User`s Manual - Centaurus Prime
Contents
1. B J2 TERM CEND OF LINE ONLY J3 PULL DOWN CKEND OF LINE ONLY PULL UP CEND OF LINE ONLY 2W74W JUMPER INSTALLED J15 STATIC BLEED FULL DUPLEX JUMPER CONFIGURATION CENTAURUS SYSTEMS RX PAIR UB CTS DELAY2 CTS DELAY1 ROGRAM CTS DELAYO US A INSTALLED JUMPERS J2 RX TERM CEND J3 RX PULL DOWN RX PULL UP CEND 75 TX TERM CEND J TX PULL DOWN JZ TX PULL UP CEND J15 STATIC BLEED EARTH G LINE LINE LINE LINE LINE LINE 5Udc COMMON EARTH CHASSIS ONLY ONLY ONLY ONLY ONLY ONLY TWISTED PAIR DO NOT CONNECT SHIELD TYPICAL JCI N2 BUS JUMPER CONFIGURATION vis S ee al uz 5485 4 8224582 wm PROGRAM CTS DELAYO no INSTALLED JUMPERS 22 TERM CEND OF LINE ONLY J3 PULL DOWN OF LINE ONLY J4 PULL UP OF LINE ONLY Ca es ls se 2W74W JUMPER INSTALLED J15 STATIC BLEED 50 COMMON EARTH CHASSIS BAUD 2 9600 KEYDNO gt 800 5 DCD DATA MODE RTS DATA MODE2. or 2 wire configurations Up to 32 devices may be connected together on one communication line The CS485 can also be used as a dual port half duplex splitter As a master the CS485 can talk to two trunks of up to 31 half duplex devices This allows the CS485 to talk to up to 62 devices A variety of timing and control options are available on the CS485 An RTS to CTS delay provides the ability to turn on the RS 485 transmitter before sending data to allow the communication line to stabilize RS 485 transmitter control may be implemented using the RS 232 RTS signal or the presence of RS 232 TX data A unique capability of the CS485 is the ability to sense the presence of received RS 485 carrier remote RS 485 driver enabled This is very uselul for controlling devices that require a turn on delay before data can be transmitted like radio modems The carrier detect signal can also be based on the presence of received RS 485 data All timing functions are crystal controlled and provide very accurate and stable delays Temperature and voltage fluctuations will not affect the CS485 s operation The CS485 has 1500 volt optical isolation between the RS 232 side and the RS 485 side The RS 485 lines are protected with 2 stages of surge protection and jumpers allow complete configuration of terminating and pull up down functions CS485 Configuration and Setup 4 wire Operation J8 OUT 4 wire operation provides full duplex capability for p
3. oscillating in noisy environments The pull up pull down and termination jumpers J4 J3 and J2 must be installed on each end of the communication line for proper operation The DCD output will maintain its last state when the RTS signal is asserted and the CS485 is used to transmit data Carrier detect can also be asserted based on the presence of received data If the DCD jumper on J10 is installed the RS 232 DCD signal is asserted when incoming RS 485 data is received The DCD signal is asserted as soon as RS 485 data is detected Following the last character the DCD signal is held active for the delay time set by the Keydown Delay jumpers before being de asserted The baud rate jumpers on J10 must be set to the desired baud rate Transmitter Control The CS485 s RS 485 transmitter may be controlled by either the RS 232 RTS control signal or the presence of data on the RS 232 TX data pin If the RTS signal is used to control the transmit function any data format or baud rate may be used If TX data is used to control the transmit function the desired baud rate must be set using the jumpers on J10 and a data format of 1 start bit 8 data bits and 1 stop bit is assumed The length of time that the RS 485 transmitter remains enabled following the end of the last character is determined by the Keydown Delay jumpers Baud Rate Selection Jumper J10 is used to select the desired baud rate Baud rates range from 1200 to 115 2K The CS485 exp
4. response and provide a path to earth ground for high voltage transients The second stage of transient protection uses Transorbs which are connected to the isolated common of the RS 485 section The make sure all transient signals are clamped to within the normal operating voltage of the RS 485 electronics Under certain conditions some devices introduce a large ac or dc voltage on the RS 485 communication lines referred to as common mode voltage This does not present a problem unless the common mode voltage exceeds the SiDACtor s clamping voltage If common mode voltages in excess of 25V are expected leave the connection from J9 3 Earth to ground open so that the SiDACtor s will not try to clamp the common mode voltage to earth ground The SiDACtor s and Transorbs will still provide transient protection but not as effectively for very large transients lightning for example Leaving the Earth connection open allows the CS485 to operate reliably with common mode voltages in excess of 100V Shield Connection The isolated ground common of the CS485 is connected to J1 3 SHLD shield wires of the communication cables are normally connected to this point Care must be taken to avoid ground loops Only one end of the shield should be connected to earth ground Under some conditions other devices may induce a large common mode voltage on the shield wire Under these circumstances leave the CS485 s connect
5. 2 output based on detected RS 485 carrier DATA RTS Jumper IN RS 485 transmit enable based on RS 232 transmit data OUT RS 485 transmit enable based on RS 232 RTS signal J13 Jumper Settings RTS to CTS Delay CTS DELAY2 CTS DELAY1 CTS DELAYO RTS to CTS Delay Time e O O O O O O O e O O RS 485 RX and TX Jumpers J4 Enable pull up resistor for RX line J3 Enable pull down resistor for RX line J2 Terminate RX pair with 120 ohm resistor J7 Enable pull up resistor for the TX line J6 Enable pull down resistor for the TX line J5 Terminate TX pair with 120 ohm resistor J8 IN Enables 2 wire operation for both RX and TX pairs Dual port operation OUT Enables 4 wire operation RX is receive pair TX is transmit pair J15 Connects isolated RS 485 common to bleed resistor and filter cap Line Termination CS485 s termination jumpers should only be installed if the CS485 is physically at one end of the trunk To terminate the RX pair install jumpers J2 J3 and J4 To terminate the TX pair install jumpers J5 J6 and J7 Transient Protection and Grounding Transient Protection The CS485 has 2 stages of transient protection The first stage connects each RS 485 data line to a SiDACtor The common side of the SiDACtor s are connected to the EARTH terminal of J9 Figure 1 SiDACtor s provide ultra fast transient
6. CS485 User s Manual Dv TH R19 EAR i X C9 macaa E TR20 CTS RTS icTs DELAY2 icts DELAY1 DELAYO Ea Be 4 Version 2 0 2003 ZYPEX Inc Table of Contents Product Description CS485 Configuration amp Setup 4 wire Operation 2 wire Operation Dual Port Operation Carrier Detect Transmitter Control Baud Rate Selection Keydown Delay CTS Delay J10 Jumper Settings Baud Rate Selection Keydown Selection Data DCD Jumper Data RTS Jumper J13 Jumper Settings CTS Delay RS 485 RX and TX Jumpers Line Termination Transient Protection and Grounding Transient Protection Shield Connection Static Control Connectors Power RS 232 RS 485 RJ11 Product Specification Trouble Shooting Appendix A Half Duplex Jumper Configuration Full Duplex Jumper Configuration JCI N2 Bus Jumper Configuration O gt cO Product Description The CS485 line driver is RS 232 to RS 485 interface converter It allows RS 232 device to reliably transmit data over long distances up to 4000 feet The CS485 has many features not normally found in typical line drivers and is intended for operation in harsh industrial environments The CS485 may be used in point to point applications as well as multi drop applications using either 4 wire
7. alf duplex 2 wire half duplex RS 232 RTS RS232 Tx Data RS 485 received carrier RS 485 received data RS 232 RTS to CTS RS 485 Tx Keydown DCD Data Delay Tx Rx RTS DCD amp Power LED s 1500 Volt Isolation 2 stages of protection Sidactor Transorb and 15kV ESD protection on RS 232 port Input reversal protection Transorb surge protection Solid state fuse 3 25 Snap Track CS485 24V 8 to 35 300mA to 90 110mA 24 Vdc typ 0 700 Single Dual RTS Mode Data Mode DCD Mode Data Mode Tx enable delay Tx turnoff delay DCD turnoff in data mode Tx Rx RTS DCD amp Power LED s Optically Isolated 2 stages of protection Sidactor Transorb and 15kV ESD protection on RS 232 port Input reversal protection Transorb surge protection Solid state fuse Curtis Industries TR3 Trouble Shooting Erratic DCD and RX LEDs If the DCD and or RX LEDs appear to flicker erratically when the CS485 is connected to an active RS 485 trunk a large common mode voltage may be present Measure the voltage on the RX and RX lines with respect to earth ground If the voltage exceeds 25 V ac or dc disconnect the ground connection from J9 pin 3 10 TWISTED PAIR Appendix A Typical Jumper Configurations HALF DUPLEX JUMPER CONFIGURATION CENTAURUS SYSTEMS 5Udc COMMON EARTH CHASSIS UB osses REPRES INSTALLED JUMPERS Ears
8. ects a data structure of 1 start bit 8 data bits and 1 stop bit Keydown Delay Keydown delay refers to how long a control signal remains active following the last bit of the last character being sent If the RS 485 transmitter is being controlled by RS 232 TX data J10 RTS jumper installed then the transmitter will remain enabled for the time duration specified by the Keydown jumpers following the end of the last character If the RS 232 DCD signal is based on received RS 485 data J10 DCD jumper installed then the DCD signal will remain asserted for the time duration specified by the Keydown jumpers following the end of the last received character Delays can range from 100us to 12 8ms CTS Delay The CTS delay jumpers provide a delay from the time the RS 232 RTS signal is asserted until the time the RTS 232 CTS signal is asserted back to the controlling device This is useful for providing a delay before transmit keyup delay and relieves the controlling device from generating precise timing functions Delays range from Oms to 12 8ms 410 Jumper Settings BAUD Rate Selection BAUD RATE KEYDOWN Selection KEYDN2 KEYDN1 KEYDNO KEYDOWN TIME e O jo e O O Denotes jumper installed e Denotes jumper installed DATA DCD Jumper IN DCD RS 232 output based on RS 485 received data OUT DCD RS 23
9. ion to earth ground J9 3 open see CS485 Transient Protection and Grounding and Figure 1 Static Control When jumper J15 is installed and J9 3 is connected to earth ground the CS485 provides a bleed resistor which prevents static voltage buildup on the isolated section The bleed resistor ensures that the isolated section is always at a safe voltage potential The same connection provides a filter cap which shunts any high frequency noise that may be induced on the RS 485 communication lines to earth ground RX RX SHIELD TX TX CS485 154 STAGE TRANSIENT PROTECTION AND GROUNDING ISOLATED RS 485 SECTION AND CONNECT TO EARTH GROUND SIDACTORS Connectors Power J9 5 CS485 5 8Vdc to 35Vdc CS485 24 Common for J9 1 Earth Ground RS 232 J14 TX Data Input RX Data Output RTS Input CTS Output DCD Output DSR Output Common Ground RS 485 J1 Isolated Common Shield TX TX RJ11 Description CTS Output TX Data Input no connection Common RX Data Output RTS Input CS485 Specifications MODEL Power Operating Temperature Operating Modes Transmit Control Carrier Detect Delay Functions Operation Display Isolation Surge Protection Power Protection Mounting CS485 5V 5Vdc 250 to 350 0 70DegC 4 wire full duplex 4 wire half duplex 2 wire h
10. oint to point configurations 4 wire half duplex configuration is also useful where the master unit is always transmitting to the slave units and the slave units respond to the master in half duplex style This simplifies the control software for the master and can provide a speed advantage over 2 wire half duplex configurations The slave units can enable their transmitters using either RTS control or data control 2 wire Dual Port Operation J8 IN Multi drop applications typically use a 2 wire configuration Installation requires a single twisted pair and all nodes can talk to each other Many applications use a single master with multiple slaves The CS485 is capable of dual port 2 wire operation If J8 is installed the RX and TX pairs both operate as half duplex ports A CS485 configured for dual port operation can communicate with 2 trunks of half duplex slaves This allows the CS485 to talk to 2 trunks of 31 slaves or 62 slaves total Carrier Detect A feature available on the CS485 that is not available on most line drivers is the ability to detect when a remote line driver has turned on its transmitter This is useful for controlling other equipment that may require carrier control like radio modems This signal is passed to the RS 232 port as the Data Carrier Detect DCD signal Carrier detect works by sensing a voltage level greater than 850mV between the RX and RX wires Built in hysteresis prevents the DCD signal from
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