EM100 Ethernet Module Technical Manual*
Contents
1. Ethernet port and network communications ie Status LEDs Ethernet LEDs Setup Button d The Ethernet port of the EM100 is of 10BaseT type Just like any other Ethernet device each EM100 has a unique Ethernet MAC Address and must be assigned a valid IP address to function properly on the network Red Green Green Red e a eee er Donici Logically the EM100 s network interface has two ports A user definable Data Port is used to exchange Data RX Col Setup the data between the EM100 and other stations on the network Another port called Command Port has a fixed number 65535 FFFF Hex and is used to send programming commands to the EM100 s over the network MIG SEEM om Sater ya The EM100 can exchange data with remote stations using the UDP IP or TCP IP transport protocols as defined by the Transport Protocol Setting Depending on the Routing Mode Setting the EM100 can act as a network Slave or Master see Slave and Master routing modes for details Other network related settings include Destination IP address Destination Data Port Number Gateway IP address Netmask and Connection Timeout Besides UDP and TCP protocols used for data transmission the EM100 also supports ARP and ICMP ping protocols You can ping the EM100 just like any other device on the TCP IP network Serial port The serial port of the EM100 supports TX RX CTS and RTS signals and can2. EM100 Ethernet Module Tibbo EM1 00SK Starter Kit TECHNOLOGY Technical Manual No extemal conjponents Just adda connector Please register at www tibbo com to receive update notifications Version 2 1a Tibbo Technology Inc 2001 2002 Formerly User s Manual Thank you for taking an interest in Tibbo s Products Always check for updates Our every Product is an ongoing Project Basing on our Customer s feedback we are constantly working on improving and enhancing the EM100 Ethernet Module Chances are the User s Manual you are reading now is outdated Visit our website at www tibbo com for up to the minute firmware software and documentation You can also subscribe to our periodic e mail newsletter to stay informed on the latest developments at Tibbo Technology The EM100 can be customized in many ways Have an idea Let us know now Is this Manual for you This Users Manual was designed to serve as a reference for Hardware Engineers Software Developers and System Integrators seeking in depth information on the EM100 functionality and programming Our Connectivity Manual provides an additional information on the installation setup and use of the EM100 enabled devices and Tibbo Device Server Toolkit software including Virtual Serial Port Driver This Manual assumes that the Reader is a technical specialist with a knowledge of Ethernet and TCP IP networking Is your firmware
3. 13 default to high upon reset Thus connecting such an I O pin to the RST input of the EM100 will provide a reset simultaneous with the reset of the main microcontroller itself and at least as wide in duration as the reset applied to the main microcontroller It will be a responsibility of the main microcontroller s firmware to release the EM100 out of reset This reset method is recommended because this way the main microcontroller can reset the EM100 and change the EM100 s operating mode at any time 2 6 Typical application circuits Pin numbers on the z OVCC RJ45 connector may T T Bypass caps vary F Te 3 RX P3 RX P2 vce etsor Z og ERWS C CTSISEL E TX 2 7 rc RX oa iu MD i S P1 lt PO a amp TX RST RST ST j Setup a ee 9 Buron Bo ne l xX Standalone application circuit RS485 T Fig 5 Standalone application circuit e Standalone operation RS485 version shown on Fig 5 The LTC1232 reset watchdog IC is used to provide reset to the EM100 Watchdog reset strobe comes from the ER WS line A pushbutton is connected to the MD pin of the EM100 and can be used to put the EM100 into different modes of operation CTS SEL line is connected to the ER WS which selects the RS485 interface TX and RX 14 serial interface lines are connected to the MAX485 driver IC RTS DIR controls RS485 data direction Ethernet lines TX TX RX
4. See also Maximum Data Length ML Defines the amount of data in the serial gt Ethernet buffer at which the break condition will be generated and the contents of the buffer will be sent out via the Ethernet port Only relevant when the UDP IP Transport Protocol is selected Set command format SML en where len is the length of data in bytes 32 255 Get command format GML Default 255 See also Serial gt Ethernet data routing Break conditions Maximum Intercharacter Delay MD Defines the time gap after the arrival of the most recent serial character into the serial port which when exceeded leads to a break condition and makes the EM100 send out the contents of the serial gt Ethernet buffer via the Ethernet port 50 Set command format SMDdel where del is the maximum intercharacter delay 0 255 Value of 0 disables this function Actual delay is calculated as del X 10ms i e it can be in the 10 2550ms range Get command format GMD Default 1 10 ms See also Serial gt Ethernet data routing Break conditions Start On Any Character SA Defines if the next serial data block is opened on any character received or only when one of pre defined Start Characters is received Set command format SSAs where s 0 No new serial data block is opened on predefined Start Characters only 1 Yes new serial data block is opened on any character Get co
5. 7 the same 7 WAS1498 Device to device Ethemet 180am cable 8 twisted pair yee DSK TOOO1 Official CD with all the latest documentation and software
6. RX go directly to the RJ45 connector It is recommended that all four Status LEDs are provided It is a common practice to place Ethernet LEDs next to the RJ45 connector OVCC TE Bypass caps Microprocessor or microcontroller with built in Serial port Pin numbers on the RJ45 connector may vary Q 3 P3 R P2 esr p m aO CrmsIseL pio LA Q e TX P3 1 TX RX P3 0 RX DE MD pi2 O i L P1 p13 00 PO Communications coprocessor application circuit Fig 6 Communications coprocessor application circuit Communications coprocessor Fig 6 The EM100 is controlled by the main microcontroller 80C51 on the circuit diagram below By directly manipulating the RST and MD lines of the EM100 the main microcontroller can put the EM100 into different modes of operation This way the main microcontroller can program the EM100 s Settings and even download new firmware into the EM100 Four serial interface lines TX RX CTS RTS are connected directly to the I O pins of the microcontroller Ethernet lines TX TX RX RX go directly to the RJ45 connector Four LED lines may or may not be connected to the LEDs It is a common practice to place Ethernet LEDs next to the RJ45 connector 15 2 7 Mechanical dimensions L Oi C FC Tibbo NetModule _Lead flash Recommended PCB thru hole size 1mm Fig 7 Mechanical d
7. Setting error cannot enter the Normal mode In the Normal Mode e Slave Routing Mode e Master Routing Mode e Destination IP address is not reachable e Destination IP address is reachable When buffer overflow is detected In the Serial Programming mode Green LED is constantly on Green LED is blinking Green LED is constantly on Red LED blinks momentarily Green and Red LEDs are blinking Green Red Green The EM100 is constantly sending pings to the Destination IP address when in the Master Routing Mode once in every 5 seconds The Green Status LED is blinking if no reply is received The Green Status LED is constantly on when the destination replies to pings 2 10 EM100SK Starter Kit EM100SK Starter Kit consists of the EM100 Ethernet Module installed on a test PCB that provides a necessary environment for testing The board includes Fig 9 e Setup Button connected to the MD pin of the EM100 Pressing the button while the EM100 is in the Normal Mode forces the EM100 into the Serial Programming Mode Powering the EM100SK up with the button pressed puts the EM100 into the Firmware Download Mode e Status LEDs connected to SG and SR pins of the EM100 indicate EM100 s operating mode conditions See Summary of Status LED signals for details e Ethernet Status LEDs are connected to EG and ER WS pins of the EM100 Green LED blinks when the data packet is received Red LED
8. Having to supply a valid password is usually not an issue since uninitialized ex factory EM100 have a NULL password It is noteworthy that broadcast packets cannot penetrate routers bridges etc and therefore are confined to a local network segment Consequently it is impossible to assign a new IP address using this command to the EM100s outside the local network segment Example set the IP address of the EM100 whose Ethernet address is 0 1 2 3 4 5 and login password is pwd1 to 192 168 100 40 A0 1 2 3 4 5 pwd1 192 168 100 40 6 Available Settings 6 1 List of Settings by groups The following is a complete list of all available Settings Setting values are set and retrieved using Set and Get commands Code Description Network related Settings RM Routing mode slave master IP IP address of the EM100 DI Destination IP address Only relevant in the Master Routing Mode PN Data Port Number of the EM100 0 65534 DP Destination Data Port Number 0 65535 Only relevant in the Master Routing Mode TP Transport Protocol UDP TCP CT Connection Timeout never 1 255min Only relevant with TCP Transport Protocol GI Gateway IP address Only relevant in the Master Routing Mode NM Netmask
9. Programming Mode 4 3 Network Programming Available commands and replies 5 1 List or commands 5 2 List of possible reply codes 5 3 Detailed Command description Available Settings 6 1 List of Settings by groups 6 2 Detailed Setting description Available Parameters 7 1 List of Parameters 7 2 Detailed Parameter description Firmware Download Mode 8 1 Downloading new firmware file 8 2 Initializing the EM100 8 3 Possible download problems and LED signaling I O Connector pin assignment amp Cable wiring 9 1 EM100 I O connector pin assignment 6 6 6 Error Bookmark not defined 7 8 14 20 20 21 26 29 30 30 31 33 35 35 35 36 42 42 43 54 54 54 56 56 58 59 60 60 9 2 RS232 cable wiring 60 1 Introduction 9 3 Ethernet cable wiring 61 10 Specifications packing amp ordering Information 62 10 1 Specifications amp packing information 62 1 1 What is the EM100 10 2 Ordering Information 62 The EM100 is an Ethernet Module The main function of the EM100 is to network enable existing serial devices Using the EM100 you can add an Ethernet port practically to any serial device with RS232 interface You can then communicate with your serial device from any PC or other device connected to your LAN And if your LAN has a direct connection to the Internet then you can access and control your serial device from anywhere in the world 1 2 Three basic ways of commu
10. and back on again the EM100 should start normal operation 8 3 Possible download problems and LED signaling A number of errors can occur when downloading new firmware file All errors are expressed as Red Status LED signals blinking patterns One long signal One long one short signal One long two short signals One long three short signals Timeout while waiting for the data from PC Communications error KMODEM error File is too big and cannot fit in the EM100s memory EM100 program memory FLASH failure Every time you reset or power the EM100 up its internal firmware is checked for being valid If the firmware is valid the EM100 starts normal operation If the firmware you have downloaded is not valid then one of the following may occur e f you ve been downloading a correct firmware file but the download wasn t finished then the Red and Green Status LEDs will blink rapidly e If you ve downloaded a wrong file then the EM100 will not show any signs of life on startup In both cases make sure you are trying to download correct firmware file and repeat the downloading process 59 9 EM100SK I O Connector pin assignment amp Cable wiring 9 1 EM100SK I O connector pin assignment The EM100SK has one 10BaseT Ethernet port and one RS232 Serial port Pin assignment is shown in the table below To avoid common confusion all pins are designated as inputs
11. and outputs with respect to the EM100SK RS232M Serial port 9 6 ARRAY allim RX Input TX TX Output RX No connection No connection Ground No connection No connection RX RTS Output No connection CTS Input No connection No connection 9 2 RS232 cable wiring There are two kinds of RS232 cable suitable for use with the EM100SK EM100SK to Device WAS 1404 and EM100SK to PC WAS 1455 You can use your own cable in case the standard one is not suitable Cable wiring is presented in the table below 61 10 Specifications packing amp ordering Information EM100SK to Device WAS 1404 EM100SK to PC WAS 1455 eee i y DB9M Male DB9F Female DB9F Female DB9F Female 10 1 Specifications amp packing information 2 gt 2 2 gt 3 Ethemetinterface 10BaseT Ethernet 3 gt 3 lt gt 2 Serial interface TT1 level supports RS232 and RS485 communications RS232 signals RX 5 gt 5 5 lt gt 5 TX RTS CTS RS485 signals RX TX DIR 7 gt 7 7 gt 8 Network Protocols UDP TCP ICMP ping ARP 8 gt 8 8 gt 7 Deta buffer size Two independent 255 byte buffers for LAN RS232 and RS232 gt LAN cata
12. of the EM100 GIP A192 168 100 40 Initialize I Initializes the EM100 restores all Settings to their default factory values Command format I Possible replies A F D Can be issued in the Serial Programming Mode or through the network in the Network Setup Session broadcast not allowed prior login required This command performs the following 1 all Settings are restored to their default values with the following exceptions a Factory Ethernet address is not initialized because it contains unique address set by the factory and b IP address and Current Ethernet Address of the EM100 are not initialized in case this command is issued through the network 2 in case this command is issued in the Serial Programming Mode the value of the Factory Ethernet address Setting is copied into the Current Ethernet address Setting If this command fails F reply code this maybe because the Factory Ethernet address Setting contains invalid value In this case initialize it first by setting any address you can think of i e 204 134 165 0 44 55 but make sure that the first number is even then try to use the Initialize command again D reply code is returned when command is issued through the network and the Network Setup Session is not opened i e without prior login Exit E Exits the Serial Programming Mode or Network Setup Session also restarts the EM100 which puts new Settin
13. to the serial port the data packets that have originated from the remote station whose IP address matches the one defined by the Destination IP address Setting Source data port number need not match the one defined by the Destination Data Port Number Setting so the packet can be sent from any port Whenever 23 the EM100 has the data to transmit in the serial gt Ethernet direction it will send the data to the Destination IP address and Destination Data Port Number The packet will be sent to the Destination Data Port Number even if the packet received by the EM100 from the remote station originated at a different port Therefore it possible that the EM100 will be receiving the data from one port but sending it to another port e TCP IP Transport Protocol o Slave Routing Mode The EM100 will accept an incoming TCP connection from any station on the network The EM100 will not attempt to establish a connection with a remote station by itself even it the EM100 has the data to transmit in the serial Ethernet direction Once the remote station has established the connection the data can flow independently in either direction Pending serial gt Ethernet data received by the EM100 prior to the TCP connection establishment is discarded when the connection is established o Master Routing Mode The EM100 will both accept an incoming TCP IP connection and attempt to establish a connection with the remote station by itself depend
14. transmission can be increased upon request Important note you need to have an EM100SK to PC cable to be able to download new firmware Power supply DC 5V 5 70 mA 9 3 Ethernet cable wiring et cc Operating relative hurnridity 10 90 Most Ethernet installations require cables of substantial and variable length so you will probably need Module dimensions excluding leads 46nmL x 2BNMW x 137174 to make your own cables For testing purposes Tibbo supplies two kinds of Ethernet cables device to hub Shipping packing Tray 50 x EM100 tray WAS 1499 for connections through a standard Ethernet hub and device to device WAS 1498 for connections without a hub i e directly from one Ethernet device to another 10 2 Ordering Information Device to hub WAS 1499 Device to device WAS 1498 EM100 00 Bare Module gang packing 50 per tray Side A Side B Side A Side B EM100SK O0E EM100 Kit with accessories ARP 1014 110V WAS 1455 WAS 1404 WAS 1499 WAS 1498 DSK TOOL 1 1 2 1 EM1LO0SK 00U_ Sane as the above but with the ARP 1015A 220V power adaptor 2 must share 2 ARP 1014 AC 110V DC 12V power adaptor 3 Ea 3 ARP 10154 AC 220V DC12V power adaptor 4 46 WAS 1455 EM1LO0SK to PC RS232 180cmcable required for firmmare downloading 5 3 6 5 WAS 1404 EM100SK to Device RS232 140amcable 6 must share 6 WAS 1499 Device to hub Ethemet 180amn cable
15. 00SK off e Connect the EM100SKk s Serial port to the PC using WAS 1455 or similar cable e Launch the HyperTerminal and configure it as follows o When the Connection Description dialog opens type any descriptive string like EM100 and press OK o When the Connect to dialog opens select an appropriate COM port from the Connect Using drop down box for example Direct to COM1 o When the COM Properties dialog appears set communications parameters as follows Bits per second 38400 Data bits 8 Parity None Stop bits 1 Flow control None Click OK when done the HyperTerminal s main window will appear o Now choose File gt Properties from the Main menu the Properties dialog will appear o Click on the Settings tab and press the ASCII Setup button the ASCII Setup dialog will open 8 2 o Check enable three options Echo typed characters locally Send line feeds with line ends and Append line feeds to incoming line ends o Click OK twice to close both dialogs o Optional you may want to save this HyperTerminal configuration for the future use This way you won t have to go through this elaborate setup again next time Choose File gt Save from the Main menu to save this configuration under the filename you ve chosen for your connection e Choose Transfer gt Send file from the Main menu the Send file dialog will appear e Inthe Send file dialog select the firmware file that you want to download into the EM100 a
16. 400 4800 9600 19200 38400 57600 115200bps PR Parity none even odd BB Bits Per Byte 7 8 FC Flow Control none RTS CTS S0 1 S3 Set the status of PO P1 and P3 general purpose I O lines G0 G1 G2 G3 Get the status of PO P1 P2 and P3 general purpose 1 0 lines 7 2 Detailed Parameter description Baudrate BR Changes current baudrate of the EM100 s serial port This Parameter overrides the Baudrate Setting Command format PBRb where b 0 1200bps 1 2400bps 2 4800bps 3 9600bps 4 19220bps 5 38400bps 6 57600bps 7 115200bps 8 150bps 9 300bps 10 600bps See also Parity PR Changes current parity mode of the EM100 s serial port This Parameter overrides the Parity Setting Command format PPRp where p 0 Disabled 1 Even 2 Odd See also 55 Bits Per Byte BB Changes current bits byte mode of the EM100 s serial port This Parameter overrides the Bits Per Byte Setting Command format PBBb where b 0 7 bits byte 1 8 bits byte See also Flow Control FC Changes current flow control mode of the serial port This Parameter overrides the Flow Control Setting Command format PFCf where f 0 none 1 RTS CTS See also Pin Set SO 1 S3 Three Parameter to changes current output level of general purpose I O pins PO P1 and P2 Command format PSpb where p 0 PO 1 P1 3 P3 and b 0 set to l
17. Only relevant in the Master Routing Mode PW Login Password for the Network Setup Session Serial port related Settings BR Baudrate 150 300 1200 2400 4800 9600 19200 38400 57600 115200bps PR Parity none even odd BB Bits Per Byte 7 8 FC Flow Control none RTS CTS RC Remote Control of EM100 s Parameters via Parameter Commands enable disable SE Soft Entry by escape sequence into the Serial Programming Mode enable disable Serial gt Ethernet routing Settings ML Maximum Data Length 32 255bytes Only relevant with UDP Transport Protocol MD Maximum Intercharacter Delay disabled 10 2550ms 43 SA Start On Any Character no yes F1 F2 F3 Start Characters Enable Disable Not relevant when Start On Any Character yes 1 2 S3 Start Characters ASCII code Not relevant when Start On Any Character yes U1 U2 U3 Stop characters Enable Disable E1 E2 E3 Stop characters ASCII code P1 P2 P3 Stop characters Number Of Post characters System Settings EA Current Ethernet address FE Factory Ethernet address SI Serial Interface full duplex half duplex auto 6 2 Detailed Setting description Routing Mode RM Selects Slave or Master Routing Mode Set command format SRMx where x 0 Slave Routing Mode 1 Master Routing Mode Get command format GRM Def
18. Possible replies A C D Can be issued through the network only broadcast not allowed prior login not required 39 The EM100 only accepts Parameter command when the Remote Control is set to yes C reply code is returned if supplied parameter name or value is incorrect D reply code is returned if command is rejected because the Remote Control is set to no The only case when this command returns some data along with the A reply code is when the status of general purpose I O pins is read using the Pin Get command Echo X Request Echo from all listening EM100s Command format X Possible replies Aether_addr port_num where ether_addr is Current Ethernet Address of the EM100 port_num current Data Port Number Can be issued through the network only broadcast mode should be used This command can be utilized to auto detect all the EM100s on a local network segment When sent in the broadcast mode it reaches all locally attached EM100s Each EM100 then replies with its Current Ethernet Address and Data Port Number IP address is not returned because it is already contained in the IP packet s header Reply will reach the sender even when the IP address of the EM100 is not valid Ethernet address of each particular EM100 is needed for an over the network assignment of the new IP address to the designated EM100 using the Assign command It is noteworthy that broadcast pack
19. TCP IP protocol Get command format GTP Default 0 UDP IP See also Ethernet port and network communications Slave and Master routing modes vs UDP IP and TCP IP transport protocols Buffer related issues Connection Timeout CT Specifies timeout in minutes for the TCP IP connection in case no data is transmitted in any direction Set command format SCTtout where tout is the connection timeout in minutes 0 255 Value of 0 disables this function connection never times out Get command format GCT Default 5 5 minutes When no data is exchanged across the TCP IP connection for a specified number of minutes the EM100 will abort the connection automatically by sending a RESET packet This Setting prevents an idle client connection from holding the EM100 indefinitely See also Ethernet port and network communications Connections with more than two nodes many clients to one data source under TCP IP Transport Protocol Gateway IP address GI Defines the IP address of the default gateway Only relevant in the Master Routing Mode Set command format SIPgateway_ip where gateway_ip must be in the dot decimal format i e 192 168 100 40 Get command format GGI Default 127 0 0 1 Defines the IP address of the default gateway to which the EM100 sends the data in case the Destination IP address is not on the local network segment Whether the Destination IP a
20. ault 0 Slave See also IP address IP Defines own IP address of the EM100 Set command format SIPip_addr where ip_addr must be in the dot decimal format i e 192 168 100 40 Get command format GIP Default 127 0 0 1 See also Ethernet port and network communications Destination IP address DI Defines the Destination IP address Only relevant in the Master Routing Mode Set command format SDlip_addr where ip_addr must be in the dot decimal format i e 192 168 100 40 Get command format GDI Default 127 0 0 2 See also Ethernet port and network communications Data Port Number Defines own data port number for the EM100 Set command format SPNport_num where port_num must be in the 0 65534 range Get command format GPN Default 1001 Port number 65535 cannot be used since it is reserved for a command port See also Ethernet port and network communications Destination Data Port Number Defines the destination data port number Only relevant in the Master Routing Mode Set command format SDPport_num where port_num must be in the 0 65535 range Get command format GDP Default 1001 See also Ethernet port and network communications Transport Protocol TP Selects UDP IP or TCP IP communications protocol for data transmission Set command format STP where t 0 UDP IP protocol 1
21. ck as the beginning of the next block When Start On Any Character is set to no the EM100 will only open the serial data block when one of the preset Start Characters is received Up to three different Start Characters can be defined Start Characters received after the serial data block has been opened are treated as normal characters and do not restart the serial data block Stop conditions Up to three different Stop Characters can be defined to close the serial data block Once one of the preset Stop Characters is detected the EM100 closes the serial data block and attempts to send out the contents of the serial gt Ethernet buffer via the Ethernet port All subsequent serial data is ignored until the next start condition is met The use of Start Characters and Stop Characters assumes that these characters will not be encountered in the data block body Some communications protocols use checksums or other forms of data integrity verification Checksum can potentially take any value and occasionally match the ASCII codes of the Stop Characters To avoid possible confusion some communications protocols put the checksum bytes behind the Stop Characters The EM100 deals with this by allowing to define a Number Of Post characters for each enabled Stop Character For example if the Number Of Post characters for a certain Stop Character is set to 2 then the EM100 will additionally receive and count as belonging to the current ser
22. cutive SOH ASCII code 1 characters to the serial port soft entry The Soft Entry Setting of the EM100 defines if escape sequence will work Soft Entry is disabled by default Escape characters must be sent at a current baudrate When entering the Serial Programming Mode through escape sequence the EM100 preserves the current baudrate defined by the Baudrate Setting However the parity is still set to none number of bits to 8 and the flow control to none regardless of the values of Parity Bits Per Byte and Flow Control Settings The state of the RTS output line of the EM100 must be ignored when in the Serial Programming Mode Therefore you must disable the flow control in the host serial device for the duration of the Serial Programming Mode Exiting Serial Programming Mode You can exit the Serial Programming Mode either by hardware resetting the EM100 through the MD pin or by using the Exit command In both cases the EM100 restarts operation using the new Setting values format Serial command and repl All commands sent to the EM100 in the Serial Programming Mode must have the following format 32 STX 2 Command code Setting name if any Setting value if any CR 13 STX ASCII code 2 and CR ASCII code 13 provide necessary encapsulation Command code field always consists of one character i e S G etc Setting name and Setting value fields ar
23. d how this data is combined into an Ethernet packet and sent out Detailed information on the subject can be found in Serial gt Ethernet data routin 3 2 Slave and Master routing modes The EM100 routes the data in one of two modes as defined by the Routing Mode Setting 21 In the Slave Routing Mode the EM100 never sends any data transmission in the serial port gt Ethernet direction before it receives some data from the remote station first i e the data in the Ethernet serial direction The serial data received into the EM100 s serial port before the remote station contacts the EM100 is discarded In the Slave Mode the EM100 will work with any station on the network that contacts it In the Master Routing Mode the EM100 does not wait for the remote station to send the data first and routes the data in the serial gt Ethernet direction as soon as there is a data to be sent The data is always sent to a specific destination as defined by the Destination IP address and Destination Data Port Number Settings of the EM100 Also the EM100 only accepts the data sent from the remote station whose IP address matches the one set in the Destination IP address The EM100 will discard the data sent from any other IP Note that data port number of the sender is not verified so the data can be sent from any port When to use the Slave and Master Routing Modes Use the Slave Routing Mode to network enable serial dev
24. ddress is local or not is defined by the Netmask Setting See also Ethernet port and network communications Netmask NM Defines the IP address range for the local network segment Only relevant in the Master Routing Mode Set command format SNMnetmask where netmask must be in the dot decimal format i e 255 255 255 0 Get command format GNM Default 0 0 0 0 any Destination IP address is considered to be local The Netmask defines whether the Destination IP address is considered to be on the local network segment or foreign network segment In the latter case the EM100 sends the data to the default Gateway IP address rather then to the Destination IP address directly See also Ethernet port and network communications Login Password PW Defines login password for the Network Setup Session Set command format SPWpassword where password is the login password 0 6 characters long valid characters are those with ASCII codes in the 32 127 range Get command format GPW Default NULL You need to Login even when the password is set to NULL i e password has a zero length See also Baudrate BR Sets the baudrate of the EM100 s serial port Can be overridden by the Baudrate Parameter Set command format SBRb where b 0 1200bps 1 2400bps 2 4800bps 3 9600bps 4 19220bps 5 38400bps 6 57600bps 7 115200bps 8 150bp
25. e CTS SEL line is not connected to the ER WS the EM100 selects the Full duplex mode When the Serial Interface Setting is programmed to Full duplex or Half duplex it doesn t matter whether the CTX SEL line is connected to the ER WS or not the interface is selected according to the Setting Serial Transmission Mode selection happens only once when the EM100 enters the Normal Mode during the no reaction zone T4 shown on Fig 4 2 5 Reset options Reliable external reset must be provided in order for the EM100 to work correctly There are several ways to do this e By external reset IC Use a specialized reset IC like MAX810 to provide a proper powerup reset Reset ICs are more reliable than RC reset circuits since the latter are not very stable and also do not provide reset during brownouts e By external reset watchdog IC Even better solution is to use a reset IC with a watchdog function ER WS pin provides a watchdog strobe watchdog timer reset pulse at a rate of 100Hz This doesn t interfere with the primary function of the ER WS pin which is to drive the LED since the watchdog reset pulses are very short 2uS e By an I O pin of the main microcontroller If the DS100 operates as a network coprocessor to the main CPU microcontroller of the host serial device a regular I O line of this microcontroller can be connected to the RST pin of the EM100 I O pins of many popular microcontrollers like 80C51
26. e Routing Mode In the Master Routing Mode the EM100 needs to be able to send the data to a predefined remote station at any time This means that not only EM100 s own IP address and Data Port Number must be set but also the Destination IP address and the Destination Data Port Number If the destination remote station and the EM100 are residing in different network segments then the Netmask and Gateway IP address must also be set Slave and Master routing modes vs UDP IP and TCP IP transport protocols UDP IP and TCP IP provide completely different data transmission so EM100s behavior in the Slave and Master Routing Modes is slightly different under UDP IP and TCP IP Transport Protocols UDP IP Transport Protocol o Slave Routing Mode All UDP data packets arriving from any remote station and addressed to the Data Port of the EM100 are routed to the serial port For the serial gt Ethernet direction the EM100 always sends the data to the IP address and the port number that were received in the last latest UDP packet Once the EM100 receives a UDP packet from a different station it will start sending all its serial gt Ethernet data to this new station After power up and before the EM100 receives the first UDP data packet the EM100 doesn t have any IP address and port number to send the data to so all the data received into the EM100 s serial port is simply discarded o Master Routing Mode The EM100 only accepts and routes
27. e only required for certain commands Setting name always consists of two characters i e BR SA etc Setting value format depends on the type of Setting All replies returned by the EM100 in the Serial Programming Mode have the following format STX 2 Reply code Setting value if any CR 13 Reply code is always present and informs you of the command processing status OK failed etc Setting value field is only present for commands that return Setting values 4 3 Network Programming Setup commands Parameter commands and Broadcast commands can all be sent over the network Parameter commands and Broadcast commands can be sent at any time Executing Setup commands requires a Network Setup Session to be opened first Network programming is effected by sending commands to and receiving replies from the command port 65535 or FFFF Hex of the EM100 Each command and reply must be sent in its own UDP packet Opening Network Setup Session Login The Network Setup Session is opened by logging in using a Login command Correct password matching that defined by the Login Password Setting must be supplied Login command must be used even if the Login Password is set to NUILL default after the Initialization If you forgot the password you can use the Serial Programming Mode to set a new password since the Serial Programming Mode is not password protected Closing Netw
28. e used to program the Settings of the EM100 Setup commands can be issued both in the Serial Programming Mode and using the Network Programming in a so called Network Setup Session e Parameter commands are used to change the Parameters and also retrieve the values of certain Parameters These commands can only be sent over the network e Broadcast commands are sent in the Ethernet broadcast mode and are used for automatic discovery of the EM100s on the network and over the network assignment of new IP addresses Naturally the Broadcast commands can only be sent over the network See Available commands and replies for a complete description of all commands 4 2 Serial Programming Mode Serial Programming Mode is a separate mode of operation that can only be used to edit Settings via Setup commands Parameter commands and Broadcast commands cannot be issued in the Serial Programming Mode Serial Programming is effected by sending commands to and receiving replies from the EM100 s serial port 31 Entering the Serial Programming Mode There are two ways of entering the Serial Programming Mode e By pressing pulling the MD line low while in the Normal Mode on the EM100SK there is a Setup Button connected to the MD line This forces the EM100 to enter the Serial Programming Mode with default communications parameters of 38400 8 N 1 flow control none e By sending an escape sequence of three conse
29. er command All four pins PO P1 P2 and P3 can be used as inputs while only three pins PO P1 and P3 can be used as outputs General purpose I O pins are of open collector type A weak pull up resistors are already included in the EM100 module A simplified circuit diagram of each pin is shown on Fig 3 In order to sense the input status of a pin the output driver of this pin must first be set to high otherwise the pin will be kept at low state by its own output driver EM100 control pins Two control pins of the EM100 are RST and MD e RST provides a reset to the internal circuitry of the EM100 Holding this pin high for at least 10uS resets the EM100 The RST pin must be connected to a proper reset circuit otherwise the EM100 may not function properly e MD pin is used to select the operating mode of the EM100 Power supply pins The EM100 works on 5VDC 5 power 2 3 Operating modes and mode selection The EM100 has three modes of operation 11 12 Normal Mode is entered after the powerup software restart or hardware reset provided that the MD line is not pulled low It is in the Normal Mode that the EM100 performs its Ethernet amp gt Serial data routing Network Programming of the EM100 can also proceed in the Normal Mode in parallel with the data routing Serial Programming Mode is entered when the MD line is pulled low for at least 100ms or escape
30. erial data block output by the serial device for instance a complete barcode from a barcode scanner is sent out in a single UDP packet Potential data mix up can occur on the receiving end if the serial data block is transmitted in several UDP packets and several EM100 are sending data at the same time The upside of using the UDP IP is that you will only need to maintain one listening socket on the receiving end to get the data from all data sources 25 unless of course you want to distinguish between the data sources Several EM100 s Settings define how the incoming serial data is combined into Ethernet packets so you can make sure that the serial data block from is not split into several packets see serial gt Ethernet data routing for details o TCP IP Transport Protocol can be used safely but you will have to maintain a separate socket on the receiving end for every data source sending the data 3 3 Serial gt Ethernet data routing The EM100 provides a way to choose which incoming serial data is accepted into the serial gt Ethernet buffer how this data is combined into Ethernet packets and when it is sent out via the Ethernet port Serial data blocks The EM100 treats all incoming serial data as a sequence of data blocks The term data block here does not mean that the EM100 is only capable of working with a structured serial data An absolutely random serial stream can also be processed as one continuous
31. ets cannot penetrate routers bridges etc and therefore are confined to a local network segment Consequently it is impossible to use this command to discover the EM100s outside the local network segment Example X A192 168 100 40 1001 Assign A Assign new IP address to the EM100 with the specified Ethernet MAC address Command format Aether_addrlpasswordlip_addr where ether_addr Ethernet MAC address of the EM100 that is to be assigned a new IP address password Login Password for this EM100 ip_addr new IP address to be assigned Possible replies this command is never replied to Can be issued through the network only broadcast mode should be used This command is used to assign a new IP address to the EM100 with specific Ethernet MAC address When sent in the broadcast mode this command reaches all locally attached EM100s Only the EM100 whose Current Ethernet Address matches that in the ether_addr field of the command will change its IP address to ip addr value provided that correct Login Password has been supplied in the password field This command is never replied to but its result can be verified using Echo command This command is useful when you need to assign a valid IP address to the uninitialized EM100 Using the Set command to change the IP address Setting of the EM100 is not possible at this time since executing this command requires the EM100 to have a valid IP address already
32. g values into effect Command format E Possible replies no reply in case of success D Can be issued in the Serial Programming Mode or through the network in the Network Setup Session broadcast not allowed prior login required 38 No reply is returned in case of successful execution because the EM100 restarts D reply code is returned when command is issued through the network and the Network Setup Session is not opened i e without prior login Get firmware version V Gets firmware version of the currently loaded firmware Command format V Possible replies Avwv v where vwv v version string Can be issued in the Serial Programming Mode or through the network broadcast not allowed prior login is not required The version string is always encapsulated in lt and gt characters begins with the version number in the X XX format and possibly contains a small comment after a space Version numbering follows this system change in the first digit major release change in the second digit new minor features or alterations change in the third digit bug fixes but no functionality changes Example V A lt V2 10 RELEASE2 final gt Parameter P Changes and retrieves Parameters of the EM100 Command format Pppv where pp parameter v value if any See Available Parameters for a complete description of Parameters
33. he operation of the EM100 in the Normal Mode is controlled by a number of user definable Settings e Ethernet gt Serial buffer and Parameters 4 1 General information Settings and Parameters e Settings define the permanent functionality of the EM100 Settings are stored in the non volatile memory and are preserved even when the EM100 is switched off After having been changed new Setting values take effect only after the EM100 is restarted rebooted o UDP IP Transport Protocol The Ethernet gt serial buffer can easily overflow because the Ethernet is much faster than the serial port and UDP IP has no inbuilt protection against buffer overflows UDP IP should not be used to send continuous data flow and is only suitable for sending short data blocks that can fit in the buffer e Parameters are temporary overrides for certain Settings Changing Parameters have an immediate o TCP IP Transport Protocol has an inbuilt protection from buffer overflowing You can safely effect on the EM100 operation Parameters are preserved only until the EM100 is switched off or send the data of any size restarted e Serial gt Ethernet buffer The only way to protect the buffer is to enable the RTS CTS Flow Control Ways of programming the EM100 in the EM100 and on the host serial device This way the EM100 will be able to signal the host serial device to stop transmitting the data once the buffer becomes full ane EMIO can pE pr grammed in two d
34. ial data block 2 bytes of data after this Stop Character has been encountered 27 Break conditions The Maximum Data Length Setting defines the maximum number of data bytes in the serial gt Ethernet buffer can be set between 32 and 255 Once this number is reached the EM100 attempts to send out the contents of the buffer via the Ethernet port This Setting only works when the UDP IP Transport Protocol is selected This is because TCP IP has its own way to determine what size of data chunks is best for transmission over the network The Maximum Intercharacter Delay Setting defines the maximum time gap between the arrival of two consecutive serial characters into the serial port can be defined in 10ms increments between 10ms and 2 55 sec Once this time is exceeded the EM100 attempt to send out the contents of the serial gt Ethernet buffer via the Ethernet port Setting the Maximum Intercharacter Delay to 0 disables the function Default start stop break configuration By default i e after the Initialization the EM100 is configured to handle a random data stream that doesn t have any structure To achieve this the Start On Any Character is set to yes no Stop Characters are defined the Maximum Intercharacter Delay is set to 10ms and the Maximum Data Length is set to 255 bytes the latter is needed only for the UDP IP Transport Protocol As a result the very first byte received into the serial por
35. ices that never send out the data by themselves but instead are polled for data from the PC Examples of such devices are time recorders access control panels and other hardware terminals Use the Master Routing Mode to network enable serial devices that send out the data spontaneously i e without waiting for the request from PC Examples of such devices are barcode scanners and other readers that just output the data after each successful read Also use the Master Routing Mode in cases when the serial data must flow independently in both directions i e Ethernet gt serial and serial gt Ethernet This is the case for instance when you are creating a network modem that must pass the data in both directions simultaneously uired network settings for the Slave and Master Routing Modes In the Slave Routing Mode the EM100 only responds to other stations on the network When the EM100 receives the data from remote station it memorizes this station s IP address and data port number When routing the data in the serial gt Ethernet direction the EM100 will reply to this IP address and data port number Therefore the only network settings that must be set in the Slave Routing Mode are the EM100 s own P address and the Data Port Number This is true even if there is a router between the remote station and the EM100 You dont have to set the Netmask and Gateway IP when using the EM100 in the Slav
36. iiferent ways e Through the serial port of the EM100 in a Serial Programming Mode e Internal receiving buffer of the host serial device This buffer can also be protected by using the RTS CTS to regulate the exchange of data between the EM100 and the serial device e Over the network using UDP packets sent to a command port 65535 FFFF Hex This method is called Network Programming Using TCP IP and RTS CTS is the most reliable way of transmitting data through the EM100 There are several differences between the Serial Programming Mode and the Network Programming e Serial Programming Mode is a separate mode of operation The EM100 is not performing its data routing function when in the Serial Programming Mode In contrast the Network Programming is not a separate mode of operation but a method of programming Network Programming can proceed in parallel with the normal operation of the EM100 e Certain commands can only be executed through the network Some commands have different result when executed in the Serial Programming Mode and through the network Initialize command e Serial Programming Mode can always be entered even when the EM100 is not properly setup and needs to be Initialized Network Programming can only be used when the EM100 is already functional Groups of commands The EM100 is programmed using programming commands that fall into three categories e Setup commands ar
37. imensions of the EM100 16 L Max 46 2mm Length Ww Max 28mm Width H Max 13mm Height l Min 4 5mm __ Pin length m Max 1mm Lead flash d Aver 40 6mm _ Distance between pin rows p Aver 2mm Pin pitch 2 8 Board layout considerations The following layout tips should be followed e The EM100 should be located physically as close to the RJ45 connector as possible e Short direct lines should connect the EM100 s TX TX RX and RX lines to the RJ45 e The board area should be flooded filled with ground where possible except for the area around TX TX RX and RX lines Do not bring the ground or power planes too close to these four lines Following these recommendations will decrease the noise emitted by the EM100 and make passing the EMI and ESD parts of the FCC CE tests easier Fig 8 illustrates the above points EM100 Ground Fig 8 Good board layout example 2 9 Summary of Status LED signals The EM100 features four pins that can drive Ethernet and Status LEDs This Section details the Status LED signaling for the Normal and Serial Programming Modes LED signaling in the Firmware Download Mode is detailed in Possible download problems and LED signaling 17 18 Red and Green LEDs blink 3 times Red LED is blinking constantly Initialize the EM100 Entering the Normal Mode
38. indicates network data collision error e Ethernet 10BaseT port is connected to the TX TX RX and RX pins of the EM100 e Serial RS232 port is connected to the RX TX RTS DIR and CTS SEL pins of the EM100 via the RS232 driver IC 19 e Power Jack connected to the voltage regulator providing 5V power for the EM100 and other 3 Operation in the Normal Mode circuits on the board Use DC12V 200mA min power adaptor 3 1 General information e Reset IC provides a proper reset for the EM100 The main function of the EM100 is to route the data between its Ethernet and serial ports Routing means that the data received into the serial port is sent out via the Ethernet port and vise versa Data routing EM100SK is effected through two routing buffers one for each routing direction RS232 port The EM100 performs the routing in the Normal Mode of operation A number of user programmable q0baseT oon iy Tibbo Settings and Parameters define the way the EM100 works in the Normal Mode Settings define permanent ase po CE FE netmodule functionality of the EM100 and are programmed into the EM100 via its serial port in the Serial Programming Mode or via the network in the Network Programming Session Parameters are temporary overrides for certain Settings Parameters can be changed via the network only For more information see Programming the EM100
39. infinite serial data block Serial data blocks begin when a start condition is detected and end when a stop condition is detected After the start condition is detected the EM100 begins recording the incoming serial data into the serial gt Ethernet buffer Thus the start condition is said to open the serial data block When the stop condition is detected the EM100 seizes recording the data into the buffer and attempts to send out all the data accumulated in the buffer via the Ethernet port Therefore the stop condition closes the serial data block The inter block serial data i e the data received after the stop condition is detected and before the next start condition is detected is discarded Besides the start and stop conditions there is also a break condition When the break condition is detected the EM100 doesn t close the serial data block i e it continues recording subsequent serial data into the serial gt Ethernet buffer but sends out the data already accumulated in the buffer through the Ethernet port Break conditions provide a way to subdivide large serial data blocks Start conditions The Start On Any Character Setting defines if the EM100 recognizes any character received into the serial port as a start condition or requires a predefined Start Character to open the serial data block When Start On Any Character is set to yes the EM100 will accept any character following the end of the previous serial data blo
40. ing on which side sends that data first remote station or attached serial device Incoming TCP connection will only be accepted from a station whose IP address matches the one defined by the Destination IP address Setting of the EM100 Source port number need not match the one defined by the Destination Data Port Number Setting so the connection can be initiated from any port When the EM100 needs to initiate a TCP IP connection the it will attempt to connect to the Destination IP address and Destination Data Port Number Once the connection has been established the data can flow independently in either direction Note that unlike in case of UDP IP there will never be a situation when the EM100 receives the data from one port but sends the data to another port Once the TCP IP connection has been established both sides exchange the data using a single port on each side Connections with more than two nodes In many real life situations it is often necessary to have several PCs network stations access the same serial device through the EM100 many clients to one data source or have many serial devices each connected to the network via its own EM100 send the data to a single PC many data sources to one client An example of many clients to one source installation is a hardware terminal or sensor that can be polled for data from many PCs on the network A typical many sources to one client situation is
41. is the address that is unique Internet wide 2 Hardware description CTS SEL Input Clear to Send line also full duplex half duplex mode selection line LED control pins 2 1 EM100 I O pin assignment SG Output 10mA max Green Status LED control line SR Output 10mA max Red Status LED control line EG Output 10mA max Green Ethernet LED control line 1 20 ERIWS Output 10mA max Red Ethernet LED control line also watchdog strobe line 2 19 General purpose I O pins 3 18 PO Input Output Remotely controlled through Parameter command input output 4 17 P1 Input Output Remotely controlled through Parameter command input output 7 16 P2 Input Remotely controlled through Parameter command input a g P3 Input Output Remotely controlled through Parameter command input output 8 13 EM100 control pins 9 12 RST Input Reset active high 10us min pulse length 10 11 MD Input Mode selection pin see Operating modes and mode selection Power supply pins VCC 5V nominal 5 4 75 5 25V DC power 70mA max Fig 1 EM100 pin assignment GND Ground Ethernet port pins 2 2 Detailed pin description TX Output Positive line of the differential output signal pair TX Output Negative line of the differential output signal pair Ethernet port pins RX Input Positive line of
42. le you ll need any PC software that supports an XMODEM communications protocol checksum version Suitable software packages are Term95 part of a Norton Commander package QMODEM a very popular DOS program and a HyperTerminal The latter is especially widespread because it comes with every Windows distribution Procedures below assume the use of HyperTerminal for Windows The HyperTerminal is normally found in the Start gt Programs gt Accessories gt Communications gt HyperTerminal folder If it is not there then you must have opted it out when installing Windows on your PC Follow the instructions below to add HyperTerminal to your system be sure to have your Windows distribution CD handy 57 e Go to the Control Panel Start gt Settings gt Control Panel and double click on the Add Remove Programs icon the Add Remove Programs dialog will open e Click on Windows Setup tab to view the list of optional installation components e Choose Communications in the Components list and click Details e Inthe Communications window select the HyperTerminal it must be checked e Press OK to close Communications window press OK again to close Add Remove Programs e You will possibly be asked to insert the Windows CD at this point Do this and follow the instructions on the screen Once the HyperTerminal is installed follow the procedures below to download new firmware file into the EM100 e Switch the EM1
43. lf duplex or Full duplex operation can be selected through the Serial Interface Setting or in hardware using CTS SEL and ERS pins See Full duplex Half duplex Serial Transmission Mode selection LED control lines The EM100 can drive four LEDs e A pair of green and red LEDs connected to the SG and SR lines will provide a visual indication of the EM100s operating mode as well as error conditions see Summary of Status LED signals e Another pair of green and red LEDs connected to the EG and ERWS lines will provide a visual indication of the Ethernet port operation Green LED is normally on and is turned off momentarily when the EM100 receives Ethernet packets Red LED is normally off and is turned on momentarily whenever there is a data collision on the Ethernet network All LED lines are active low so the LEDs must be connected as shown on Fig 2 300 Ohm resistors should be connected in series with each LED The ER WS line of the EM100 also acts as a watchdog reset line and Serial Transmission Mode 10 selection line This does not interfere with the main function of this pin to drive the Red Ethernet LED VCC O Fig 2 Connecting LED control lines to the LEDs General purpose I O pins The EM100 features four general purpose I O pins that can be used to switch on and off loads and sense the status of connected sensors I O pins can be set and sensed remotely over the network using the Paramet
44. mmand format GSA Default 1 Yes See also Serial gt Ethernet data routing Start conditions Start Character Enable Disable F1 F2 F3 Three separate Settings to enable disable start characters 1 2 and 3 ASCII codes of start characters are defined by Start character ASCII Code Settings Not relevant when Start On Any Character is set to u yes Set command format SF1e SF2e SF3e where e 0 Disabled 1 Enabled Get command format GF1 GF2 GF3 Default 0 Disabled See also Serial gt Ethernet data routing Start conditions 51 Start Character ASCII Code S1 S2 S3 Three separate Settings to define the ASCII codes of start characters 1 2 and 3 start characters are enabled disabled through Start Character Enable Disable Settings Not relevant when Start On Any Character is set to yes Set command format SS1c SS2c SS3c where c is an ASCII code of the start character 0 255 Get command format GS1 GS2 GS3 Default 0 See also Serial gt Ethernet data routing Start conditions Stop Character Enable Disable U1 U2 U3 Three separate Settings to enable disable stop characters 1 2 and 3 ASCII code of stop characters are defined by Stop character ASCII Code Settings Set command format SU1e SU2e SU3e where e 0 Disabled 1 Enabled Get c
45. nd choose the Xmodem protocol from the Protocol drop down box Click OK when finished e The Xmodem file send for a dialog will be displayed e Press the Setup Button on the EM100SK s board and power the EM100SK up while keeping the Button pressed the download will start You may release the Button at this point e EM100SK s Green Status LED is blinking during the download and the HyperTerminal shows the file transfer progress e When the download is finished switch the EM100SK off and back on again If the Red Status LED starts blinking this means that the EM100 s Settings need to be initialized Do not exit the HyperTerminal and proceed to the next Section for further instructions Initializing the EM100 Initialize command is used to initialize the EM100 after the new firmware download e Make sure the EM100SK is powered up and press the Setup Button The EM100 will enter the Serial Programming Mode 58 e Inthe HyperTerminal window type lt CTRL B gt followed by capital I and press lt ENTER gt key Pressing lt CTRL B gt sends an STX character appears on the HyperTerminal s screen as a smiley face while pressing lt ENTER gt sends CR character see Serial command and reply format for more information e The EM100 should reply with STX A CR which means that command was completed successfully The whole dialog should look like this OI A e Switch the EM100SK off
46. nicating with the EM100 e If you have a serial device that you want to control via the network using an existing PC software then you can use the EM100 to network enable this serial device and communicate with it from the PC through our Virtual Serial Port Driver VSPD Virtual Serial Ports VSPs created by the driver are logical COMs that behave like standard hardware COMs but in reality transparently reroute the data via the TCP IP network to the EM100 enabled serial device VSPs allow you to continue using your existing PC software without any modification e If you have a serial device and are creating a new PC software to control it then you can develop software that communicates with the EM100 directly without VSPD The EM100 transmits the data using industry standard UDP IP and TCP IP communications protocols Most software development packages like Visual Basic from Microsoft provide an easy to use components that simplify exchanging data with the EM100 Turn to our tutorial Using VB to communicate with the DS100 EM100 for more information e You can also create a virtual serial link over the network by using the EM100 enabled serial device on one side and the DS100 Serial Device Server on the other side The serial port of the DS100 on the other side of the link will literally be an extension of your serial device s own serial port Provided that you have assigned a valid true IP address to the EM100 True IP address
47. ommand format GU1 GU2 GU3 Default 0 Disabled See also Serial gt Ethernet data routing Stop conditions Stop Character ASCII Code E1 E2 E3 Three separate Settings to define the ASCII codes of stop characters 1 2 and 3 stop characters are enabled disabled through Stop character Enable Disable Settings Set command format SE1c SE2c SE3c where c is an ASCII code of the stop character 0 255 Get command format GE1 GE2 GE3 Default 0 52 See also Serial Ethernet data routing Stop conditions Stop Character Number of Post Characters P1 P2 P3 Three separate Settings to define the number of post characters to follow stop characters 1 2 and 3 ASCII codes of stop characters are defined by Stop character ASCII Code Settings stop characters are enabled disabled through Stop character Enable Disable Settings Set command format SP1n SP21 SP3n where n in a number of Post characters 0 255 Get command format GP1 GP2 GP3 Default 0 See also Serial Ethernet data routing Stop conditions Current Ethernet Address EA Defines current Ethernet MAC address of the EM100 Set command format SEAe_addr where e_addr must be in the dot decimal format i e 100 101 102 103 104 105 Get command format GEA Default copied from the Factory Ethernet addre
48. ork Setup Session Network Setup Session is closed either by hardware resetting the EM100 through the MD pin or by using an Exit command In both cases the EM100 restarts operation using the new Setting values 33 format for Setup and Parameter commands Command and repl The format of Setup and Parameter Commands and replies sent via the network is similar to that of Setup commands and replies exchanged in the Serial Programming Mode with the only exception that STX and CR characters are not required sending each command and reply in a separate UDP packet provides a necessary encapsulation already Setup and Parameter Commands have the following format Command code Setting Parameter name Setting Parameter value 34 Command code field always consists of one character i e S G etc Setting Parameter name field and Setting Parameter value fields are optional and only required for certain commands Name always consists of two characters i e BR SA etc Value format depends on the type of Setting Immediate All replies sent by the EM100 over the network have the following format Reply code Setting Parameter value Reply code field is always present and informs you of the command processing status OK failed etc Setting Parameter value field is only present for replies that return values Format of Broadcast commands Broadcas
49. ow 1 set to high Note that pin P2 is input only and this command cannot control its output state See also Pin Get S0 1 2 S3 Four input Parameters to read the current input level of general purpose I O pins PO P1 P2 and P3 Command format PGp where p 0 PO 1 P1 2 P2 3 P3 Reply Ap where p 0 pin is low 1 pin is high See also 8 Firmware Download Mode Internal firmware of the EM100 can be upgraded in the field We are constantly working on the EM100 functionality enhancement so new firmware versions are released quite often New firmware versions are posted at www tibbo com You are advised to register at our site so we can let you know when the new firmware becomes available Red Status LED is blinking after you have downloaded new firmware and the EM100 doesn t seem to work You have forgotten to initialize the EM100 8 1 Downloading new firmware file New firmware file is downloaded into the EM100 through its RS232 port The file is downloaded using the XMODEM communications protocol If the EM100 is used as a standalone device the firmware file can be downloaded from the PC When the EM100 is used as a communications coprocessor the main processor of the host serial device can perform the download Procedure below shows how the firmware file can be downloaded from the PC The use of the EM100SK Starter Kit is assumed To download the firmware fi
50. roadcast not allowed prior login required 37 C reply code is returned if the Setting name is incorrect or new Setting value is invalid out of range has invalid formatting etc F reply may happen because of the EM100 s internal malfunction for example failure to save new Setting value into the non volatile memory D reply code is returned when command is issued through the network and the Network Setup Session is not opened i e without prior login Example Set the IP address of the EM100 to 192 168 100 40 SIP192 168 100 40 A Get G Get read current Setting value Command format Gnn where nn Setting name See Available Settings for a complete description of Settings Possible replies Avwv v C F D where vw v Setting value Can be issued in the Serial Programming Mode or through the network in the Network Setup Session broadcast not allowed prior login required C reply code is returned if the Setting name is incorrect F reply is returned when current Setting value is invalid or could not be retrieved situation can be rectified by setting correct value using the Set command or using the Initialize command to restore all Settings to their default factory values D reply code is returned when command is issued through the network and the Network Setup Session is not opened i e without prior login Example Get the IP address
51. ror or malfunction Access denied This reply code can only be sent in response to a network command It OIn a gt means that you haven t logged in properly or have supplied an incorrect Login Password 36 5 3 Detailed Command description Command and reply strings below are shown without STX and CR characters STX CR encapsulation is required when sending commands via the serial port see Serial command and reply format for details Login L Opens Network Setup Session for the programming of EM100 s Settings over the network Command format Lppp p where ppp p login password Possible replies A F D Can be issued through the network only broadcast not allowed Login password is defined by the Login Password Setting Default password is NULL but login is still required to open the Network Setup Session F reply may happen because of the EM100 s internal malfunction for example inability to retrieve current password from the non volatile memory D reply code is returned when the supplied password is incorrect Set S Set write new Setting value Command format Snnvw v where nn Setting name vvv v Setting value See Available Settings for a complete description of Settings Possible replies A C F D Can be issued in the Serial Programming Mode or through the network in the Network Setup Session b
52. s 9 300bps 10 600bps Get command format GBR Default 5 38400bps See also Parity PR Selects the parity mode of the EM100 s serial port Can be overridden by the Parity Parameter Set command format SPRp where p 0 Disabled 1 Even 2 Odd Get command format GPR Default 0 Disabled See also Bits Per Byte BB Defines the bits byte mode of the EM100 s serial port Can be overridden by the Bits Per Byte Parameter Set command format SBBb where b 0 7 bits byte 1 8 bits byte Get command format GBB Default 1 8 bits byte See also Flow Control FC Selects the flow control mode for the EM100 s serial port Can be overridden by the Flow Control Parameter Set command format SFCf where f 0 none 1 RTS CTS hardware Get command format GFC Default 0 none You are recommended to choose the RTS CTS flow control whenever possible See also Buffer related issues Remote Control RC Enables Disables EM100 s Parameter changing through the Parameter command Set command format SRCp where p 0 Disabled 1 Enabled Get command format GRC Default 1 Enabled See also Soft Entry SE Enables disables entry into the Serial Programming Mode by escape sequence Set command format SSEs where s 0 Disabled 1 Enabled Get command format GSE Default 0 Disabled
53. sequence is sent into the EM100 s serial port while the EM100 is in the Normal Mode This mode is used to program the EM100 s functioning parameters Settings via the serial port Firmware Download Mode is entered when the EM100 is powered up restarts or exits from reset with the MD line pulled low This mode is used to download new firmware file into the EM100 Normal mode Prog mode RST RST MD MD F ware d load mode Entering the Serial Programming Mode Entering the Firmware Download Mode T Max 1s No reaction zone time it takes the EM100 to enter the Normal Mode of operation after the powerup software restart or hardware reset T2 Min 20ms MD holding time to enter the Serial Programming Mode Ts Min ms MD holding time to enter the Firmware Download Mode Fig 4 Using MD line to change the operating mode 2 4 Full duplex Half duplex Serial Transmission Mode selection The EM100 can perform serial communications in the Full duplex or Half duplex Serial Transmission Mode Mode selection is effected through the Serial Interface Setting or through the CTS SEL and ERWS pins When the Serial Interface is set to Auto the EM100 selects between the Full duplex and Half duplex Serial Transmission Modes basing on the hardware configuration When the CTX SEL line is connected to the ER WS line the EM100 selects the Half duplex mode When th
54. ss Setting This Ethernet address is used by the EM100 during operation See also Initialize I Factory Ethernet Address FE Keeps default Ethernet address Set command format SFEe_addr where e_addr must be in the dot decimal format i e 1 2 3 4 5 6 53 Get command format GFE Default unique number for each EM100 produced This Setting contains a default Ethernet address assigned to a particular EM100 during production Tibbo Technology initializes each EM100 to different Ethernet address number You are advised to never change it If you want to change the Ethernet address of the EM100 do this by changing the value of the Current Ethernet Address Setting During the Initialization the value of this Setting is copied into the Current Ethernet Address thus restoring factory Ethernet address for use See also Initialize Serial Interface SI Selects full duplex or half duplex mode for serial interface Set command format SSI where i 0 RS232 1 RS485 2 Auto Get command format GSI Default 2 Auto See also Full duplex Half duplex Serial Transmission Mode selection 7 Available Parameters 7 1 List of Parameters The following is a complete list of all available Parameters Parameters are set using Parameter command Name Description BR Baudrate 150 300 1200 2
55. t commands have no unified format Format of each Broadcast command and corresponding reply is described in Available commands 5 Available commands and replies 5 1 List or commands Code S N B L Description Setup commands L Login open Network Setup Session S Set write new Setting value G Get read current Setting value l Initialize restore Settings to their default factory values E Exit Serial Programming Mode Network Setup Session restart the EM100 V Get firmware version Parameter commands P Change Parameter value Broadcast commands X il Request echo from all listening EM100s A Assign new IP address to the EM100 with the specified Ethernet address Columns S command is available in the Serial Programming mode N command can be issued through the network B command can be issued through the network in broadcast mode L when issued through the network this command requires prior login Network Setup Session must be opened first 5 2 List of possible reply codes Code Description Completed successfully may be followed by data if this command returns data Invalid command Setting Parameter name or Setting Parameter value Command execution failed internal er
56. t is regarded as a beginning of the serial data block that never ends Once there amount of data in the serial gt Ethernet buffer reaches the limit or there is a gap in the serial transmission the EM100 combines all serial data it has already received and sends it out Practice shows that this arrangement works very well not only for a random data flow but also for structured data Consider for example a case in which a hardware terminal with the EM100 exchanges the data with PC using command reply communications protocol In this situation every time the hardware terminal finishes transmitting a reply to the PC it starts waiting for the next command to process This creates a gap in the serial data coming into the EM100 s serial buffer After a small delay of 10ms the EM100 routes the end of reply to the PC The 10ms delay slows a system down a little bit but is in fact negligible for most serial applications 28 3 4 Buffer related issues 4 Programming the EM100 When using the EM100 be careful not to overflow its internal Ethernet gt serial and serial gt Ethernet buffers The overflow can occur because of the difference in receive transmission speeds on the Ethernet and the serial sides of the EM100 Red Status LED blinks momentarily when overflow happens In addition the internal receiving buffer of the host serial device can potentially overflow if the EM100 outputs the serial data too fast T
57. the differential input signal pair The EM100 is designed to attach directly to the RJ45 10BaseT Ethernet connector Standard magnetics RX Input Negative line of the differential input signal pair circuitry YCL part 20F001N has been included onboard to provide a glueless interface to the Ethernet Serial port pins network TX Output Serial transmit line i ae RX Input Serial receive line When performing the PCB layout for the host serial device observe the layout guidelines set forth in p RTS DIR Output Full duplex mode request to send Half duplex Mode data direction control Serial port pins The serial port includes four interface lines and can work in a Full duplex or Half duplex Transmission Mode In the Full duplex Transmission Mode the EM100 supports RX TX RTS and CTS signals In the Half duplex Transmission Mode the EM100 provides RX TX and DIR signals DIR pin is used to control the data direction All lines of the EM100s serial interface are CMOS level active low TX and RX lines are high when idle start bit is low level and stop bit is high High on CTS and RTS lines means transmission prohibited low transmission allowed Serial lines of the EM100 can be connected directly to the serial port pins of most microcontrollers and microprocessors also to the RS232 driver IC i e MAX232 for Full duplex operation or RS485 driver IC i e MAX485 for Half duplex operation Ha
58. up to date This Manual describes the functionality of the EM100 Ethernet Module running V2 1x firmware If your EM100 has an older firmware you need to upgrade to this new firmware first See Firmware Download Mode for a complete information on how to upgrade the EM100 Seeking further assistance If you cannot find an answer to your question or problem you are encouraged to send us an e mail support tibbo com for technical problems e feedback tibbo com for your suggestions e sales tibbo com for sales inquiries info tibbo com for all other inquiries How to print out this Manual This Manual is supplied in two forms screen optimized and print optimized Use the screen optimized document EM100 Technical Manual to conveniently view the Manual on your PC screen Use the print optimized version of the above EM100 Technical Manual print to make a hardcopy of the Manual The printed version arranges 2 small document pages per single A4 sheet Table of Contents Introduction 1 1 What is the EM100 1 2 Three basic ways of using the EM100 Controls operating modes and signals 2 1 EM100 connectors and controls 2 2 Operating modes 2 3 Summary of Status LED signals Operation in the Normal Mode 3 1 General information 3 2 Slave and Master routing modes 3 3 Serial gt Ethernet data routing 3 4 Buffer related issues Programming the EM100 4 1 General information 4 2 Serial
59. when several barcode scanners must send the data to a single PC on the network e Many clients to one data source operation is achieved by using the EM100 in the Slave Routing Mode The EM100 will reply to any sender in this mode so any station will be able to access the host serial device with the EM100 inside o UDP IP Transport Protocol should not be used if there is a chance that several different clients will send the requests to the same EM100 serial device at the same time Data mix up will result on the serial side and the EM100 won t be able to route the data back to the respective sender of each command correctly o TCP IP Transport Protocol can be used safely since when one client is already connected to the EM100 others won t be able to gain access to the same EM100 until this client disconnects To prevent one client from holding the TCP IP connection to the EM100 indefinitely there is a Connection Timeout Setting that defines after how long the EM100 will abort the connection in case there is no data transfer in any direction e Many data sources to one client operation is achieved by using the EM100 in the Master Routing Mode In this mode the EM100 will route all its serial gt Ethernet data to the Destination IP address and Destination Data Port Number Any number of EM100s can be set to send the data to the same destination o UDP IP Transport Protocol can be used in this arrangement but you must make sure that each s
60. work at baudrates up to 115200 In the Normal Mode the serial port transmits the data between the EM100 and attached serial device microcontroller In the Serial Programming Mode the port is used to program the EM100 s Settings Settings that define the operation of the serial port include the Baudrate 150 115200bps Parity none even or odd Bits Per Byte 7 or 8 and Flow Control none or CTS RTS Each of these Settings has a matching Parameter that overrides the value of a corresponding Setting Routing buffer The data between the Ethernet port and the serial port is routed via two independent 255 byte buffers one for each routing direction Buffers are necessary because the Ethernet and the serial port operate at different speeds and in different ways Ethernet carries the data in packets i e groups of data while the serial port sends and receives a serial stream where each data byte is independent Here is how the EM100 transforms the Ethernet packets into the serial stream and back e Ethernet gt serial data routing is simple the EM100 outputs the contents of arriving Ethernet data packets byte by byte via the serial port The EM100 does not check of filter the contents of data being routed in the Ethernet gt serial direction e Serial Ethernet routing requires grouping arriving serial data into packets and is more complicated Several Settings define exactly what serial data is accepted into the buffer and when an
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