Crestron
CNMSX
Integrated Control System
This may result in a conflict with some equipment and therefore do not use all nine
pins. Only the required pins for each communication type should be connected.
NOTE:
To support RS-485, tie pin 1 (RXD-) to pin 9 (TXD-) and pin 4 (TXD+) to
pin 6 (RXD+) in the cable (refer to table after this note, titled “COM Pinout to RS-
485 Bus”.
Non-Standard COM Pinout
PIN
DIRECTION
DESCRIPTION
1*
To CNMSX
(RXD-) RS-422 Receive Data (Idles low)
2
To CNMSX
(RXD) RS-232 Received Data
3
From CNMSX
(TXD) RS-232 Transmitted Data
4
From CNMSX
(TXD+) RS-422 Transmit Data (Idles high)
5
RS-232 and RS-422 Signal Common
6
To CNMSX
(RXD+) RS-422 Receive Data (Idles high)
7
From CNMSX
(RTS) RS-232 Request to Send
8
To CNMSX
(CTS) RS-232 Clear to Send
9
From CNMSX
(TXD-) RS-422 Transmit Data (Idles low)
Where: *= RS-422 transmit and receive are balanced signals requiring two lines plus a ground in each
direction. RXD+ and TXD+ should idle high (going low at start of data transmission). RXD-
and TXD- should idle low (going high at start of data transmission). If necessary, RXD+/RXD-
and TXD+/TXD- may be swapped to maintain correct signal levels.
COM Pinout to RS-485 Bus
COM (DB9) CONNECTOR
RS-485 BUS
Tie Pins 1 & 9
-
Tie Pins 4 & 6
+
Pin 5
G
COMPUTER
Computer Connectors
These 9-pin DB9 female connectors (one on front panel and one on rear) are used
when programming with a PC. Each port is modem compatible. The modem cable is
not included.
100 - 250V ~ 2.3A 50/60 Hz (Power Supply)
Universal Power Supply Connector
On the rear panel there is an internal universal power supply connector. Use the
supplied power cord to connect to an AC outlet.
Operations Guide - DOC. 8118B
Integrated Control System: CNMSX
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