I recently got a GPS eval board, GPS-08334, and connected an EM-408 receiver to it. I’m able to receive data from it just fine.
I would now like to send some commands to control it, but I’m not able to get the unit to respond to anything I s-e-n-d. I’ve tried via the first serial port and via USB, and neither causes any output. I’ve turned debugging on (or tried to), with no effect. Whether I send commands which are properly formatted or not, no effect. I’ve opened the USB and serial ports in a terminal emulator and typed ^M^J, real commands, bogus commands, all to no effect. AFAIK, everything I send goes into a black hole.
The USB is a bit out of my power to check, but I verified that all of my serial hardware is working correctly and that I am able to send bytes via serial, so I am convinced that, when using serial port 1, my bytes are getting to the pins that port.
Do you guys have any suggestions? Is the TX pin of the serial port and of the USB-to-serial chip connected to the GPS module? Would anyone have any example output of what the debug mode should print, both on valid and invalid commands?
The first of these boards I got was missing a battery clip; on the replacement, I can see a surface mount component by the status LED which isn’t soldered correctly. Status LED never lights up, btw, even after a fix is obtained. Maybe the build quality of these boards is the problem?
(Really? S-e-n-d flags a post as spam?)