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4–4
If you are connecting a 1785-KE module to a device not manufactured by
Allen-Bradley, then you must mount the module within 50 cable feet of
that device. For such applications, the module’s GND must be connected to
the GND of the modem or computer. RXDRET must be jumpered to GND
at the module. TXDRET should be left open. Note that this type of
connection does not provide electrical isolation between the module and
the connected device.
The following sections provide guidelines for cabling your 1785-KE to:
a computer
another Allen-Bradley communication module
a modem