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1. Module Name PC E 0 None 1 Even 2 Odd 0 RS232 1 RS485 X 10 milliseconds X 1 milliseconds X 1 milliseconds e Baud Rate Data Bits Parity and Stop Bits The configuration of the serial port can be configured by selecting the parameters from the pull down menu Click on the Submit button to load these values into the Protocol converter e RS232 RS485 This field is used to select RS232 or RS485 on the serial port e Serial Reply Timeout This timeout is the time the module waits for a reply from a slave device If a reply is received then this timeout is cancelled and the converter looks for the next TCP message If the slave does not send a reply then this timeout will expire and allow the converter to look for the next TCP message This timeout must be longer than the turn around time of the slave device or it will timeout before the slave replies This timeout only operates in Mode O e RS485 on Delay This is the time the RS485 transmitter will be enabled before data is transmitted This has no effect on RS232 communications e RS485 off Delay This is the time the RS485 transmitter will be enabled after data is transmitted This has no effect on RS232 communications e Module Name This field allows you to enter a module description name into the Protocol converter This is an identifier for diagnostic maintenance purposes and is chosen to best describe the Protocol converter in the system by name or number 18 7 Confor
2. The timer is labeled Char Timeout on the ip htm web page The client converter must be configured to use a PORT number chosen by the user This port number must be the same which is programmed into the server converter This Port number informs the converter that any data that is received in a socket must be transmitted out the serial port without any protocol conversion and must not be one of the reserved numbers 21 ftp 80 http 502 Modbus This is the mode that is used to create a transparent point to point serial Ethernet serial link with a server converter The Client converter has to open the socket with the Server converter In order to do this the IP address of the Server must be configured in the Client converter This is done on the ip htm web page and is labeled Server IP 3 Physical Dimensions The Converter enclosure is shown below The module has been designed with a quick snap in assembly for mounting onto DIN rail s as per DIN EN 50 022 70 00 mm 99 50 mm 2 1314 15 16 17 18 19 20 21 22 23 2 ee eg a a e E E a A E E 106 mm L 46 00 mm m 60 00 mm 12346 5 6 7 8 9 10 11 12 16 06 3 1 Grounding Shielding In most cases the converter will be installed in an enclosure along with ot
3. REE A ER R E cess 8 3 1 Grounding Shieldin ge dais 8 4 Technical Specification ci iii 9 Dis NN 9 6 Configuration ic a a ea 10 6 1 Power Connect isis iia 10 6 2 Ethernet Connections sinasina n scans ond i Hoekies illes 10 6 3 Indication LED Sivad a tea hdd 10 6 4 Connecting to a PC which is not Connected to a Netwolrk oooonciicnonnnciononnnnnncencnncononncanonnno 11 6 5 Connecting to a PC which is connected to a NetwoTkK ooooonoonnnnnnioonnocnooncconocnnonononnnnnnonnnca nono 12 6 6 Testing the Connection titi dba 13 6 1 Viewing Web Pages oido bilbao 14 6 83 Troubleshooting Guid arisia mei is tits 15 69 Parameter Configuration debas hallada 16 Te Conformity Certifica dl a 19 1 Description The Ethernet Serial Converter enables serial devices such as Modbus based lO modules communicating on RS232 485 to be connected to a 10 100 Base TX Ethernet network The Ethernet Serial Converter can be configured to operate in a number of different modes depending on the application It can be configured as a transparent data link or it can perform the gateway function of converting Modbus TCP messages to Modbus RTU messages The PC E converters are factory programmed with a default IP address of 192 168 0 112 This address must be changed before the converter is added to an existing Ethernet network The IP address in the converter should be unique in the network and can be changed via the Web Server Web server allows setting IP
4. non condensing 5 Wiring RS232 RX DATA 7 RS232 TX DATA 8 RS232 GND 6 y 1 12 24V DC gt LOGIC POWER z INPUT E 3 TO RS485 TCOMMS NETWORK comms RJ45 10 100baseTX Please Note You must select RS232 or RS485 on the ip htm web page 6 Configuration 6 1 Power Connections The Ethernet Serial Protocol converter must be clipped onto a DIN rail Power for the Protocol converter PC E must be applied to terminal 1 12 24VDC and terminal 2 OV The power LED will illuminate and all LED s will be off 6 2 Ethernet Connection Next the Ethernet connection is required either through a network or directly toa PC The Ethernet interface uses a standard RJ45 connector 6 3 Indication LED S The led s on Protocol converter are used to indicate the operation of the module Ethernet Link Established Ethernet Activity on Network Receive Serial Communication Transmit Serial Communication Power supply On Modbus TCP Communication Web Server Communication 10 6 4 Connecting to a PC which is not Connected to a Network If the PC is equipped with an Ethernet card but not connected to a network a local network address should be used for communication between the Converter and the PC The PC E converter is shipped with a default IP address 192 168 0 112 For direct connection between the PC and the Protocol converter a crossover Ethernet cable is required PC ST
5. 6 6 Testing the Connection To test the connection between the PC and the Protocol converter a simple program called ping can be used Ping sends a number of messages to the specified IP address and displays the response The ping program can be run from the command line or from a DOS prompt on the PC as follows e Open the Windows Start Menu e Click Run e Inthe Open box type ping 192 168 0 112 If the network connection is OK between PC and Protocol converter the program will respond with Reply from 192 168 0 112 and information about the response time Microsoft Windows KP Version 5 1 2666 lt C gt Copyright 1985 2661 Microsoft Corp C Documents and Settings user gt ping 192 168 Pinging 192 168 606 243 with 32 bytes of data Reply from 192 168 6 243 bytes 32 time 2ms TTL 64 Reply from 192 168 090 243 bytes 32 time ims TTL 64 Reply from 192 168 6 243 bytes 32 time lt ims TTL 64 Reply from 192 168 0 243 bytes 32 time lt ims TTL 64 Ping statistics for 192 168 6 243 Packets Sent 4 Received 4 Lost z loss Approximate round trip times in milli seconds Minimum ms Maximum 2ms Average Gms C Documents and Settings user gt If there is a problem with the network setup the program will respond as follows Cy Microsoft Windows XP Version 5 1 2606 lt C gt Copyright 1985 2661 Microsoft Corp C Documents and Settings user gt ping 192 168 6 112 Pinging 192 168 0 112 with 32 bytes
6. RAIGHT THRU HUB PC CROSSOVER PC xX 1 RY TX 1 TX TX 2 GD 2 Rx TX 2 2 TX RX 3 OD 3 TX PX 3 3 RX A D 4 4 4 5 ESTO 5 5 RX 6 DO 6 TX RX 6 6 RX 7 CLS Ci 7 Se Y 8 II Y To setup your PC to connect directly to the Protocol converter PC E an IP address in the same range as the Protocol converter must be assigned to the PC In Windows environments this should be done as follows Connect the PC and the Protocol converter together using a crossover cable Open the Windows Control Panel Select Network Select TCP IP gt the PC s Ethernet adaptor from the Configuration tab as shown below Network 12 1x Configuration Identification Access Control The following network components are installed 3 IPX SPX compatible Protocol gt Internet Connection Shar_4 TCP IP Shared gt Dial Up Adapter Y TCP IP gt 10 100M PCI Fast Ethernet Adapter TCP IP gt Internet Connection Sharing S File and printer sharing for Microsoft Networks v Add Remove Properties Primary Network Logon Client for Microsoft Networks y File and Print Sharing Description TCPAIP is the protocol you use to connect to the Internet and wide area networks Cancel 11 e Click the properties button A TCP IP Properties box similar to the one below should appear TCP IP Properties 21x Bindings Advanced NetBlos DNS Configuration Gateway WINS Configuration IP Address An IP
7. User Manual Protocol Converter PC E Serial to Ethernet RS232 485 Modbus RTU to Modbus TCP IP BrainChild UMPCEA Rev 1 0 05 2007 COPYRIGHT NOTICE This manual is a publication of Brainchild Electronics Co Ltd and is provided for use by its customers only The contents of the manual are copyrighted by Brainchild Electronics reproduction in whole or in part for use other than in support of Brainchild Electronics equipment is prohibited without the specific written permission from Brainchild Electronics SERVICE If service is required then pack the unit in its original packaging container or if unavailable any suitable rigid container If a substitute container is used surround the unit with shock absorbing material damage in shipment is not covered by the warranty Include a letter with the unit describing the difficulty of usage and request Brainchild for RMA procedure Send the equipment to the following address Brainchild Electronic Co Ltd 6F 209 Chung yong Road Nan Kang Dist Taipei Taiwan R O C Tel 886 2 27861299 Fax 886 2 27861395 Email sales brainchild com tw All returns will be tested to verify customer claims of noncompliance with the product warranty Improper return packaging which makes verification impossible will void the warranty If noncompliance is verified and is not due to customer abuse or the other exceptions described with product warranty Brainchild Electronics will at its op
8. address serial data format and operating modes The web server can be accessed by most web browsers like Internet explorer Netscape etc PC E supports FTP protocol which enables the web pages to be customized if required The web page address for viewing the setup parameters is http 192 168 0 112 index htm the web page address for configuring the converter is http 192 168 0 112 ip htm The master device which is polling the modules must be configured with the IP address of the converter and with the Modbus ID of the Modbus modules As each RS485 network is separate it is possible to have repeated Modbus ID s on the RS485 networks The IP address differentiates between the different RS485 networks Consequently many hundreds of lO modules may be added to an Ethernet network 2 Operating Modes 2 1 Mode 0 Mode 0 is the standard server configuration for most Ethernet serial converter applications This mode has been designed to service multiple sockets which enables up to 4 masters to communicate with the slaves connected to the converter Each socket is serviced in turn and any message in the socket is sent out on the serial port The converter then starts a timer waiting for a reply When a reply is received the messages is put into the initiating socket and send out on the Ethernet network The converter then checks the next socket If no reply is received then the timer expires and the converter checks the next socket This timer is con
9. address can be automatically assigned to this computer IF your network does not automatically assign IP addresses ask your network administrator for an address and then type it in the space below Obtain an IP address automatically Specify an IP address IP Address 192 168 0 113 E Cancel Select the IP Address tab Choose to Specify an IP address as shown in the figure Insert the IP address 192 168 0 113 and the corresponding subnet mask as shown Save your settings by pressing OK in both TCP IP properties and Network properties Reboot your PC 6 5 Connecting to a PC which is connected to a Network If there is an Ethernet network available the Protocol converter can be connected to any hub belonging to the network Please note that PC E is shipped with default IP address of 192 168 0 112 To connect PC E with existing network first IP address of PC E should be changed to free IP address available in the network 1 Contact system administrator and request for free IP address in the network 2 Remove LAN cable 3 Change IP address to the PC as follows IP address 192 168 0 113 Subnet mask 255 255 255 0 Default Gateway 192 168 0 1 Enable the network connection Connect cross over Ethernet cable between PC and PC E Apply Power to PC E Observe that Ethernet link LED Green color is steady on continuously Right side LED shows link activity and you can observe slow flash our 12
10. erviced by the user Service should be performed on a unit substitution basis only Do not attempt to remove replace or service any printed circuit board components or any hardware software related with display product If problem within the display product occurs contact the factory for service information or repair Any Mechanical or Electrical Modification to this Unit will void All Warranties DISCLAIMER Information contained herein is subject to change without notice Every precaution has been taken in the preparation of this manual Nevertheless Brainchild Electronics assumes no responsibility express or implied for errors or omissions or any damages resulting from the use of the information contained in this publication All trademarks belong to their respective owners TABLE OF CONTENTS lz DI A o cs 5 Qe Operating MOS 225 c 20sec EEE AE oye A edad 5 2 1 MOG O a A a dons dace hc iia 5 2 1 1 Modbus gateway Using TCP cccccecscesscssscsseceeessecsecseecaeeeaeesneesneeeeserenseesseeeaeenseenaes 5 2 1 2 Transparent Mode Using TCP iii dci 6 2 1 3 Modbus gateway Using UDP iiciin esii ereire ee E EEE E iseh 6 2 1 4 Transparent Mode Using UDP viii decidi 6 22 Mod A A AA A AA 7 2 2 1 Modbus gateway Using TCP ccecccecscssscssscesecesecesecsecseecseeeseeeneseneeneesrenseesseesseenaeenaes 7 2 2 2 Transparent Mode Using TOP iii deidad 7 2 3 Mod 2 vik A A AA a r a 7 3 Physical Dimensions E
11. figured on the ip htm web page and is labeled Serial Reply Timeout The converter can also accept messages on UDP instead of TCP Operation is the same and does not need any special configuration There are a number of different configurations for this mode as follows 2 1 1 Modbus gateway Using TCP When used as a Modbus gateway the client must be configured to use Port 502 This is a reserved port number for Modbus TCP applications and informs the converter that it must implement the protocol conversion from Modbus TCP on the Ethernet network to Modbus RTU on the serial network 2 1 2 Transparent Mode Using TCP When used in transparent mode the client must be configured to use Port 1234 This port number informs the converter that any data that is received in a socket must be transmitted out the serial port without any protocol conversion 2 1 3 Modbus gateway Using UDP When used as a Modbus gateway the client must be configured to use Port 502 This is a reserved port number for Modbus TCP applications and informs the converter that it must implement the protocol conversion from Modbus TCP on the Ethernet network to Modbus RTU on the serial network 2 1 4 Transparent Mode Using UDP When used in transparent mode the client must be configured to use Port 1234 This port number informs the converter that any data that is received in a UDP datagram must be transmitted out the serial port without any protocol conver
12. her devices which generate electromagnetic radiation Examples of these devices are relays and contactors transformers motor controllers etc This electromagnetic radiation can induce electrical noise into both power and signal lines as well as direct radiation into the module causing negative effects on the system Appropriate grounding shielding and other protective steps should be taken at the installation stage to prevent these effects These protective steps include control cabinet grounding module grounding cable shield grounding protective elements for electromagnetic switching devices correct wiring as well as consideration of cable types and their cross sections 1 Screened twisted pair cable must be used with the screen grounded at one point only 2 Use should be made of screened I O T C RTD cable with the screens grounded at one point as close to the Protocol converter as possible 4 Technical Specification Power Supply PC E 90mA 10VDC 40mA 26VDC Ethernet 10 100 Mbits s 10 100Base TX Connector RJ45 Serial RS232 3 Wire TX RX GND RS485 2 Wire Multi drop twisted pair Baud Rate 2400 4800 9600 19200 38400 57600 115200 Data Bits 5 6 7 8 Parity None Even Odd Stop Bits 1 2 Temperature Operating Temperature 10 C to 50 C Storage Temperature 40 C to 85 C Connectors Power and Comms 8 way screw connector Humidity Up to 95
13. mity Certificate DECLARATION OF CONFORMITY according to EN 45014 Manufacturer s Name Brainchild Electronic Co Ltd Manufacturer s Address No 209 Chong Yong Road Nankang district Taipei Taiwan declares that the product Product Name Protocol Converter Serial to Ethernet Model Number s PC E complies with EMC Directive 89 336 EEC and Low Voltage Equipment Directive 73 23 EEC and conforms to the following Product specifications Safety TEC 950 EMC IEC 61000 4 2 A1 Level 2 IEC 61000 4 3 A1 Level 2 IEC 61000 4 4 Level 3 CISPR 11 1991 A1 EN 55011 1998 Group 1 Class A Taiepi Taiwan May 2007 Mr Peter Lio Location Date Vice President 19
14. of data Request timed out timed out timed out timed out Ping statistics for 192 168 6 112 Packets Sent 4 Received BM Lost 4 10867 C Documents and Settings user gt _ There may be the following solutions to this problem 13 e Check the Ethernet cable between PC and PC E We suggest that it should be cross over cable You should not use LAN cable straight cable for this purpose Check that the Link LED is illuminated when the cable is plugged into the RJ45 connector e Make sure that PC is set with default IP address in the range of default IP address of PC E Ex You can use 192 168 0 113 for the PC e f you wish to use LAN cable only between PC and PC E then make sure that your PC is set with IP address in the range of PC E Set PC with IP address 192 168 0 113 subnet mask 255 255 255 0 6 7 Viewing Web Pages The Protocol converter has built in web pages These are used for changing the configuration To view these Web pages a Web browser such as Internet Explorer or Netscape is needed To view the default Web page in Protocol converter start the Web browser and type 192 168 0 112 into the address line of the browser window The main page of the Protocol converter will now be displayed in the browser window If no Web page is displayed go back to testing the network connection from PC to the Protocol converter by using the ping command If the Protocol converter replies to the ping messages check
15. power has not been switched off it is possible to re enter the correct IP address Please note that if the power has been switched off and back on again the Protocol converter will not communicate until you enter the new IP address into the address line of the browser window e Default Gateway IP Address A default gateway is a node a router on a computer network that serves as an access point to another network In enterprises however the gateway is the computer that routes the traffic from a PC to the outside network that is serving the Web pages It is only necessary to configure the default gateway IP address if the PC that is accessing the Converter is on a different network e Subnet Mask In computer networks a sub network or subnet is a range of logical addresses within the address space that is assigned to an organization The subnet 16 mask is used to inform the Converter that it must send its replies to the gateway if the IP address of the PC is on a different network When the subnet mask is set to 0 0 0 0 then it is effectively disabled and the default gateway is not used A typical subnet mask would be 255 255 255 0 e Socket Timeout If a socket connection is broken say due to a network fault it must timeout to free it up so that it can be used again This timer is triggered by activity on the converter so if there is no communications activity for longer than the timeout period the socket will close g
16. sion Modbus Master 8DI Digital Inputs Ethernet wt RS232 RS485 Modbus Ethernet xs Converter Master Hub Switch r Request r gt Modbus Slaves RS485 Network a r 120 Ohm Termination Digital Outputs Fig Max 4 masters can access data of the lO modules via PC E in Mode 0 That means Mode 0 supports multi socket communications 2 2 Mode 1 Mode 1 is a server configuration and is similar to Mode 0 except that this mode only makes use of a single socket By default Mode 1 for simple applications Ex Access IO modules data in one PC via PC E on Ethernet This single socket implementation waits for messages to come in on the Ethernet network and sends them out the serial port Any messages being received on the serial port are sent out on the Ethernet network As there is only one socket there is no need for the timer as in mode 0 There are a number of different configurations for this mode as follows 2 2 1 Modbus gateway Using TCP When used as a Modbus gateway the client must be configured to use Port 502 This is a reserved port number for Modbus TCP applications and informs the converter that it must implement the protocol conversion from Modbus TCP on the Ethernet network to Modbus RTU on the serial network 2 2 2 Transparent Mode Using TCP When used in transparent mode the client must be configured to use a PORT number chosen by the user This port n
17. t IP Address Windows Internet Explorer er y v http 1192 168 0 112fip htm x X w ke 1P Address Communication Modes 0 Server Standard Mode Multi Socket Converter Mode 1 1 Server Socket Listen Mode Single socket 2 Client Remote Socket Open Mode Single socket Time to wait before sending Rx Chars when Char Timeout 25 using Port 30004 in Mode 0 or using Mode 1 2 X 10 milliseconds Port Number 502 Modbus TCP 502 Mode 1 amp 2 only Server IP 192 fise Jo 240 Mode2only e Converter Mode These modes have been described in detail in a section 2 Enter 0 1 or 2 as required For simple applications say Data Acquisition Studio software in PC is Master and IO modules are RTU slaves then select 1 e Char Timeout This timeout has been described in detail in a section 2 Enter a value in 10millisecond increments e Port Number The Port number used to tell the converter that the incoming TCP UDP message must get sent to the serial port e Server IP The client converter in mode 2 must connect to the server converter Enter the IP address of the server converter in this field 17 IP Address Windows Internet Explorer Ge Jv http 192 168 0 112 ip htm Y k Er Address vt x A A E gt re RS232 RS485 Communications Port Parameters Baud Rate 9600 Data Bits la I Parity lo m Stop Bits 19 RS232 RS485 10 a RS485 On Delay o RS485 Of Delay o
18. t be used Yes A network connection is detected the Protocol converter is connected to the network No Does the Protocol converter respond to PING requests Either the PC or the Protocol converter is setup with wrong IP address Set PC E with default IP address To change the IP address of a PC use the Windows control panel gt network gt TCP IP properties and setup an IP address close to the Protocol converter address The Protocol converter is shipped with a default IP address of 192 168 0 112 the PC can be setup with an IP address of 192 168 0 113 Yes The PC and Protocol converter are setup with a correct IP address and they are able to communicate with each other Can the default Web page No be accessed in a Web browser This is normally caused by the setup of the Web browser In the options or preferences menu check that the Web browser is configured for direct network connection or local area network and NOT using a proxy server Yes No problems Are the LINK LED and ACTIVITY LED flashing Yes Switch off the power to PC E Wait for some time before switching on the power for next time together No No Problems Procedure to set PC E to default IP address a Remove power b Remove Default IP jumper c Plug in Ethernet cable and connect to switch d Apply power e After about 2 seconds the link LED should come on and must no
19. t flash LED closest to green connector f Replace jumper 15 6 9 Parameter Configuration The Web page address 192 168 0 112 ip htm is entered into the address line of the browser window to access the configuration page This page allows you to change the IP address of the Protocol converter select serial timeout to setup the baud rate of the Protocol converter on the RS485 network and to enter a Module Description Name for identification maintenance purposes gt IP Address Windows Internet Explorer y http 11192 168 0 112fip htm Sl bell eas EJE ji gt we e IP address RA a Page iG Tools 12 BrainChild Serial Ethernet Converter PC E Ethernet Configuration Parameters Module IP 192 fies Jo 12 Default Gateway IP Subnet Mask 265 255 255 Jo E Socket Time Out 90 X 1 second 192 fes Jo f e IP Address The new IP address can be entered into the web page as shown above After this has been done you must click the Submit button to send the values to the Protocol converter The screen will now be updated and if successful will continue to display the new IP address The new IP address will only be effective after the Protocol converter power has been switched off and on again This feature allows you to check that the correct IP address has been entered before being activated If the IP address has been entered incorrectly and the
20. the setup of the Web browser If the Protocol converter is directly connected to the same network as the PC direct connection to the network or bypass proxy server for local addresses should be selected in the Web browser configuration menu If the Protocol converter is connected to the PC through a firewall a proxy server should be selected in the configuration menu Contact the local network administrator for information about the network configuration MODBUS TCP RS485 Converter Windows Internet Explorer EJ yy le http 192 168 0 112 x gt X Pl Y ane mopsus TCP R5485 Converter ai 5 mm Page Of Tools BrainChild Serial Ethernet Converter PC E Module Name PC E Baud Rate 9600 8 0 1 MAC Address 50 c213 2f7a Welcome to the Brainchild MODBUS TCP Converter home page This converter is used to connect an Ethernet network to a RS485 232 network and converts the Modbus TCP protocol to the standard Modbus RTU serial protocol on RS485 232 14 6 8 Troubleshooting Guide No Checkpoint Solution Is the LINK LED on and is the ACTIVITY LED flashing with short pulses No No network connection is detected The Ethernet cable is either not plugged in or wrong type of cable is used For connection to a network with a hub or switch a straight through network cable can be used For direct connection between PC and Protocol converter a cross over Ethernet cable mus
21. tion repair or replace the Product returned to it freight prepaid which fail to comply with the foregoing warranty provided Brainchild is notified of such noncompliance within the one year warranty period ASSISTANCE This manual is designed to provide the necessary information for trouble free installation and operation of your new Serial to Ethernet Protocol converter However if you need assistance please call Brainchild Electronic Co Ltd at 886 2 27861299 Ext 613 Or visit our web site at www Brainchild com tw MANUAL REVISION If you contact us in reference to this manual please include the following document number Name User Manual for PCE Document UMPCEA 05 2007 Revision 1 0 Warranty Certificate For New product This product is warranted against defects in materials and workmanship for a period of 12 months from the date of shipment to Buyer For Rectified Products Any product that will be replaced will have Warranty for 6 months or up to Original Product Warranty period whichever is greater The warranty is limited to repair or replacement of the defective unit at the option of the manufacturer This warranty is void if the product has been altered misused dismantled or otherwise abused ALL OTHER WARRANTIES EXPRESSED OR IMPLIED ARE EXCLUDED INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE MAINTENANCE amp SERVICE There are no parts that can be s
22. umber informs the converter that any data that is received in a socket must be transmitted out the serial port without any protocol conversion and must not be one of the reserved numbers 21 ftp 80 http 502 Modbus This is the mode that is used to create a transparent point to point serial Ethernet serial link with a client converter 2 3 Mode 2 Mode 2 is a Client configuration and is used to make a transparent link with a server converter This mode only makes use of a single socket This single socket implementation waits for messages to come in on the Ethernet network and sends them out the serial port Any messages being received on the serial port are sent out on the Ethernet network As there is only one socket there is no need for the timer as in mode 0 When messages are received on the serial port they are sent out on the Ethernet network Due to the fact that the Ethernet network is normally faster than the serial data being received the serial message being received will get broken up into small blocks and then sent on the Ethernet network This could result in the Ethernet network being flooded with many messages sending one or two characters at a time To prevent this from happening a timer is used This timer starts when the first character is received on the serial port and when it expires any received characters in the serial port buffer are sent out on the Ethernet network This timer is disabled if a value of 0 is programmed

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