Sierra Modem HL7800

Projects Networking, Protocols, and Devices
2

have a read of how-to-get-the-best-out-of-this-forum
in particular

  1. what host microcontroller are you using?
  2. upload a schematic showing the wiring and powersuppliy

can you send AT commands and reseive a response, e.g.

at
OK
at+cgmi
SIERRA
OK
at+cgmm
HL6528
OK
at+cgmr
SIERRA HL6N,000.16
OK