Digi Sm320 Service Manual

Connect a PC to the RS-232 console port (often labeled “DIAG” – use 9600 baud, not 115200, if standard user guide). Boot log should show:

Digi SM320 bootloader v1.2
DRAM: 64 MB
Flash: 16 MB
Cellular module: Sierra MC8775

If no output – check MAX3232 UART driver. digi sm320 service manual

The service manual often concludes with a maintenance schedule to prevent failures before they occur: Connect a PC to the RS-232 console port

If you lack the original, follow this generic repair workflow for the SM320: If no output – check MAX3232 UART driver