| Connecting wavecom M1213A (15 pins) to computer (9 pins)... |  Search
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NowSMS Support Forums ⬆ MMS & SMS Technical Discussions (unsupported) ⬆ Archive through November 21, 2009 ⬆ |
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| Author | Message | |||
| Matthew Udomphol New member Username: Ghsrocketman Post Number: 1 Registered: 03-2009 |
Hello I'm somewhat new (okay very new) to these GSM modems. I just bought the M1213A off of eBay and am quite confused about the pinout connections. In the user manual, pins are described as follows: RS232 Pin - Designation 1 - DCD - Data Carrier Detect 6 - RX - Receive Data (out) 2 - TX - Transmit Data 8 - DTR - Data Terminal Ready 9 - GND - Signal ground 7 - DSR - Data Set Ready 12- RTS - Request to send 11- CTS - Clear to send 13- RI - Ring indicator On wikipedia, RS-232 communication is described as follows: 5 - G 3 - TxD 2 - RxD 4 - DTR 6 - DSR 7 - RTS 8 - CTS 1 - DCD 9 - RI I'm assuming these pins just match up based on name. However, I just want to make sure that the "receive data" on the modem is NOT supposed to be paired up with the "transmit data" on the PC, right? Thanks! | |||
| Des - NowSMS Support Board Administrator Username: Desosms Post Number: 643 Registered: 08-2008 |
Hi Matthew, I honestly don't know what the correct PIN outs are. But a basic serial 9 to 25 pin converter should do the trick for you. You want a normal "straight through" cable ... not a "null modem" or "crossover" cable which would crosslink transmit and receive. Null modem or crossover cables would be specially labeled. A basic 9 to 25 pin serial cable should do the trick ... something like this: http://www.monoprice.com/products/product.asp?c_id=102&cp_id=10212&cs_id=1021203 &p_id=469&seq=1&format=2 | |||
| Des - NowSMS Support Board Administrator Username: Desosms Post Number: 644 Registered: 08-2008 |
Oops ... wrong cable ... I chose a serial printer cable instead of a serial modem cable. I'm not sure if there's a difference or not, but here's a link for 9 to 25 pin modem cable: http://www.monoprice.com/products/product.asp?c_id=102&cp_id=10212&cs_id=1021202 &p_id=462&seq=1&format=2 | |||
| Matthew Udomphol New member Username: Ghsrocketman Post Number: 5 Registered: 03-2009 |
Des, Does your product interface through the parallel port (25-pins, right) as well? Matt | |||
| Des - NowSMS Support Board Administrator Username: Desosms Post Number: 665 Registered: 08-2008 |
Hi Matt, 25 pin serial port (e.g., COM1: ), yes ... parallel port (e.g, LPT1: ), no. I don't think a modem would let you connect it to parallel port ... I think that is for old printers only. -- Des NowSMS Support | |||
