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CM4 Four-Point Continuous Monitor
Computer with multiple
Communication Ports
Multiple CM4 monitors and a single computer
Bi-Directional Communication over a 2-wire system
Female DB-9
to Computer
(B) TX/RX+
(A) TX/RX-
Ground
Address
000
For ground, use another conductor in the cable; do not use the shield or drain wire
Interface
RS-232 P/N 874327-R Rear Panel Mount
Computer Port Customer-supplied; check user device for compatibility before ordering.
Cable
User-supplied. Refer to diagram for pinout configuration. Drop distance between
the CM4 and the daisy-chain cable should be as short as possible (less than
three feet).
Refer to EMC Considerations section on page D-2.
Protocol
Customer-written per information in Appendix E.
Note
Refer to the computer port documentation for specific pinout information for the
computer's RS485 interface.
RS485 ports are limited to 32 nodes due to drive-level limitations. The number of
nodes per port can be extended up to 255 by use of RS485 repeaters.
Figure E-3: Bidirectional Communication, Single Computer, Multiple CM4s
over a two-wire system.
CM4 Technical Manual
CM4
RS-422
Monitor
CM4
RS-422
Monitor
CM4
RS-422
Monitor
CM4
RS-422
Monitor
Maximum of
32 CM4 Monitors
Male DB-9
Male DB-9
Male DB-9
to CM4
to CM4
to CM4
2
2
2
3
3
3
7
7
7
Address
Address
Address
001
002
Last
Cable Pinout
E-32
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