW LEVEL ON THE TRANSMISSION LINE DUE TO THE INVERTING NATURE OF THE DRIVERS THE IDLE STATE OF THE RTS amp CTS TRANSMISSION PAIRS IS THAT HESE CONTROL LINES ARE DEASSERTEO OFF THIS IS THE SAME AS RS232 RS232 CONTROL LINES ARE ASSERTED ON AS A HIGH LEVEL IN THE CABLE RTS AND CTS ARE ALSO ASSERTED ON AS A HIGH LEVEL IN THE CABLE THIS IS ACCOMPLISHED BY INVERTING THE DRIVER amp RECEIVER OUTPUT INPUT LINES POSSIBLE TRANSMISSION SEQUENCE FOR COMMUNICATION CHANN ON AN RS422 485 FULL DUPLEX NODE NETWORK 1 THE DTE NODE WAITS FOR CTS TO BECOME DEASSERTED NO NODES ARE DRIVING RTS OR CTS THEN THE BIAS RESISTORS ON THE NETWORK KEEP RTS AND CTS DEASSERTED IDLE STATE THE DTE DCE MAY PERMANENTLY ENABLE IT
31. REQO to signal the host CPU that it can begin loading data into the transmit buffer The host should acknowledge the interrupt to clear it execute an interrupt select cycle then begin writing data repeatedly to the Transmitter Holding Register This loads the transmit FIFO and initiates transmission of serial data on the TxD line The first serial byte will take about 100us to transmit so it is likely that the transmit FIFO will fill before the first byte has been sent The receiving side may release CTS if it cannot keep up with the data stream In this case the host CPU would have to pause in loading the data to prevent lost data SERIES IP501 INDUSTRIAL I O PACK EIA TIA 422B SERIAL COMMUNICATION MODULE 11 Stop loading the transmit buffer then write OOH to the Modem Control Register MCR This clears the Request To Send bit and releases the RTS signal line signifying that transmission is complete 12 Read 01H from the Modem Status Register MSR This indicates that the receiving side has released its Clear To Send CTS signal in response to the transmitting side dropping its Request To Send signal RTS 13 Read data repeatedly from the Receiver Buffer Register After 14 bytes have been received or fewer bytes with a timeout an interrupt will be generated if the host CPU has not unloaded the receive FIFO 4 0 THEORY OF OPERATION This section contains information regarding the TIA EIA 422B serial
32. RIER BOARD MECHANICAL ASSEMBLY Arenos FEE om SI por 8e a gt NOTES CONCERNING RESISTOR PLACEMENT AND REMOVAL FOR RT AND RB 1 ALL TRANSMITTING AND RECEIVING CHANNELS MAY HAVE TERMINATING RESISTORS AT BOTH ENDS OF THE NETWORK 5 1 HAS THESE RESISTORS 128 OHM INSTALLED IN SOCKETS AND THEY MAY BE REMOVED AS REQUIRED THERE MUST BE AT MOST ONE SET OF BIAS RESISTORS ASSOCIATED WITH EACH PAIR CF SIGNAL WIRES TO KEEP THE NETWORK FROM FLOATING WHEN NO UNITS ARE TRANSMITTING THE Tx AND RTS LINES SOURCED FROM A PORT CAN BE PERMANENTLY ENABLED VIA SOFTWARE IF SO THE NETWORK BIAS AND TERMINATION RESISTORS ASSOCIATED WITH EACH PAIR OF SIGNAL WIRES WILL NOT BE NEEDED THESE RESISTORS ARE INSTALLED SOCKETS AND CAN BE REMOVED IF THESE DRIVERS ARE ALWAYS ENABLED RxD_ ENABLE _ 4 IDLE STATE OF THE TxD amp RxD DATA PAIRS ARE HIGH ON TxD amp RxD THIS CORRESPONDS TO MARK 1 ON THE DATA LINE THE RS232 DATA TRANSMISSION LINE ALSO IDLES AT A MARK 1 ON THE DATA LINE BUT THIS IS LOW LEVEL ON TRANSMISSION LINE DU TO THE INVERTING NATURE OF THE ORIVERS 5 THE IOLE STATE OF THE RTS amp CTS TRANSMISSION PAIRS IS THAT THESE CONTROL LINES ARE DEASSERTED OFF THIS IS THE SAME AS RS232 RS232 CONTROL LINES ARE ASSERTED ON AS A HIGH LEVEL IN THE CABLE RTS AMO CTS ARE ALSO ASSERTEC ON AS A HIGH LEVEL IN THE CAB
33. S RTS CTS TRANSMITTER AND DRIVE THE PAIRS THE DEASSERTED STATE IN WHICH CASE THE NETWORK BIAS RESISTORS ARE NOT NEEDED THE MODEL IP501 HAS THESE RESISTORS INSTALLEO IN SOCKETS AND THEY MAY BE REMOVED AS NECESSARY THE OTE NODE INDICATES ITS INTENTION TO TRANSMIT BY ASSERTING RTS THE DCE NODE RECEIVES THIS SIGNAL AND THEN ASSERTS CTS TO INDICATE READINESS TO THE DTE THE OTE MAINTAINS THE ASSERTION OF RTS AND TRANSMITS ITS DATA DATA IS TRANSMITTED VIA TxD AND TxD LINES TO ACHIEVE FULL DUPLEX THE DCE MAY ECHO WHAT WAS SENT OR PROVIDE A DIFFERENT APPROPRIATE RESPONSE AT THE SAME TIME IT IS RECEIVING FROM THE DTE WHEN TRANSMISSION IS COMPLETE THE DTE DEASSERTS RTS AND THE DCE DEASSERTS CTS A POSSIBLE TRANSMISSION SEQUENCE FOR COMMUNICATION CHANNELS ON RS485 FULL DUPLEX NETWORK 1 THE DTE NODE WAITS FOR CTS TO BECOME IF NODES ARE DRIVING CTS THEN THE BIAS RESISTORS ON THE NETWORK KEEP CTS THE IDLE STATE THE DTE NODE ASSERTS RTS THIS ASSERTS RTS AT ALL NODES 3 WITH MORE THAN TWO NODES ON THE NETWORK IT WOULD NOT MAKE SENSE FOR THE OTE NODE TO WAIT FOR A CTS ASSERTION BEFORE TRANSMITTING BECAUSE MORE THAN ONE RECEIVING NODE WOULD HAVE TO ASSERT THEIR CTS SIGNAL SATISFY THE DTE NODE THUS THE DTE NODE MAINTAINS THE ASSERTION OF RTS AND TRANSMITS ITS DATA DATA 15 TRANSMITTED TxD AND TxD
34. SAMA PMC 33 1 test procedures Resistance to EMI Unit has been tested with no data upsets under the influence of EMI from switching solenoids commutator motors and drill motors Surge Withstand Capability Interface lines exhibit no damage when tested with a standardized test waveform representative of surges high frequency transient electrical interference per ANSI IEEE C37 90 1978 ESD EIA TIA 422B lines are protected from ESD voltages to x 10KV SERIES IP501 INDUSTRIAL I O PACK EIA TIA 422B SERIAL COMMUNICATION MODULE EIA TIA 422B PORTS Configuration Four independent non isolated EIA TIA 422B serial ports with a common signal return connection Data Rate sis qas Sus kasa oa Programmable to 512K bits sec using internal baud rate generator Interface Asynchronous serial only Maximum Cable Lenglh 1200M 4000 feet typical Use of a signal repeater can extend transmission distances beyond this limit Character Size Software programmable 5 8 bits ag Software Programmable odd even or no parity Stop uuu nem Software programmable 1 1 1 2 or 2 bits Data Register Buffers The data registers are double buffered 160450 mode or 16 byte FIFO buffered FIFO mode Interrupts
35. Stats Register oB Not Driven Port A Line Status Register R W MSR Not Driven Port A Modem Status Register R W SCR Port A Scratch Pad Interrupt Vector Register Shaded register entries apply to Model IP501 64 units only and are accessible after writing BF to the Line Control Register LCR SERIES IP501 INDUSTRIAL I O PACK EIA TIA 422B SERIAL COMMUNICATION MODULE Table 3 1 IP501 Space Memory Map continued Serial Port B Registers Base MSB LSB LC Base Bit7 READ RBR Not Driven Port B Receiver ELI JD Buffer Register WRITE THR Port B Transmitter Holding Register R W DLL Not Driven Port B Divisor Latch 1 LSB R W IER Not Driven Port B Interrupt Enable Register R W DLM Not Driven Port B Divisor Latch MSB R W Not Driven Port B Enhanced Function Register 64 models only R W XON 1 Word Not Driven Port B SW Flow Control R W XON 2 Word Not Driven Port B SW Flow Control 1C R W XOFF 1 Word 1 Not Driven Port B SW Flow Control R W XOFF 2 Word 1 Not Driven Port B SW Flow Control Base MSB LSB Base READ IIR Not Driven Port B Interrupt Identification Register WRITE FCR Not Driven Port B FIFO Control Register R W LCR Not Driven Port B Line Control Register 17 R W MCR Not Driven Port B Modem Control Register Noten Port Line Status Register 18 Not Driven Port B Line Status Register 1C R W MSR No
36. a host CPU read of the LSR In FIFO mode this bit is set when the Tx FIFO is empty and cleared when one byte is written to the Tx FIFO When a Transmitter Holding Register Empty interrupt is enabled by IER bit 1 this signal causes a priority 3 interrupt in the IIR If the IIR indicates that this signal is causing the interrupt the interrupt is cleared by a read of the IIR Transmitter Not Empty Empty Transmitter Empty set when TEMT both the Transmitter Holding Register THR and the Transmitter Shift Register TSR are both empty Reset low when a character is loaded into the THR and remains low until the character is transmitted it is not reset low by a read of the LSR In FIFO mode this bit is set when both the transmitter FIFO and shift register are empty Interrupt Bl SERIES IP501 INDUSTRIAL I O PACK EIA TIA 422B SERIAL COMMUNICATION MODULE Line Status Register continued 0 No Error in FIFO it is always 0 in the 16C450 mode FCR bit 0 low 1 Error in FIFO set when one of the following data errors is present in Receiver FIFO Error the FIFO parity error framing error or break interrupt indication Cleared by a host CPU read of the LSR if there are no subsequent errors in the FIFO Note that LSR Bits 1 4 OE PE FE Bl are the error conditions that produce a receiver line status interrupt a priority 1 interrupt in the IIR register when any one of these conditions are detected This i
37. ads the contents of the LSR In the FIFO mode the parity error is associated with a particular character in the FIFO LSR Bit 2 reflects the error when the char acter is at the top of the FIFO Line Status Register continued Framing Error 0 No Error FE 1 Framing Error Indicates that the received character does not have a valid stop bit stop bit following last data bit or parity bit detected as a zero space bit This bit is reset low when the CPU reads the contents of the LSR In FIFO mode the framing error is associated with a particular character in the FIFO LSR Bit 3 reflects the error when the character is at the top of the FIFO No Break Break the received data input has been held in the space logic 0 state for more than a full word transmission time start bits data parity bit stop bits Reset upon read of LSR In FIFO mode this bit is associated with a particular character in the FIFO and reflects the Break Interrupt when the break character is at the top of the FIFO It is detected by the host CPU during the first LSR read Only one 0 character is loaded into the FIFO when BI OCCUIS Transmitter Not Empty Holding Empty indicates that the Register channel is ready to accept a new Empty character for transmission Set THRE high when character is trans ferred from the THR into the transmitter shift register Reset low by loading the THR It is not reset by
38. and parity in mind for an asynchronous data byte note that at least one bit will be a 1 the stop bit This defines the break signal all O bits with a 1 stop bit lasting longer than one character A break signal is a transfer from mark to space that lasts longer than the time it takes to transfer one character Because the break signal doesn t contain any logical 1 s it cannot be mistaken for data Typically whenever a break signal is detected the receiver will interpret whatever follows as a command rather than data The break signal is used whenever normal signal processing must be interrupted In the case of a modem it will usually precede a modem control command Do not confuse the break signal with the ASCII Null character since a break signal is longer than one character time That is it is any space condition on the line that lasts longer than a single character including its framing bits and is usually 1 1 2 to 2 character times long The baud rate is a unit of transmission speed equal to the number of electrical signals signal level changes sent on a line in one second It is thus the electrical signaling rate or frequency at which electrical impulses are transmitted on a communication line The baud rate is commonly confused with the bit transfer rate bits per second but baud rate does not equate to the number of bits transmitted per second unless one bit is sent per electrical signal However one electrical signal
39. ays register to control the transmitter enables for the port A power up or system reset sets MSR bit 0 to 0 bit 4 is determined by input signal Unused bits are always clear SCR Scratch Pad Interrupt Pointer Register Ports A D R W This 8 bit read write register has no effect on the operation of either serial channel It is provided as an aide to the programmer to temporarily hold data Alternately if interrupt generation is desired then this port is used to store the interrupt vector for the port In response to an interrupt select cycle the IP module will execute a read of this register for the interrupting port see Interrupt Generation section for more details TEA Transmit Enable Always Register R W The lower four bits of this register Bits 0 3 are used to permanently enable the transmitters the line drivers for TxD and RTS of a port Normally these data paths are enabled via an asserted Request to Send RTS signal but may be permanently enabled by setting the respective bit in this register high Bit 0 controls port A bit 1port B bit 2 port C and bit 3 port D Do not use this in conjunction with hardware flow control A power up or system reset clears bits 0 3 The upper four bits of this register are not used and will always read high 1 s IP Identification PROM Read Only 32 Odd Byte Addresses Each IP module contains an identification ID PROM that resides in the ID space per the IP module specif
40. baud generator RCLK is sixteen times the baud rate Two 8 bit divisor latch registers per port are used to store the divisors in 16 bit binary format The DLL register stores the low order byte of the divisor DLM stores the high order byte These registers must be loaded during initialization Note that bit 7 of the LCR register must first be set high to access the divisor latch registers DLL amp DLM during a read write operation Upon loading either latch a 16 bit baud counter is immediately loaded this prevents long counts on initial load The clock may be divided by any divisor from 1 to 24193 The output frequency of the baud rate generator RCLK is 16x the data rate The relationship between the output of the baud generator RCLK the baud rate the divisor and the 8MHz system clock can be summarized in the following equations DIVISOR CLOCK FREQUENCY BAUD RATE x 16 RCLK 16 x BAUD RATE 16 x CLOCK 16 x DIVISOR CLOCK DIVISOR The following table shows the correct divisor to use for generation of some standard baud rates based on the 8MHz clock Note that baud rates up to 512K may be configured Provisions for installation of an external crystal has been provided on the circuit board 16MHz With a 16MHz crystal a 1Mbps baud rate is possible you may contact Acromag Applications Engineering to explore options in this area With respect to this device the baud rate may be considered equal to the numb
41. carrier boards are supported see Acromag Model APC8600 A wide range of other Acromag IP modules are also available to serve your signal conditioning and interface needs Note Since all connections to field signals are made through the carrier board which passes them to the individual IP modules you should consult the documentation of your carrier board to ensure compatibility with the following interface products Cables Model 5025 551 X Shielded Cable or Model 5025 550 X Non Shielded Cable A Flat 50 pin cable with female connectors at both ends for connecting AVME9630 9660 APC8610 or other compatible carrier boards to Model 5025 552 termination panels The unshielded cable is recommended for digital I O while the shielded cable is recommended for optimum performance with precision analog I O applications The suffix of the model is used to specify the required length in feet Model 5029 943 IP500 Serial Communication Cable A 5 foot long flat 50 pin cable with a female connector on one end for connection to AVME9630 9660 or other compatible carrier boards and four DE 9P connectors serial ports on the other end Also used for interface with Acromag Model IP501 RS 422 amp IP502 RS 485 serial communication modules Termination Panels Model 5025 552 A DIN rail mountable panel that provides 50 screw terminals for universal field I O termination Connects to Acromag AVME9630 9660 APC8610 or other compatib
42. complete repair services are also available from Acromag 6 0 SPECIFICATIONS GENERAL SPECIFICATIONS VART ole uos ee Texas Instruments TL16C554FN or Startech ST16C554DCJ68 IP501 16 Startech ST16C554D1J68 IP501 16E Startech ST16C654CJ68 IP501 64 Operating Temperature 0 to 70 C IP501 16 IP501 64 40 C to 85 C IP501 16E Relative Humidity 5 95 non condensing Storage Temperature 40 C to 125 C Physical Configuration Single Industrial Pack Module Length edes 3 880 inches 98 5 mm uu 1 780 inches 45 2 mm 0 062 inches 1 59 mm Max Component Height 0 314 inches 7 97 mm Connectors P1 IP Logic Interface 50 pin female receptacle header AMP 173279 3 or equivalent P2 Field l O 50 pin female receptacle header AMP 173279 3 or equivalent Power 5 Volts 5596 uus 300mA Typical with transmitter terminating resistors removed 535mA Typical with all Termination amp Bias Resistors installed 650mA Maximum 12 Volts 5 from 1 OmA Not Used 12 Volts 5 from P1 OmA Not Used Non Isolated Logic and field commons have a direct electrical connection Resistance to No data upsets occur for field strengths up to 10V per meter at 27MHz 151MHz amp 460MHz per
43. ctive by writing a 1 to the Modem Control Register Normally this signal has no effect on the transmit or receive operation unless hardware flow control is enabled Likewise on this model the RTS signal is also used to enable the transmitters of the channel TxD amp RTS when the corresponding Transmit Enable Always Register TEA bit is set to 0 Clear to Send Input Turned on by the receiving device to indicate it is ready to receive data The input status of this signal can be read via bit 4 of the Modem Status Register CTS has no effect on the transmit or receive operation unless hardware flow control is enabled On this model the DTR bit of the Modem Control Register is used to enable the CTS amp RxD receiver Note that not all UART signal paths are used by this model and their corresponding UART pins are tied high 5V This includes RI Ring Indicator DSR Data Set Ready and DCD Data Carrier Detect In addition the UART DTR Data Terminal Ready signal path is used to control the receiver enables for the port The RTS signal is used in combination with the TEA Transmit Enable Always register to control the transmitter enables for the port Noise and Grounding Considerations The serial channels of this module are non isolated and share a common signal ground connection Further the IP501 is non isolated between the logic and field I O grounds since signal common is electrically connected to the IP module gro
44. d to enable the RxD and CTS receivers of the port Additionally asserting the RTS bit will enable the TxD and RTS transmitters of the port if the corresponding Transmit Enable Always Register TEA bit is not set A power up or system reset sets all MCR bits to 0 bits 5 7 are permanently low on standard units Modem Control Register Data Terminal 0 DTR Not Asserted Inactive Ready Output 1 DTR Asserted Active Signal DTR A DTR signal path is NOT SUPPORTED by this model Instead this output is used to enable the receivers of the port RxD amp CTS receivers 0 RTS Not Asserted Inactive 1 2 RTS Asserted Active Request to Send Output E E gt gt gt Out2 0 External Serial Channel Interrupt Disabled 1 External Serial Channel Interrupt Enabled Loop 1 Loop Enabled 5 6 7 Not Used on Bits are set to logic 0 IP501 16 Units Extended Register Functionality Model IP501 64 Only 5 XON Enable 0 Disable Any XON function Standard 16C550 Mode 1 Enable Any XON function Clock Divide 0 Normal divide by 1 clock 8MHz clock baud rates apply 1 Divide clock by 4 2MHz baud rates apply Notes Modem Control Register 1 MCR Bit 4 provides a local loopback feature for diagnostic testing of the UART channel When set high the UART serial output connected to the TXD driver is set to the marking logic 1 state and the UART receiver serial input is disconnected fr
45. data interface A description of the basic functionality of the circuitry used on the board is also provided Refer to Block Diagram Drawing 4501 553 Interface Diagram Drawing 4501 554 and Interface Levels Drawing 4501 570 as you review this material EIA TIA 422B SERIAL INTERFACE The Electronic Industries Association EIA in conjunction with the Telecommunication Industries Association TIA introduced TIA EIA 422B as a balanced differential serial data transmission interface standard between Data Terminal Equipment DTE and Data Communication Equipment DCE By definition DTE is commonly used to represent the data source data sink or both DCE is used to represent the devices used to establish maintain and terminate a connection and to code decode the signals between the DTE and the transmission channel Most computers are considered DTE devices while modems are DCE devices The EIA TIA 422B interface is the second revision of this standard and specifies a balanced driver with balanced receivers Balanced data transmission refers to the fact that two conductors are switched per signal and the logical state of the data is referenced by the difference in potential between the two conductors not with respect to signal ground The differential method of data transmission makes EIA 422B ideal for noisy environments since it minimizes the effects of coupled noise and ground potential differences That is since these effects are
46. e the center of each successive data cell will occur within 3 125 of the actual center this is 50 16 providing an error margin of 46 875 Thus the start bit can begin as much as one 16x clock cycle prior to being detected EFR Enhanced Function Register Ports A D R W Model IP501 64 Only The enhanced features of the Model IP501 64 can be enabled disabled via this register This register is also used to unlock access to programming the extended register functionality of IER bits 4 7 IIR bits 4 5 FCR bits 4 5 and MCR bits 5 7 It is also used to program hardware or software flow control Note that bits 6 amp 7 are used for hardware flow control SERIES IP501 INDUSTRIAL I O PACK EIA TIA 422B SERIAL COMMUNICATION MODULE Enhanced Function Register EFR KS Allows combinations of software flow control to be programmed see table below Enhanced Functions Enable bit 0 disable enhanced functions controlled via IER bits 4 7 IIR bits 4 5 FCR bits 4 5 and MCR bits 5 7 Note that after reset these bits are set to 0 to manintain compatibility with the 16C550 standard functionality mode 1 Enable all enhanced features Allows IER bits 4 7 IIR bits 4 5 FCR bits 4 5 and MCR bits 5 7 to be modified Then after modification EFR bit 4 can be set to 0 to latch the contents and prevent existing software from overwriting the enhanced functionality provided by these bits 0 Normal 1 Enable Specia
47. er of bits transmitted per second bps The bit rate bps or baud rate defines the bit time This is the length of time a bit will be held on before the next bit is transmitted A receiver and transmitter must be communicating at the same bit rate or data will be garbled A receiver is alerted to an incoming character by the start bit which marks the beginning of the character It then times the incoming signal sampling each bit as near to the center of the bit time as possible Table 3 2 Baud Rate Divisors and Relative Error 8MHz Clk BAUD RATE DIVISOR N ERROR DIFF BET DESIRED USED FOR 16x DESIRED amp ACTUAL CLOCK 50 10000 2710H 600 833 0341H 0040 200 250 OOFAH 0 7200 69 00 0644 5600 9 ooo9 H 070 To better understand the asynchronous timing used by this device note that the receive data line RxD is monitored for a high to low transition start bit When the start bit is detected a counter is reset and counts the 16x sampling clock to 7 1 2 which is the center of the start bit The receiver then counts from 0 to 15 to sample the next bit near its center and so on until a stop bit is detected signaling the end of the data stream Use of a sampling rate 16x the baud rate reduces the synchronization error that builds up in estimating the center of each successive bit following the start bit As such if the data on RxD is a symmetrical square wav
48. er will require the use of odd address locations Note that some functions share the same register address For these items the address lines are used along with the divisor latch access bit bit 7 of the Line Control Register and or the read and write signals to determine the function required The enhanced feature registers of Model IP501 64 are shaded in the table that follows and only accessible after writing BF to the Line Control Register LCR Table 3 1 IP501 I O Space Address Hex Memory Map Base MSB LSB LCR Base Addr D15 D08 007 Bit7 Addr Serial Port A Registers BE Port A Transmitter Holding Register R W DLL Not Driven Port A Divisor Latch LSB R W IER Not Driven Port A Interrupt Enable Register R W DLM Not Driven Port A Divisor Latch MSB Not Driven Port A Enhanced Function Register 64 models only R W XON 1 Word Not Driven Port A SW Flow Control R W XON 2 Word 1 Not Driven Port A SW Flow Control READ RBR Port A Receiver Buffer Register WRITE THR R W XOFF 1 Word 1 Not Driven Port A SW Flow Control R W XOFF 2 Word 1 Not Driven Port A SW Flow Control Addr D15 008 D07 D00 Addr READ IIR Not Driven Port A Interrupt Identification Register WRITE FCR Not Driven Port A FIFO Control Register R W LCR Not Driven Port A Line Control Register 07 R W MCR Port A Modem Control Not Driven Register Noten Pon Line
49. field I O signals to the Industrial I O Pack IP Termination Panel Acromag Part 4001 040 Phoenix Contact Type FLKM 50 The 5025 552 termination panel facilitates the connection of up to 50 field I O signals and connects to the AVME9630 9660 3U 6U or APC8610 non intelligent carrier boards A D connectors only via a flat ribbon cable Model 5025 550 x or 5025 551 x The A D connectors on the carrier board connect the field I O signals to the P2 connector on each of the Industrial Pack modules Field signals are accessed via screw terminal strips The terminal strip markings on the termination panel 1 50 correspond to P2 pins 1 50 on the Industrial I O Pack IP Each Industrial I O Pack IP has its own unique P2 pin assignments Refer to the IP module manual for correct wiring connections to the termination panel Schematic and Physical Attributes See Drawing 4501 464 Field Wiring 50 position terminal blocks with screw clamps Wire range 12 to 26 AWG Connections to AVME9630 9660 or APC8610 P1 50 pin male header with strain relief ejectors Use Acromag 5025 550 x or 5025 551 x cable to connect panel to VME board Keep cable as short as possible to reduce noise and power loss Mounting Termination panel is snapped on the DIN mounting rail Printed Circuit Board Military grade FR 4 epoxy glass circuit board 0 063 inches thick Operating Temperature 40 C to 100 C Storage Temperature 40 C to 100 C Shipping We
50. his model and their corresponding UART pins are tied high 5V This includes RI Ring Indicator DSR Data Set Ready and DCD Data Carrier Detect In addition the UART DTR Data Terminal Ready signal path is used to control the receiver enables for the port The RTS signal is used in combination with the TEA Transmit Enable Always register to control the transmitter enables for the port EIA TIA 422B Signal Descriptions Receive Data Path DCE to DTE This is the receive data path from the remote receiver to the host transmitter The signals on these lines are in serial form When DCD is held off this line is held in the mark state Transmit Data Path DTE to DCE This is the transmit data path from the DTE to the modem When no data is being transmitted the signal path is held in the mark state Normally for data to be transmitted DSR DTR RTS and CTS must all be in the on state asserted A DSR data path is not provided by this model Additionally a DTR data path is not available and this output signal is instead used to enable the RxD and CTS receivers of the port Request to Send DTE to DCE RTS is turned on by the DTE to tell the DCE it is ready to transmit data This is also passed to the remote DCE The DCE will turn CTS on in response to tell the DTE it is ready to receive data As such RTS acts to control the direction of data transmission It is turned ON in transmit mode and turned OFF when transmissi
51. ication This area of memory contains 32 bytes of information at most Both fixed and variable information may be present within the ID PROM Fixed information includes the IPAC identifier model number and manufacturer s identification codes Variable information includes unique information required for the module The IP501 ID PROM does not contain any variable e g unique calibration information ID PROM bytes are addressed using only the odd addresses in a 64 byte block on the Big Endian VMEbus Even addresses are used on the Little Endian PC ISA bus 14 SERIES IP501 INDUSTRIAL I O PACK EIA TIA 422B SERIAL COMMUNICATION MODULE The IP501 ID PROM contents are shown in Table 3 2 Note that the base address for the IP module ID space see your carrier board instructions must be added to the addresses shown to properly access the ID PROM Execution of an ID PROM Read requires 1 wait state Table 3 2 IP501 ID Space Identification ID PROM Hex Offset From ID PROM Base Address ASCII Character Equivalen Numeric Value Hex Field Description All IP s have IPAC A Acrromag 0 Code 95 IP Model Code Not Used Revision OF 00 Reseved ID Low Byte ID High Byte L5 ID PROM Bytes F p cC i9to3F w Noused Notes Table 3 2 1 The IP model number is represented by a two digit code within the ID PROM IP501 models are represented by
52. ight 1 25 pounds 0 6kg packaged 23 SERIES IP501 INDUSTRIAL PACK EIA TIA 422B SERIAL COMMUNICATION MODULE TRANSITION MODULE MODEL TRANS GP Type Transition module for AVME9630 9660 boards Application To repeat field I O signals of IP modules A through D for rear exit from VME card cages This module is available for use in card cages which provide rear exit for I O connections via transition modules transition modules can only be used in card cages specifically designed for them It is a double height 6U single slot module with front panel hardware adhering to the VMEbus mechanical dimensions except for shorter printed circuit board depth Connects to Acromag termination panel 5025 552 from the rear of the card cage and to AVME9630 9660 boards within card cage via flat 50 pin ribbon cable cable Model 5025 550 X or 5025 551 X Schematic and Physical Attributes See Drawing 4501 465 Field Wiring 100 pin header male connectors 3M 3433 D303 or equivalent employing long ejector latches and 30 micron gold in the mating area per MIL G 45204 Type Grade C Connects to Acromag termination panel 5025 552 from the rear of the card cage via flat 50 pin ribbon cable cable Model 5025 550 X or 5025 551 X Connections to AVME9630 9660 50 pin header male connectors 8M 3433 1302 or equivalent employing long ejector latches and 30 micron gold in the mating area per MIL G 45204 Type Il Grade C Connects to
53. ines for the RTS driver and CTS receiver of the IP501 are flipped to provide the inversion required by the UART for these handshake lines The line receivers convert the interface signals to the conventional TTL level associations required by the UART The line drivers convert the TTL signals of the UART to the differential voltages required at the interface Refer to Drawing 4501 570 BINARY 0 BINARY 1 EIA TIA 422B SPACE ON MARK OFF SIGNAL A to B Negative Positive to Differential Voltage Differential Voltage Start and stop bits are used to synchronize the receiver DCE to the asynchronous serial data of the transmitter DTE The transmit data line is normally held in the mark state logical 1 The transmission of a data byte requires that a start bit a logical 0 or a transition from mark to space be sent first This tells the receiver that the next bit is a data bit The data bits are followed by a stop bit a logical 1 or a return to the mark state The stop bit tells the receiver that a complete byte has been received Thus 10 bits make up a data byte if the data character is 8 bits long and no parity is assumed Nine bits are required if only standard ASCII data is being transmitted 1 start bit 7 data bits 1 stop bit The character size for this module is programmable from 5 to 8 bits Parity is a method of judging the integrity of the data Odd even or no parity may be configured for this module If parity i
54. interrupt is cleared and the timer is reset when the CPU reads a character from the receiver FIFO When the transmit FIFO and transmit interrupts are enabled FCR Bit 0 1 and IER 01 a transmitter interrupt will occur as follows 1 When the transmitter FIFO is empty the transmitter holding register interrupt IIR 02 occurs The interrupt is cleared when the Transmitter Holding Register THR is written to or the Interrupt Identification Register IIR is read One to sixteen characters can be written to the transmit FIFO when servicing this interrupt 2 The transmit FIFO empty indications are delayed one character time minus the last stop bit time when the following occurs Bit 5 of the LSR THRE is 1 and there is not a minimum of two bytes at the same time in the transmit FIFO since the last time THRE 1 The first transmitter interrupt after changing FCR Bit 0 is immediate assuming it is enabled The receiver FIFO trigger level and character time out interrupts have the same priority as the received data available interrupt The Transmitter Holding Register Empty interrupt has the same priority as the Transmitter FIFO Empty interrupt 16 SERIES IP501 INDUSTRIAL I O PACK EIA TIA 422B SERIAL COMMUNICATION MODULE Loopback Mode Operation This device can be operated a loopback mode useful for troubleshooting a serial channel without physically wiring to the channel Bit 4 of the Modem Control Register MCR
55. is used to program the local loopback feature for the UART channel When set high the UART channel s serial output line Transmit Data Path is set to the marking logic 1 state and the UART receiver serial data input lines are disconnected from the RxD receiver path The output of the UART transmitter shift register is then looped back into the receiver shift register input Thus a write to the Transmitter Holding Register is automatically looped back to the corresponding Receiver Buffer Register Additionally the four modem control inputs CTS DSR DCD and RI are disconnected from their receiver input paths With modem status interrupts enabled in the Loopback Mode the CTS DSR RI and DCD inputs are ignored Instead the four modem control outputs RTS OUT1 and OUT2 of the MCR Register are internally connected to the corresponding four modem control inputs monitored via the Modem Status Register while their associated pins are forced to their high inactive state Thus in the loopback diagnostic mode transmitted data is immediately received permitting the host processor to verify the transmit and receive data paths of the selected serial channel Further modem status interrupt generation is controlled manually in loopback mode by controlling the state of the four lower order MCR bits internally instead of by the external hardware paths However in loopback mode no interrupt requests or interrupt vectors will actuall
56. ister to the receiver FIFO It is reset to 0 when the FIFO is empty 2 The receiver line status interrupt IIR 06 has a higher priority than the received data available interrupt IIR 04 3 The receive data available interrupt is issued to the CPU when the programmed trigger level is reached by the FIFO It is cleared when the FIFO drops below its programmed trigger level The receive data available interrupt indication IIR 04 also occurs when the FIFO reaches its trigger level and is cleared when the FIFO drops below its trigger level When the receiver FIFO and receiver interrupts are enabled the following receiver FIFO character time out status conditions apply 1 AFIFO character time out interrupt occurs if A minimum of one character is in the FIFO e The last received serial character is longer than four continuous prior character times ago if 2 stop bits are programmed the second one is included in the time delay e The last CPU read of the FIFO is more than four continuous character times earlier At 300 baud and with 12 bit characters the FIFO time out interrupt causes a latency of 160ms maximum from received character to interrupt issued 2 From the clock signal input the character times can be calculated The delay is proportional to the baud rate 3 The time out timer is reset after the CPU reads the receiver FIFO or after a new character is received when there has been no time out interrupt 4 Atime out
57. its only and are accessible after writing BF to the Line Control Register LCR SERIES IP501 INDUSTRIAL I O PACK EIA TIA 422B SERIAL COMMUNICATION MODULE Table 3 1 IP501 Space Memory Map continued Serial Port D Registers Base MSB LSB LC Base Addr D15 D08 D07 D00 R Addr Bit7 READ RBR Not Driven Port D Receiver Buffer Register WRITE THR Not Driven Port D Transmitter Holding Register R W DLL Port D Divisor Latch SW Flow Control R W XOFF 2 Word LSB R W IER Port D Interrupt Enable Register R W DLM Port D Divisor Latch MSB R W Port D Enhanced Function Register 64 models only R W XON 1 Word Port D SW Flow Control R W XON 2 Word 1 Port D SW Flow Control 3C R W XOFF 1 Word 1 Not Driven Port D ML SW Flow Control Base MSB LSB Base READ IIR Not Driven Port D Interrupt Identification Register WRITE FCR mia Register R W LCR ru Not Driven Port D Line Control Register 37 R W MCR Not Driven Port D Modem Control Register Pon p Line Status Register 3B Not Driven Port D Line Status Register 3C R W MSR Not Driven Port D Modem Status Register R W SCR Not Driven Port D Scratch Pad Interrupt Vector Register R W TEA Not Driven Transmit Enable Always Register 42 43 NOT USED 7E 7F Shaded register entries apply to Model IP501 64 units only and are accessible after w
58. l Character Detect If enabled the UART will compare the received data with the XOFF 2 data Upon a correct match the received data will be transferred to the FIFO and IIR bit 4 will be set to indicate the detection of the special character Auto RTS Hardware RTS flow Control Enable 0 Normal RTS flow control disabled 1 Enable RTS pin to go high deasserted when the receive FIFO has reached its programmed trigger level Auto CTS Hardware CTS flow Control Enable 0 Normal CTS flow control disabled 1 Resume transmission when a low input signal CTS asserted is detected on the CTS pin Under software flow control different conditions can be set to detect XON XOFF characters in the data stream or start stop transmission The following table lists all the possible conditions Software Flow Control Via EFR Bits 0 3 Bit2 Bit Bito Tx Rx Software Flow Controls 0 0 X X No Transmit Flow Control 1 Jo X X Transmit X Transmit XOFF2 XOFF1 XOFF2 o 0 No Receive Flow Control Transmit XON1 XOFF1 Receiver Compares XON1 or XON2 XOFF1 or XOFF2 1 Transmit XON2 XOFF2 Receiver Compares XON1 XON2 1 1 Transmit XON1 amp XON2 XOFF1 amp XOFF2 Receiver Compares XON1 amp XON2 XOFF1 amp XOFF2 1 No Transmit Flow Control Receiver Compares XON1 amp XON2 XOFF1 and XOFF2 LO E 1 or XOFF2 1
59. le carrier boards via flat 50 pin ribbon cable Model 5025 550 X or 5025 551 X Transition Module Model TRANS GP This module repeats field I O connections of IP modules A through D for rear exit from a VMEbus card cage It is available for use in card cages which provide rear exit for I O connections via transition modules transition modules can only be used in card cages specifically designed for them Itis a double height 6U single slot module with front panel hardware adhering to the VMEbus mechanical dimensions except for shorter printed circuit board depth It connects to Acromag Termination Panel 5025 552 from the rear of the card cage and to AVME9630 9660 boards within the card cage via flat 50 pin ribbon cable cable Model 5025 550 or 5025 551 INDUSTRIAL I O PACK SOFTWARE LIBRARY Acromag provides an Industrial I O Pack Software Library diskette Model IPSW LIB M03 MSDOS format to simplify communication with the board Example software functions are provided for both ISAbus PC AT and VMEbus applications All functions are written in the C programming language and can be linked to your application For more details refer to the README TXT file in the root directory on the diskette and the INFO501 TXT file in the appropriate IP501 subdirectory off of VMEIP or PCIP according to your carrier 2 0 PREPARATION FOR USE UNPACKING AND INSPECTION Upon receipt of this product inspect the shipping ca
60. lly asserting the RTS bit will enable the TxD and RTS transmitters of the port if the corresponding Transmit Enable Always Register TEA bit is not set The Scratchpad Register is used to store the interrupt vector for the port In response to an interrupt select cycle the IP module will provide a read of this port As such each port may have a unique interrupt vector assigned Interrupts are served in a shifting priority fashion that is a function of the last interrupting port serviced This prevents continuous interrupts from one channel from freezing out service of another interrupting channel This board operates in two different modes In one mode this device remains software compatible with the industry standard 16C450 family of UART s and provides double buffering of data registers In the FIFO Mode enabled via bit 0 of the FCR register data registers are FIFO buffered so that read and write operations can be performed while the UART is performing serial to parallel and parallel to serial conversions Two FIFO modes of operation are possible FIFO Interrupt Mode and FIFO Polled Mode In FIFO Interrupt Mode data transfer is initiated by reaching a pre determined trigger level or generating time out conditions In FIFO Polled Mode there is no time out condition indicated or trigger level reached The transmit and receive FIFO s simply hold characters and the Line Status Register must be read to determine the channel status Acro
61. mag provides an Industrial I O Pack Software Library diskette Model IPSW LIB M03 MSDOS format to simplify communication with the board Example software functions are provided for both ISA bus PC AT and VMEbus applications All functions are written in the C programming language and can be linked to your application For more details refer to the README TXT file in the root directory the diskette and the INFO501 TXT file in the appropriate IP501 subdirectory off of VMEIP or PCIP according to your carrier FIFO Polled Mode Resetting Interrupt Enable Register Bit 0 Bit 1 Bit 2 Bit 3 or all four to 0 with FIFO Control Register FCR Bit 0 1 puts the channel into the polled mode of operation The receiver and transmitter are controlled separately and either one or both may be in the polled mode In FIFO Polled Mode there is no time out condition indicated or trigger level reached the transmit and the receive FIFO s simply hold characters and the Line Status Register must be read to determine the channel status FIFO Interrupt Mode In FIFO Interrupt Mode data transfer is initiated by reaching a pre determined trigger level or generating a time out condition Please note the following with respect to this mode of operation When the receiver FIFO and receiver interrupts are enabled the following receiver status conditions apply 1 LSR Bit 0 is set to 1 when a character is transferred from the shift reg
62. med in the Line Control Register LCR bits 0 amp 1 If less than 8 bits are transmitted then data is right justified to the LSB If parity is used then LCR bit 3 parity enable and LCR bit 4 type of parity are required Status for the receiver is provided via the Line Status Register LSR When a full character is received including parity and stop bits the data received indication bit bit 0 of the LSR is set to 1 The host CPU then reads the Receiver Buffer Register which resets LSR bit 0 low If the character is not read prior to a new character transfer between the receiver shift register and the receiver buffer register the overrun error status indication is set in LSR bit 1 If there is a parity error the error is indicated in LSR bit 2 If a stop bit is not detected a framing error indication is set in bit 3 of the LSR Serial asynchronous data is input to the receiver shift register via the receive data line RxD From the idle state this line is monitored for a high to low transition start bit When the start bit is detected a counter is reset and counts the 16x clock to 7 1 2 which is the center of the start bit The start bit is judged valid if RxD is still low at this point This is known as false start bit detection By verifying the start bit in this manner it helps to prevent the receiver from assembling an invalid data character due to a low going noise spike on RxD If the data on RxD is a symmetrical square wa
63. nal error cases such as parity or overrun errors The modem status interrupts are expected but the line status interrupts are not The received data available and transmit holding buffer empty interrupts have also been enabled to aide control by the host CPU in moving data back and forth Write C7H to the FIFO Control Register FCR This enables and initializes the transmit and receive FIFO s and sets the trigger level of the receive FIFO interrupt to 14 bytes Read C1H from the Interrupt Identification Register IIR This is done to check that the device has been programmed correctly The upper nibble C indicates that the FIFO s have been enabled and the lower nibble 1 indicates that no interrupts are pending Write 02H to the Modem Control Register MCR This sets the Request To Send bit and asserts the RTS signal line It is used to signal a receiver that the device is ready to transmit some data Note the modem control lines either input or output have no effect on the parallel to serial output data or serial to parallel input data These lines interact only through CPU control to provide the handshaking necessary for this data transfer protocol Read 11H from the Modem Status Register MSR This is an indication from the receiver that the Clear To Send signal has been asserted and that there has been a change in the CTS signal since the last read of the MSR Consequently an interrupt will be generated on INT
64. nse to the Transmitter Holding Register Empty THRE status indication Set the break in response to the next THRE status indication Wait for the transmitter to become idle when the Transmitter Empty status signal is set high TEMT 1 then clear the break when normal transmission has to be restored Divisor 0 Access Receiver Buffer Latch 1 Allow Access to Divisor Latches MEE Bit Note that writing BF to this register allows access to the enhanced register functionality of IP501 64 models Note that bit 7 must be set high to access the divisor latch registers of the baud rate generator DLL amp DLM during a read write operation Bit 7 must be low to access the Receiver Buffer register RBR the Transmitter Holding Register THR or the Interrupt Enable Register IER A power up or system reset sets all LCR bits to 0 A detailed discussion of word length stop bits parity and the break signal is included in Section 4 0 Theory of Operation 12 MCR Modem Control Register Ports A D R W The Modem Control register controls the interface with the modem or data set as described below For this model only the RTS and CTS handshake lines are supported and DTR is used to enable the receivers The RTS output is directly controlled by its control bit in this register a high input asserts these signals A DTR data path is not provided by this model and this output signal via this register bit 0 is instead use
65. nterrupt is enabled by setting IER bit 2 to 1 A power up or system reset sets all LSR bits to 0 except bits 5 and 6 which are high MSR Modem Status Register Ports A D Read Write The Modem Status Register MSR provides the host CPU with an indication on the status of the modem input lines from a modem or other peripheral device This model only provides support for the CTS and RTS handshake lines As such this register allows the current state of CTS to be read bit 4 and provides indication on whether the state of this line has changed since the last read of the MSR bit 0 set high when the corresponding control input from the modem changes state and reset low when the CPU reads the MSR Modem Status Register ACTS Set if CTS has changed states since last read of MSR ADSR NOT SUPPORTED ARI NOT SUPPORTED ADCD NOT SUPPORTED 3 4 CTS This bit is the complement of the CTS input from the modem indicating that the modem is ready to receive data This bit is equivalent to RTS in the MCR during local loopback mode If the channel is in the loopback mode MCR bit 4 1 then the state of RTS in the MCR is reflected CTS functions as a hardware flow control signal input if it is enabled via EFR bit 7 The transmit holding register is gated with this input to start stop the transmission A high at this pin will stop the transmission as soon as a complete character has been transmitted DSR NOT SUPPORTED This
66. om inadvertently overwriting the extended functions A power up or system reset sets all MCR bits to 0 LSR Line Status Register Ports A D Read Write Restricted The Line Status Register LSR provides status indication corresponding to the data transfer LSR bits 1 4 are the error conditions that produce receiver line status interrupts a priority 1 interrupt in the Interrupt Identification Register The line status register may be written but this is intended for factory test and should be considered read only by the applications software Line Status Register Data Ready 0 Not Ready reset low by CPU DR Read of RBR or FIFO 1 Data Ready set high when character received and trans ferred into the RBR or FIFO Overrun Error 0 No Error OE 1 Indicates that data in the RBR is not being read before the next character is transferred into the RBR overwriting the previous character In the FIFO mode it is Set after the FIFO is filled and the next character is received The overrun error is detected by the CPU on the first LSR read after it happens The character in the shift register is not transferred into the FIFO but is overwritten This bit is reset low when the CPU reads the LSR Parity Error No Error PE Parity Error the received character does not have the correct parity as configured via LCR bits 3 amp 4 This bit is set high on detection of a parity error and reset low when the host CPU re
67. om the RxD receiver path The output of the UART transmitter shift register is looped back into the receiver shift register input The four modem control inputs CTS DSR DCD amp RI are disconnected from their receiver input paths The four modem control outputs DTR RTS OUT1 amp OUT2 are internally connected to the four modem control inputs while their associated pins are forced to their high inactive state 4 Bits 5 7 are only programmable when the EFR bit 4 is set to 1 The programmed values for these bits are latched when EFR SERIES IP501 INDUSTRIAL I O PACK EIA TIA 422B SERIAL COMMUNICATION MODULE bit 4 is cleared preventing existing software from inadvertently overwriting the extended functions However these MCR bits cannot be set if the LCR is set to BF hex Thus in Loopback Mode transmitted data is immediately received permitting the host processor to verify the transmit and receive data paths of the selected serial channel In Loopback Mode interrupts are generated by controlling the state of the four lower order MCR bits internally instead of by the external hardware paths However no interrupt requests or interrupt vectors are served and interrupt pending status is only reflected internally Note that on Model IP501 64 units bits 5 7 are programmable only when the EFR bit 4 is set to 1 The programmed values for these bits are latched when EFR bit 4 is cleared preventing existing software fr
68. on is completed or in receive mode the DCE will turn CTS off in response Clear to Send DCE to DTE CTS is turned on by the DCE to indicate it is ready to receive data from the DTE and the local modem has control over the telephone line CTS is turned on in response to simultaneous on conditions of the RTS DSR and DTR signals Data Terminal Ready DTE to DCE Normally DTR is used in conjunction with DSR to indicate equipment readiness DTR is turned on by the DTE to tell the DCE it is ready to receive or transmit data However a DTR data path is not provided by this model and this output signal is instead used to enable the RxD and CTS receivers of the port An Asterisk is used to indicate an active low signal IP501 OPERATION Connection to each serial port is provided through connector P2 refer to Table 2 1 These pins are tied to the inputs and outputs of EIA TIA 422B line receivers and drivers The function of the line receivers are to convert the required EIA TIA 422B voltage signals to the TTL levels required by the UART Universal Asynchronous Receiver Transmitter The line drivers convert the UART TTL levels to the EIA TIA 422B voltages The UART provides the necessary conversion from serial to parallel receive and parallel to serial transmit for interfacing to the data bus Additionally it provides data buffering and data formatting capabilities 20 SERIES IP501 INDUSTRIAL I O PACK EIA TIA 422B S
69. put level changes from low to high deasserted Additionally ISR bit 5 will be set if enabled via IER bits 6 7 Transmission will resume as soon as the CTS signal changes to the low level CTS asserted When Auto RTS is selected the RTS signal will be forced to the high deasserted state when the receiver FIFO reaches a programmed trigger level RTS will go low asserted when the 6 receiver holding register contents drops below the next lower trigger level received data trigger levels are 8 16 56 and 60 The UART will accept additional data when the transmission is suspended during hardware flow control until all FIFO locations are filled Note that Auto RTS is functional only when MCR bit 1 is set to 1 it is 7 AND ed with MCR bit 1 The RTS signal can change states by setting MCR bit 1 to 0 or 1 This provides additional flexibility for manual over ride and to maintain the hardware flow control functionality Both hardware and software flow controls can be enabled for automatic operation In this mode the UART will accept additional 8 data to fill the unused transmit and receive FIFO locations Programming Example The following example will demonstrate data transfer between one channel of the host IP501 and another node using an RTS CTS protocol Both nodes will use the FIFO mode of operation with a FIFO threshold set at 14 bytes The data format will use 8 bit characters odd parity and 1 stop bi
70. quate air circulation must be provided to prevent a temperature rise above the maximum operating temperature The dense packing of the IP modules to the carrier board restricts air flow within the card cage and is cause for concern Adequate air circulation must be provided to prevent a temperature rise above the maximum operating temperature and to prolong the life of the electronics If the installation is in an industrial environment and the board is exposed to environmental air careful consideration should be given to air filtering BOARD CONFIGURATION Remove power from the board when installing IP modules cables termination panels and field wiring Refer to Mechanical Assembly Drawing 4501 434 and your IP module documentation for configuration and assembly instructions Model IP501 communica tion boards have no hardware jumpers or switches to configure However network termination and bias resistor SIPS are installed in sockets on the board and can be easily removed where required refer to Drawing 4501 554 amp 4501 555 IMPORTANT The IP501 comes with network termination 120Q and bias 560Q resistor SIP s installed in sockets on the board You need to consider your network application carefully and remove some resistors where appropriate Termination resistors should only be installed at the ends of a network and if the transmitters are always enabled then you should remove the termination resistors from the transmitter
71. register When set to 1 this bit clears all bytes in the Tx FIFO and resets the counter logic to 0 this does not clear the shift register Receiver OE PE FE Line Status or BI See LSR Bits 1 4 Eu 00 Received Receiver Data Data Available Available or Trigger Level Reached No characters have been re moved from or input to the Rx FIFO during last 4 character times and there is at least 1 character in it during this time THRE LSR Bit 5 1100 Character Time out Indication 0010 THRE LSR Bit 5 0000 4th Modem CTS MSR Read Status asserted None j LSR Read RBR Read till FIFO below trigger level RBR Read IIR Read if LSR bit 5 is the interrupt source or a THR Write g T 11 When set to 1 this bit sets DMA Signal from Mode 0 to Mode 1 if FIFO Control Register Bit 0 1 DMA is Not Supported Not Used on IP501 16 amp IP501 16E Models IP501 64 Only Used for setting the trigger level of the Tx FIFO interrupt as follows BIT 5 4 Tx FIFO TRIGGER LEVEL 00 08 Bytes for IP501 64 Models Only 01 16 Bytes for IP501 64 Models Only 10 32 Bytes for IP501 64 Models Only 56 Bytes for IP501 64 Models Only Used for setting the trigger level of the Rx FIFO interrupt as follows BIT 7 6 Rx FIFO TRIGGER LEVEL 01 Bytes 08 Bytes for IP501 64 04 Bytes 16 Bytes for IP501 64 08 Bytes 56 Bytes for IP501 64 14 Bytes 60 Bytes for IP501
72. riting BF to the Line Control Register LCR Notes Table 3 1 1 The upper 8 bits of these registers are not driven Pullups on the carrier board data bus will cause these bits to always read high 1 s 2 The IP will not respond to addresses that are Not Used 3 All Reads and writes are 2 wait states except ID PROM reads which are 1 wait state 4 Shaded register entries apply only to the enhanced functionality of Model IP501 64 and can be ignored for Model IP501 16 units These control registers are accessed only after writing BF to the Line Control Regoster LCR This board operates in two different modes In one mode this device remains software compatible with the industry standard 16C450 family of UARTS and provides double buffering of data registers In the FIFO Mode enabled via bit 0 of the FCR register data registers are FIFO buffered so that read and write operations can be performed while the UART is performing serial to parallel and parallel to serial conversions Two FIFO modes are possible FIFO Interrupt Mode and FIFO Polled Mode Some registers operate differently between the available modes and this is noted in the following paragraphs RBR Receiver Buffer Register Ports A D READ Only The Receiver Buffer Register RBR is a serial port input data register that receives the input data from the receiver shift register and holds from 5 to 8 bits of data as specified by the character size program
73. rton for evidence of mishandling during transit If the shipping carton is badly damaged or water stained request that the carrier s agent be present when the carton is opened If the carrier s agent is not present when the carton is opened and the contents of the carton are damaged keep the carton and packing material for the agent s inspection SERIES IP501 INDUSTRIAL I O PACK EIA TIA 422B SERIAL COMMUNICATION MODULE For repairs to a product damaged in shipment refer to the Acromag Service Policy to obtain return instructions lt is suggested that salvageable shipping cartons and packing material be saved for future use in the event the product must be shipped This board is physically protected with packing material and electrically protected with an anti static bag during shipment However it is recommended that the board be visually inspected for evidence of mishandling prior to applying power v The board utilizes static sensitive components and should only be handled at a static safe workstation CAUTION SENSITIVE ELECTRONIC DEVICES DO NOT SHIP OR STORE NEAR STRONG ELECTROSTATIC ELECTROMAGNETIC MAGNETIC OR RADIOACTIVE FIELDS CARD CAGE CONSIDERATIONS Refer to the specifications for loading and power requirements Be sure that the system power supplies are able to accommodate the power requirements of the carrier board plus the installed IP modules within the voltage tolerances specified IMPORTANT Ade
74. rviced This is useful in preventing continuous interrupts on one channel from freezing out interrupt service for other channels Software Flow Control Model IP501 64 Only Model IP501 64 modules include support for software flow control Software flow control utilizes special XON amp XOFF characters to control the flow of data for more efficient data transfer and to minimize overrun errors Software flow control sometimes called XON XOFF pacing sends a signal from one node to another by adding flow control characters to the data stream The receiving node will detect the XON or XOFF character and respond by suspending transmission of data XOFF turns the data flow off or resuming transmission of data XON turns the data flow on Flow control is used frequently in data communications to prevent overrun errors or the loss of excess data For example a node might transmit the XOFF character to the host computer if the host is sending data too quickly to be processed or buffered thus preventing the loss of excess data The flow control characters are stored in the XON 1 2 and XOFF 1 2 registers Two XON amp XOFF registers are provided because the flow control character may be 1 or 2 bytes long The contents of the XON 1 2 and XOFF 1 2 registers are reset to 0 upon power up or system reset and may be programmed to any value for software flow control Different conditions may be set to detect the XON XOFF characters or start stop
75. s selected then the parity bit precedes transmission of the stop bit The parity bit is a O or 1 bit appended to the data to make the total number of 1 bits in a byte even or odd Parity is not normally used with 8 bit data Even parity specifies that an even number of logical 1 s be transmitted Thus if the data byte has an odd number of 1 s then the parity bit is set to 1 to make the parity of the entire character even Likewise if the transmitted data has an even number of 1 s then the parity bit is set to 0 to maintain even parity Odd parity works the same way using an odd number of logical 1 s Thus both the transmitter and receiver must have the same parity If a byte is received that has the wrong parity an error is assumed and the sending system is typically requested to retransmit the byte Two other parity formats not supported by this module are mark parity and space parity Mark parity specifies that the parity bit will always be a logical 1 space parity requires that the parity bit will always be 0 19 SERIES IP501 INDUSTRIAL I O PACK EIA TIA 422B SERIAL COMMUNICATION MODULE The most common asynchronous serial data format is 1 start bit 8 data bits and 1 stop bit with no parity The following table summarizes the available data formats START BIT Binary 0 a shift from Mark to Space DATA BITS 5 6 7 or 8 Bits PARITY Odd Even or None STOP BIT Binary 1 1 1 1 2 or 2 Bit times With start stop
76. s Minimum 20ns Typical 71nS Maximum 540 100pF High Z State Output Current 200uA Maximum RECEIVERS Termination Resistors 1200 Termination Resistors Installed in sockets on board see Drawing 4501 555 for location Line Receiver Linear Technology LTC489CS or equivalent Data Up to 512 Kbps Differential Input Threshold 0 2V Minimum to 0 2V Maximum Input Hysteresis 0 Input Resistance 12 Propagation Delay High to Low 55ns Maximum Cu 15pF Propagation Delay Low to High 55ns Maximum C 15pF INDUSTRIAL I O PACK COMPLIANCE Specification This module meets or exceeds all written Industrial I O Pack specifications per revision 0 7 1 Electrical Mechanical Interface Single Size IP Module IP Data Transfer Cycle Types Supported Input Output IOSel D16 or D08 least significant read write of data ID Read IDSel 32 x 8 ID PROM read on DO D7 Interrupt Select INTSel 8 bit word 008 read of Scratch Pad Interrupt Vector Register contents Access Times 8MHz Clock ID PROM Read 1 wait state 375ns cycle Channel Register Read 2 wait states 500ns cycle Channel Register Write 2 wait s
77. seen as common mode voltages common to both lines not differential they are rejected by the receivers Additionally balanced drivers have faster transition times and allow operation at higher data rates over longer distances The EIA TIA 422B standard defines a unidirectional terminated single driver and multiple receiver configuration By providing a separate data path for transmit and receive full duplex operation is accomplished The maximum data transmission cable length is generally limited to 4000 feet without a signal repeater installed EIA TIA 422B is electrically similar to EIA 485 except that EIA 485 supports multiple driver operation Consequently this board may be used to implement a full duplex EIA 485 interface see Drawing 4501 554 However for true half duplex EIA 485 operation please see the Acromag Model IP502 With respect to EIA TIA 422B logic states are represented by differential voltages from 2V to 10V The polarity of the differential voltage determines the logical state A logic 0 the space or ON state is represented by a negative differential voltage between the terminals measured A to B or to A logic 1 the mark or OFF state is represented by a positive differential voltage between the terminals measured A to B or to However for the RTS and CTS lines of the IP501 a logic 0 is the ON state and this is generated by a positive differential voltage This is because the A amp B l
78. side Likewise a network channel only needs one set of bias resistors usually on the driving end You should also remove redundant bias resistors where appropriate Failure to remove termination and bias resistors where required will significantly increase current draw and in some cases may affect performance Refer to Drawing 4501 554 amp 4501 555 for instructions CONNECTORS IP Field I O Connector P2 P2 provides the field I O interface connections for mating IP modules to the carrier board P2 is a 50 pin female receptacle header AMP 173279 3 or equivalent which mates to the male connector of the carrier board AMP 173280 3 or equivalent This provides excellent connection integrity and utilizes gold plating in the mating area Threaded metric M2 screws and spacers are supplied with the module to provide additional stability for harsh environments see Mechanical Assembly Drawing 4501 434 The field and logic side connectors are keyed to avoid incorrect assembly P2 pin assignments are unique to each IP model see Table 2 1 and normally correspond to the pin numbers of the field I O interface connector on the carrier board you should verify this for your carrier board Table 2 1 IP501 Field Pin Connections P2 Pin Description Number Pin Description Number An Asterisk is used to indicate an active low signal 6 24 49 Note that the pin wire assignments are arranged such tha
79. sion XOFF suspend transmission These characters are not stacked in the data buffer or FIFO When the ANY XON function is enabled MCR bit 5 is set the UART will automatically resume transmission after receiving ANY character after having recognized XOFF and suspended transmission Note that the UART will automatically transmit the XON character s after the flow control function is disabled if the XOFF character s had been sent prior to disabling the software flow control function Special cases are provided to detect the special character and stack it into the data buffer or FIFO and these conditions are configured via bits 0 3 of the Enhanced Feature Register EFR AT SERIES IP501 INDUSTRIAL I O PACK EIA TIA 422B SERIAL COMMUNICATION MODULE Hardware Flow Control Model IP501 64 Only 4 Model IP501 64 modules include support for hardware flow control via the RTS amp CTS signals This is useful for increasing the efficiency of the data transfer and for minimizing overrun errors Hardware flow control can be selected when either or both bits 6 amp 7 of the EFR register are set to 1 Bit 6 is used to select Auto RTS Bit 7 selects Auto CTS With hardware flow control enabled 5 the UART monitors the CTS signal for transmit operation and the receiver trigger level for RTS operation When auto CTS is selected the UART will automatically suspend data transmission as Soon as a complete character is transmitted and the CTS in
80. t Please refer to Table 3 1 for address locations The H following data below refers to the 9 Hexadecimal data format 1 Write 80H to the Line Control Register LCR This sets the Divisor Latch Access bit to permit access to the two divisor latch bytes used to set the baud rate These bytes share addresses with the Receive and Transmit buffers and the Interrupt Enable Register IER 10 2 Write 00H to the Divisor Latch MSB DLM Write 34H to the Divisor Latch LSB DLL This sets the divisor to 52 for 9600 baud i e 9600 8MHz 16 52 3 Write OBH to the Line Control Register LCR This first turns off the Divisor Latch Access bit to cause accesses to the Receiver and Transmit buffers and the Interrupt Enable Register It also sets the word length to 8 bits the number of stop bits to one and enables odd parity 18 OPTIONAL Write xxH to the Scratch Pad Register This has no effect on the operation but is suggested to illustrate that this register can be used as a 1 byte memory cell Alternately the interrupt vector for the port may be written to this register and a read will be performed on this register in response to an interrupt select cycle Write 0FH to the Interrupt Enable Register IER This enables the modem status interrupts and the receiver line status interrupts The modem status interrupt is used to signal changes in CTS to handle the protocol The line status interrupt is used to sig
81. t Driven Port B Modem Status Register R W SCR Not Driven Port B Scratch Pad Interrupt Vector Register Shaded register entries apply to Model IP501 64 units only and are accessible after writing BF to the Line Control Register LCR Table 3 1 IP501 Space Memory Map continued Serial Port C Registers Base MSB LSB LC Base Addr D15 D08 D07 R Addr D00 Bit7 READ RBR Not Driven Port C Receiver Buffer Register WRITE THR Not Driven Port C Transmitter Holding Register R W DLL Not Driven Port C Divisor 1 Latch LSB R W IER Not Driven Port C Interrupt Enable Register R W DLM Not Driven Port C Divisor 1 Latch MSB R W EFR Not Driven Port C Enhanced 1 Function Register 64 models only R W XON 1 Word 1 Not Driven Port C SW Flow Control R W XON 2 Word Not Driven Port C SW Flow Control E 1 Base 2C R W XOFF 1 Not Driven Word Port C SW Flow Control R W XOFF 2 Not Driven Word Port C SW Flow Control Base MSB LSB Addr D15 D08 D07 D00 READ IIR Port C Interrupt Identification Register WRITE FCR Port C FIFO Control Register R W LCR Port C Line Control Register R W MCR Port C Modem Control Register R W LSR Port C Line Status Register R W MSR Port C Modem Status Register R W SCR 2C Not Driven Not Driven Port C Scratch Pad Interrupt Vector Register Shaded register entries apply to Model IP501 64 un
82. t IDC D SUB ribbon cable connectors can be conveniently attached to provide serial port A pins 1 9 serial port B pins 10 18 serial port C pins 26 34 amp serial port D pins 35 43 connectivity Plus and minus following the signal name indicate differential signal polarity In Table 2 1 a suffix of A D is appended to each pin label to denote its port association A brief description of each of the serial port signals at P2 is included below A complete functional description of the P2 pin functions is included in Section 4 0 Theory Of Operation Be careful not to confuse the A D port designations of the IP module with the IP carrier board A D slot designations SERIES IP501 INDUSTRIAL I O PACK EIA TIA 422B SERIAL COMMUNICATION MODULE P2 Pin Signal Descriptions Receive Data Line Input This is the receive data input line During Loopback Mode the RxD input is disabled from the external connection and connected to the TxD output internally On this model the DTR bit of the Modem Control Register is used to enable the RxD amp CTS receivers Transmit Data Line Output This is the transmit output data line In the idle state this signal line is held in the mark logic 1 state During Loopback Mode the TxD output is internally connected to the RxD input Request to Send Output The RTS output is turned on to tell the modem it is ready to send data This signal can be set low a
83. talled on the IP module provides the identification for the individual module per the IP specification The ID PROM configuration control registers and FIFO buffers are all accessed through an 8 bit data bus interface to the carrier board 5 0 SERVICE AND REPAIR SERVICE AND REPAIR ASSISTANCE Surface Mounted Technology SMT boards are generally difficult to repair It is highly recommended that a non functioning board be returned to Acromag for repair The board can be easily damaged unless special SMT repair and service tools are used Further Acromag has automated test equipment that thoroughly checks the performance of each board When a board is first produced and when any repair is made it is tested placed in a burn in room at elevated temperature and retested before shipment Please refer to Acromag s Service Policy Bulletin or contact Acromag for complete details on how to obtain parts and repair PRELIMINARY SERVICE PROCEDURE Before beginning repair be sure that all of the procedures in Section 2 Preparation For Use have been followed Also refer to the documentation of your carrier board to verify that it is correctly configured Replacement of the module with one that is known to work correctly is a good technique to isolate a faulty module CAUTION POWER MUST BE TURNED OFF BEFORE REMOVING OR INSERTING BOARDS 21 Acromag s Applications Engineers can provide further technical assistance if required When needed
84. tates 500ns cycle Interrupt Select 2 wait states 500ns cycle 22 SERIES IP501 INDUSTRIAL I O PACK EIA TIA 422B SERIAL COMMUNICATION MODULE APPENDIX CABLE MODEL 5025 550 x Non Shielded MODEL 5025 551 x Shielded Type Flat Ribbon Cable 50 wires female connectors at both ends The x suffix designates the length in feet 12 feet maximum Choose shielded or unshielded cable according to model number The unshielded cable is recommended for digital I O while the shielded cable is recommended for optimum performance with precision analog I O applications Application Used to connect a Model 5025 552 termination panel to the AVME9630 9660 or APC8610 non intelligent carrier board A D connectors both have 50 pin connectors Length Last field of part number designates length in feet user specified 12 feet maximum It is recommended that this length be kept to a minimum to reduce noise and power loss Cable 50 wire flat ribbon cable 28 gage Non Shielded cable model uses Acromag Part 2002 211 3M Type C3365 50 or equivalent Shielded cable model uses Acromag Part 2002 261 3M Type 3476 50 or equivalent Headers Both Ends 50 pin female header with strain relief Header Acromag Part 1004 512 3M Type 3425 6600 or equivalent Strain Relief Acromag Part 1004 534 3M Type 3448 3050 or equivalent Keying Headers at both ends have polarizing key to prevent improper installation
85. ter Read IIR Write Low THR Reset Read MSR Low 2 So gt RCVR errors Interrupt RCVR data ready Interrupt THRE Interrupt Modem Status Changes IP501 PROGRAMMING Read RCVR Reset Reset Each serial channel of this module is programmed by the control registers LCR IER DLL DLM MCR and FCR These control words define the character length number of stop bits parity baud rate and modem interface The control registers can be written in any order but the IER register should be written last since it controls the interrupt enables The contents of these registers can be updated any time the serial channel is not transmitting or receiving data The complete status of each channel can be read by the host CPU at any time during operation Two registers are used to report the status of a particular channel the Line Status Register LSR and the Modem Status Register MSR 15 SERIES IP501 INDUSTRIAL I O PACK EIA TIA 422B SERIAL COMMUNICATION MODULE Serial channel data is read from the Receiver Buffer Register RBR and written to the Transmitter Holding Register THR Writing data to the THR initiates the parallel to serial transmitter shift register to the TxD line Likewise input data is shifted from the RxD pin to the Receiver Buffer Register The DTR bit of the Modem Control Register MCR bit 0 is used to enable the RxD and CTS receivers of the port Additiona
86. terrupt Enable and Time Out Interrupt FIFO Mode Enable 3 Modem Status Interrupt Enable 4 7 Not Used Set to Logic 0 MODEL IP501 64 ONLY 4 0 Disable Sleep Mode 1 Enable Sleep Mode The UART will enter a sleep power down mode and the clock oscillator circuit is disabled Any change of state on Rx RI CTS DSR and DCD will wake up the UART note that only the CTS and RTS handshake lines are implemented on this model The UART will not lose the programmed bits when sleep mode is activated or deactivated The UART will not enter sleep mode if any interrupt is pending 5 0 Disable the Received XOFF interrupt 1 Enable the Received XOFF interrupt The UART issues an interrupt when XOFF characters are received and correctly matched against the pre programmed XOFF 1 2 words 0 Disable the RTS interrupt 1 Enable the generation of an RTS interrupt when RTS changes from a low to high state 7 0 Disable the CTS interrupt 1 Enable the generation of the CTS interrupt when CTS changes from a low to high state Shaded Entries apply to Model IP501 64 functionality only A power up or system reset sets all IER bits to 0 bits 0 3 forced low bits 4 7 permanently low For IP501 64 models program access to the enhanced functionality provided via bits 4 7 of this register is gained through setting EFR bit 4 Programmed values for bits 4 7 cannot be overwritten via existing software if EFR bit 4 is
87. und Consequently the field interface connections are not isolated from the carrier board and backplane Care should be taken in designing installations without isolation to avoid noise pickup and ground loops caused by multiple ground connections The signal ground connection at the communication ports are common to the IP interface ground which is typically common to safety chassis ground when mounted on a carrier board and inserted in a backplane As such be careful not to attach signal ground to safety ground via any device connected to these ports or a ground loop will be produced and this may adversely affect operation The communication cabling of the P2 interface carries digital data at a high transfer rate For best performance increased signal integrity and safety reasons you should isolate these connections away from power and other wiring to avoid noise coupling and crosstalk interference EIA TIA 422B communication distances are generally limited to less than 4000 feet Always keep interface cabling and ground wiring as short as possible for best performance Please refer to Drawing 4501 552 for example connections and recommended grounding practices IP Logic Interface Connector P1 P1 of the IP module provides the logic interface to the mating connector on the carrier board This connector is a 50 pin female receptacle header AMP 173279 3 or equivalent which mates to the male connector of the carrier board AMP 1732
88. ve the center of the data cells will occur within 3 125 of the actual center providing an error margin of 46 875926 Thus the start bit can begin as much as one 16x clock cycle prior to being detected Note that the receivers for the channel RxD amp CTS are enabled by asserting the DTR signal via the Modem Control Register MCR bit 0 SERIES IP501 INDUSTRIAL I O PACK EIA TIA 422B SERIAL COMMUNICATION MODULE THR Transmitter Holding Register Ports A D WRITE Only The Transmitter Holding Register THR is a serial port output data register that holds from 5 to 8 bits of data as specified by the character size programmed in the Line Control Register If less than 8 bits are transmitted then data is entered right justified to the LSB This data is framed as required then shifted to the transmit data line TxD In the idle state TxD is held high In Loopback Mode this data is looped back into the Receiver Buffer Register For this model note that the transmitters for a channel TxD amp RTS are enabled via the RTS asserted signal bit in the Modem Control Register when the corresponding Transmit Enable Always Register bit is set to 0 DLL amp DLM Divisor Latch Registers Ports A D R W The Divisor Latch Registers form the divisor used by the internal baud rate generator to divide the 8MHz system clock to produce an internal sampling clock suitable for synchronization to the desired baud rate The output of the
89. y be served the UART only reflects that an interrupt is pending Interrupt Generation This model provides individual control for generation of transmit receive line status and data set interrupts on each of four channels Each channel shares interrupt request line 0 IntregO according to a unique priority shifting scheme that prevents the continuous interrupts of one channel from freezing out another channels interrupt requests After pulling the IntReqO line low and in response to an Interrupt Select cycle the current highest priority interrupt channel will serve up its interrupt vector first Interrupt serving priority will shift as a function of the last port served A unique interrupt vector may be assigned to each communication port and is loaded into the Scratchpad Register SCR for the port The IP module will thus execute a read of the Scratchpad Register in response to an interrupt select cycle Two wait states are required to complete this cycle Interrupt priority is assigned as follows Initially with no prior interrupt history Port A has the highest priority and will be served first followed by port B followed by port C then followed by port D However if port A was the last interrupt serviced then port B will have the highest priority followed by port C followed by port D then port A in a last serviced last out fashion Priority continues to shift in the same fashion if port B or port C was the last interrupt se

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