Trizium Evaluation Board - RS232 Problem!

Wireless & IoT
1

I had just bought the ‘Trizium Evaluation Board - RS232’ from Sparkfun. Apparently, I understand that the Trizium module is a SMD version of the GM862 module and that the evaluation board has a build-in power supply, RS232 level shifter, on/off button and a SIM card adaptor.

I connected a 5VDC wall wart power supply to the evaluation board and connected a serial cable from the board to my PC COM1 port. I then started a terminal software in my PC with the following settings - COM1, 9600 bps, 8 bits, No Parity, 1 Stop bit. When I press the on/off button on the evaluation board the message in the hyperterminal is <0>.

I tried sending the command ATZ but the same ATZ message is echoed back and then no response. I was expecting OK response from the board.

I then tried ATD 12345678 command to dial out but the board just echo back the same message that I send and then no response. After sending the message ATD 12345678 a few times the board send back ERROR message.

Please give me some guidelines how to start as I am new. I am totally lost.

HC Wong

2

First command you want to send is AT. AT will let it automatically detect your buadrate. If the board responds OK from that, you’re in business.

If you are in north america, the next command to send is AT#BND=1 … this will put the module on the only frequency it’s compatible with in the US. This command will respond OK if it was successful.

After that, try using AT+CPIN to check if it sees your sim card.

Now try AT+CREG to see if you are attached to a network. A response of 0,1 or 0,5 means you are good to go.

Now you can make a call with ATD or send data with AT#SKTOP

Good luck and let us know how that goes.