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Ethernet RS-232/422 COM Module Crestron CEN-COM

COM A / B

These two 9-pin connectors (DB9) connect to serial equipment. These bidirectional

serial ports are used for RS-232, RS-422, or RS-485 communication.

NOTE: The pinout of each 9-pin port is non-standard (refer to table after this note);

it contains RS-422 pins in addition to RS-232. 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, as shown below.

CEN-COM Pinout (COM A / B)

PIN DIRECTION DESCRIPTION

1* To CEN-COM

(RXD-) RS-422 Receive Data (Idles low)

2 To CEN-COM

(RXD) RS-232 Receive Data

3 From CEN-COM

(TXD) RS-232 Transmit Data

4 From CEN-COM

(TXD+) RS-422 Transmit Data (Idles high)

RS-232 and RS-422 Signal Common

6 To CEN-COM

(RXD+) RS-422 Receive Data (Idles high)

7 From CEN-COM

(RTS) RS-232 Request to Send

8 To CEN-COM

(CTS) RS-232 Clear to Send

9 From CEN-COM

(TXD-) RS-422 Transmit Data (Idles low)

* RS-422/RS-485 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.

Ethernet (on front panel)

This unmarked RJ45 modular connector provides Ethernet connection, thereby

making the unit IP addressable and compatible with 10BASE-T Ethernet systems.

The Ethernet port is the standard 10BASE-T pinout. Refer to the pinout table after

this paragraph.

4 • Ethernet RS-232/422 COM Module: CEN-COM Operations Guide - DOC. 5719

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