Key Management Systems Ltd
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P a g e
Communications Module Overview
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SIMPLEKEY 4
CM 4G
(c) 2019
See L ED key
The above drawing depicts a typical 4G Modem-only variant of the CM-4G. There are
no ethernet or auxiliary RS232 / RS485 communication ports.
Communications Module LED Key
Communications status
Comms Status LED KEY
M odem being c onfigured
M odem has no SIM c ard
G atheri ng lis t of op erators
Regi stering on cell ular
network
Establi shing dat a
co nnection
Dat a c onnect ion
establi shed
Fau lt c onditio n
No m odem detected