Differences
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Converter type
Serial ports
Interfaces
GSM Modem
Wireless communication
Device features
I/O
Module type
Simple device
Programmable converter
RS-232
RS-422
RS-485
USB
GPRS
GSM Modem
Programmable
Isolated input
Industrial modem
ATC-840
 
 
 
 
 
 
 
 
ATC-850
 
 
 
 
 
I-7561
 
 
 
 
 
I-7561U
 
 
 
 
iMod-94XX-EDGE
 
 
 
 
 
 
 
 
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