64 Rockwell Automation Publication 2080-UM002K-EN-E - March 2019
Chapter 5 Communication Connections
Use Modems with
Micro800 Controllers
Serial modems can be used with the Micro830, Micro850, and Micro870
controllers.
Making a DF1 Point-to-Point Connection
You can connect the Micro830, Micro850, and Micro870 programmable
controller to your serial modem using an Allen-Bradley null modem serial cable
(1761-CBL-PM02) to the controller’s embedded serial port together with a
9-pin null modem adapter – a null modem with a null modem adapter is
equivalent to a modem cable. The recommended protocol for this configuration
is CIP Serial.
Construct Your Own Modem Cable
If you construct your own modem cable, the maximum cable length is 15.24 m
(50 ft) with a 25-pin or 9-pin connector. Refer to the following typical pinout for
constructing a straight-through cable:
DTE Device
(Micro830/850/870
Channel 0)
DCE Device
(Modem, etc)
niP-9niP-52niP-8
32DXTDXT7
23DXRDXR4
57DNGDNG2
18DCD)+(B1
402RTD)-(A8
66RSDDCD5
85STCSTC6
74STRSTR3
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