sadyrbek Posted November 28, 2008 Share Posted November 28, 2008 Hi, I have Westermo TD-32B industrialized dial modem which receieves and transfers data through telephone line. Can I use Daqfactory to call this modem and make connection to my devices. If it is possible, could you help me? My device protocol is modbus. I attached manual of the modem. Thank you. TD_32_6178_2203.pdf Link to comment Share on other sites More sharing options...
AzeoTech Posted November 28, 2008 Share Posted November 28, 2008 This modem uses the Hayes AT command set. So, you can just use the Write and Read functions on the serial port to dial. You'd could probably get away with just creating a single serial device with the Modbus protocol selected. Lets say you called it "remote", it'd go something like this: private string response // dial: device.remote.write("ATDT 555-1212") // wait for connect: response = device.remove.read(8) if (response == "CONNECT") device.remote.write("ATO0") // go into data mode private datain // read single modbus value and stick it into a channel datain = device.remote.readholdingU16(1,0,1) mychannel.addvalue(datain) device.remote.write("+++") // go to command mode delay(1) // required delay after +++ device.remote.write("ATH") // hangup endif That's the general jist of it. You'll want some error handling. If the modem can't connect the read(8) will throw an error. You'll also need to increase your timeout so that it has time to connect, or repeat that read(8) a number of times. There are probably some other details that you'll have to figure out, mostly dealing with delays, and what the modem responds with. Although pretty much every modem I know of uses the Hayes AT command set, they all have slightly different personalities and getting the best response from them requires a little playing. Check out the examples at the end of the manual you sent on other commands you may want to send to setup the modem. Link to comment Share on other sites More sharing options...
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