RS232 Wiring Considerations
• Since the RJ11 connector and the screw block terminal use the
same signal source, only one can be used for establishing
RS232 communications.
• Connect the screw block terminal as follows:
• M90-19-R4 Device
• RxD <--------- TxD
• TxD ---------> RxD
• 0V ---------- 0V
RS485 Wiring Considerations
• Use shielded, twisted pair cables.
• Configure the network as a multidrop bus network.
• Minimize the stub (drop) length leading from each device to
the bus.
• Ideally, the main cable should be run in and out of the
networked device.
• Do not cross positive (A) and negative (B) signals.
• Positive terminals must be wired to positive
• Negative terminals must be wired to negative.
Figure 2-8. R-J11 Pin-out
2-8
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