Serial to Ethernet Converter Features Applications Specifications ...

For more products visit our website http://www.sunrom.comDocument: Datasheet Date: 28-Mar-13 Model #: 1254 Product’s Page: www.sunrom.com/p-1231.htmlSerial to Ethernet ConverterThis is an embedded TCP/IP server whichhave a configurable IP address and a UARTconnected virtually over ethernet/LAN. Yourapplication can use it as alternate to a PCconnected COM port as it creates a virtualCOM port on PC which is infact connectedover LAN to this board.Features• Board is embedded TCP/IP Server• Creates Virtual COM port on PC• Tx/RX Indicating LEDs• Simple to use• Can connect with any MCU(3-5V)TX/RX pins directlyApplications• Remote Logging• Data Acquisition and Controlling• Virtual COM port over ethernetSpecificationsParameter Value DetailsOperation Voltage +5V Regulated +5V requiredOperating Current250mAUART Level 3-5V Can work directly with 3V or 5V MCU pinsUART baud rateFrom 9600 Configurable, All standard baud rates supported(8 bit data, no parity, 1 stop bit) To 115.2 kbpsTypical SetupYour MCU51,AVR,PIC,ARMSerial to EthernetModule: 1254LANPCVirtual Com PortConnected toSerial to EthernetBoard: 1254

PinoutsPin Pin Name DetailsRX-I Receive Input Input serial data of 3-5V logic level, Usually connected to TXD pin ofmicrocontrollers/PC/RS232.TX-O Transmit Output Output serial data of 5V logic level, Usually connected to RXD pin ofmicrocontrollers/PC/RS232.+5V Power Supply Regulated 5V supply input. Board has LM1117-3.3V regulator topower all parts.GND Ground Ground level of power supply. Must be common ground withmicrocontroller / USB / MAX232 board.LED StatusThere are three LED on board, which has below meaningsGreen LED indicates power okYellow LED indicates that data is being received from ethernet and sent to its UART pin. This LEDis located on the TX-OUT pin itself indicating actual data being sent to its TX-OUT pin.Red LED blinks every second when CONFIG mode is on using on board jumper.When not in CONFIG mode, Red LED blinks when byte is transmitted to ethernet. This only blinkwhen a client is actually connected over TCP else RED led does not blink.Typical ApplicationLets us consider a typical application in which we have a microcontroller board whose UART pinsTX, RX data we want to access on PC using the serial to ethernet board from sunrom model 1254AVR, PIC, 8051 etcMCU with TX,RXpins of UARTTXRX+5VGNDSunrom Serial toEthernet Board 1254LAN Cable to PC ethernet portorLAN Network through routerRemote PC wants to access UART of MCU, it needs1) Virtual Serial port software(Provided on CDROM) which connects to remote module IPand creates a com port on PC to which the remote data is sent and received.2) Any Serial Terminal software to view or send remote serial data on the COM portcreated by above software. (Can be custom software also)3) Or you can use any TCP Terminal softare like PUTTY which can make remote TCPconnection as client if you are bypassing Serial terminal software option.2Sunrom Technologies Your Source for Embedded Systems Visit us at www.sunrom.com

Configure IP and Baud RateTo change module’s IP address or baud rate of operation. This step is optional unless you want tochange the Board’s IP, else you can skip and test using default board IP.Power off modulePut jumper to config ON mode, In picture below its OFF mode for normal operation.Connect to PC using serial port (Needs MAX232) or USB to Serial TTL converter.Start software from provided CDROM as below, Read/Write setting as required. This is a one timeprocess. Once you write to module it always remembers in its internal memory even after power off.Default module configuration is as below, you can change it.3Sunrom Technologies Your Source for Embedded Systems Visit us at www.sunrom.com

Getting StartedPing the modulePing is the basic step to see if your PC can reach the board. If it does then all software or driverscan access it from PC.1) First set PC's IP to static that means 192.168.1.21 its incremented one unit more than thedefault module IP of 192.168.1.20, We set PC’s IP in same range as module so PC can pingthe module easily.2) Use the ethernet cable provided with product and connect to PC LAN port3) Power on board4) Go to Start Menu > CMD will start command prompt5) In black command prompt write ping 192.168.1.20 –t6) If you get ping command not found error then start CMD from run as right click run asadministrator7) The –t parameter tells the ping command to keep pinging till cancel(CTRL+C), else it pings 3times only and stops8) When you are able to see response received text it means module is responding to ping andthe IP set in module is working.9) If you get time out message in ping it means that your PC is not in same range as module IPor board is not powered on or board is in config on module. You need to put jumper in configoff mode for ethernet to work.Note: Setting of PC IP to static is only required to ping easily, if you have a router and have set yourethetnet module IP config in same range as router assigned IP address then static IP to PC is notrequiredInstalling Virtual serial port on PC1) Software to install a virtual port on PC connected over IP is provided on CDROM.2) Install software from folder and then do setup of com port.3) Screenshot on how to set the software its named software_config.jpg on cdrom.4) This software will do two thingsa. Connect to remote module as client over TCP and listen to incoming packetsb. If packets arrive over TCP/IP they are directed to PC’s virtual com port created duringsetupc. If some one tries to send data to this PC’s virtual com port then the same data isdirected towards remote TCP/IP of boardd. Basically this software creates a link betweeni. Remote module of ethernetii. Creates virtual COM port on PC to which data transfer can take placeNote: It optional to use this software to create Virtual com port on PC through which other softwarecan access the remote board as a COM port. Instead you can make direct connection through TCPin your software as following page shows.4Sunrom Technologies Your Source for Embedded Systems Visit us at www.sunrom.com

Testing with PUTTYPUTTY is a terminal which can connect as client to remote server. We can use this software to testthe board. Instead of using Virtual COM port, we connect as client directly to board IP address. Youcan use this concept to make your own custom software that communicates directly to board.Start PUTTY and it will ask to give IP of board and port number, Use following info to connect toboard’s default IP address.Click open and following window open, you can write to transmit or see data which is received.Before you proceed with it, make sure you can ping your board from PC as shown in earlier pageelse the PUTTY cannot connect.Download Link for PUTTY http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html5Sunrom Technologies Your Source for Embedded Systems Visit us at www.sunrom.com

PC side Terminal softwareTo test and connect to PC you can use either a simple MAX232 circuit to convert display’s TTL levelof 5V to RS232 level of +12/-12V or you can use a USB to TTL UART board. Either way you canget a serial port on PC to connect to and send commands.We recommend this software which can be used test display by sending serial data from PC side.Download it from http://www.sunrom.com/files/Terminal.exeResponse is shownhere as ASCIIResponse in HEXWrite string directly here to send6Sunrom Technologies Your Source for Embedded Systems Visit us at www.sunrom.com

Interfacing with microcontrollerIt’s very easy to interface with microcontroller having UART at 3V or 5V level. Configure yourmicrocontroller to communicate at baud rate set in module (default 9600).Before approaching to this, we recommend you try on PC first with terminal software.VCCTTL UART INTERFACINGVCCC810uF 16VR110K39383736353433321234567831+9U2AT89S52P0.0/AD0P0.1/AD1P0.2/AD2P0.3/AD3P0.4/AD4P0.5/AD5P0.6/AD6P0.7/AD7P1.0/T2P1.1/T2EXP1.2P1.3P1.4/SSP1.5/MOSIP1.6/MISOP1.7/SCKEA/VPPRSTGND20VCC 40XTAL119C1100nP2.0/A8P2.1/A9P2.2/A10P2.3/A11P2.4/A12P2.5/A13P2.6/A14P2.7/A15P3.0/RXD 10P3.1/TXD 1112P3.2/INT013P3.3/INT114P3.4/T015P3.5/T116P3.6/WR17P3.7/RDXTAL2182122232425262728PSEN 29ALE/PROG 30Y1U4Sunrom Serial to Ethernet Converter Model#1254RX-INTX-OUT+5VGND4321VCCC933p11.0592C1033p7Sunrom Technologies Your Source for Embedded Systems Visit us at www.sunrom.com

Interfacing with RS232If you wish to interface the module with RS232 level like a PC serial port or any other device youneed a level convertor such as MAX232 as shown below.U5Sunrom Serial to Ethernet Converter Model#1254RX-INTX-OUT+5VGND4321VCCRS232 INTERFACINGC1310uF 16VC1410uF 16VInterfacing to USB Port and Powering from USB Port++VCC1191210132U6MAX232T1INR2OUTR1OUTT2INC+VCCVCC 16GNDT1OUTR2INR1INT2OUTC2+C1-C2-V+ V-15C16100n148137456++C1210uF 16VC1510uF 16VP2DB9-CONN-F162738495You can also use ourMax232 Board Model 1104http://www.sunrom.com/p-245.htmlU9Sunrom Serial to Ethernet Converter Model#1254U8USB to Serial Board SUNROM#1151/1192RX-INTX-OUT+5VGND4321RX-INTX-OUTGND+5V1234You can use ourUSB to Serial BoardModel 1151 or 11921151 model plugs in directly to USBport of PCUSB INTERFACINGOur USB to Serial TLL will appear as virtual serial port on PC towhich you can communicate through any software which cantransmit receive by this serial port like hyperterminal orcustom made software.http://www.sunrom.com/p-244.htmlSimilar model to above but needs aUSB A-B Type cablehttp://www.sunrom.com/p-1145.html8Sunrom TechnologiesYour Source for Embedded SystemsVisit us at www.sunrom.com

Our Package ContainsSerial to Ethernet Board (Assembled and Tested)Lan Cable 3 Meter longCDROM containing manual+config software+virtual COM port software9Sunrom Technologies Your Source for Embedded Systems Visit us at www.sunrom.com