Crestron AV2 & PRO2 2-Series Integrated Dual Bus Control System
Non-Standard COM Pinout
PIN DIRECTION DESCRIPTION
1* To AV2 or PRO2 (RXD-) RS-422 Receive Data (Idles low)
2 To AV2 or PRO2 (RXD) RS-232 Received Data
3 From AV2 or PRO2 (TXD) RS-232 Transmitted Data
4 From AV2 or PRO2 (TXD+) RS-422 Transmit Data (Idles high)
5 RS-232 and RS-422 Signal Common
6 To AV2 or PRO2 (RXD+) RS-422 Receive Data (Idles high)
7 From AV2 or PRO2 (RTS) RS-232 Request to Send
8 To AV2 or PRO2 (CTS) RS-232 Clear to Send
9 From AV2 or PRO2 (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
INFRARED – SERIAL OUTPUT
These connectors provide eight serial outputs for IR or serial interface. Each output
is labeled S (signal) and G (ground). Infrared output is rated up to 1.2 MHz, at data
rates up to 115K. Serial protocols include one-way RS-232. For detailed information,
refer to “Slot 5: C2I-IR8” on page 29.
A B C D
E F G H
S G S G S G S G
INFRARED - SERIAL OUTPUT
S G S G S G S G
NOTE: Transmission levels on the infrared – serial output connectors are in the 0 to
+5VDC range, which may not be compatible with all RS-232 devices.
I/O
On the rear panel there are eight software programmable analog and digital inputs as
well as digital outputs. Digital outputs offer 250mA sync from maximum 24 VDC;
catch diodes for use with "real world" loads. Digital inputs are rated 0 – 24 VDC,
20K ohms input impedance, logic threshold 1.25 VDC. Analog inputs are rated 0 –
10 VDC, protected to 24 VDC maximum, 20K ohms input impedance; pin-
programmable 2K ohms pullup resistor to +5V. For detailed information, refer to
“Slot 6: C2I-IO8” on page 29.
S6
I/O
1
2
3
4
5
6
7
8
G
NOTE: Digital outputs are TTL values and may not work with devices requiring a
“dry” contact closure (e.g., low voltage motor controllers).
RELAY OUTPUT
RELAY
S7
1
2
3
4
OUTPU
5
6
7
8
These connectors provide eight normally open, isolated relay contact groups. Each
relay contact closure is rated 1A, 30 VAC/DC; MOV arc suppression is provided
across contacts for use with "real world" loads. For detailed information, refer to
“Slot 7: C2I-RY8” on page 32.
Operations Guide - DOC. 5957A Integrated Dual Bus Control System: AV2 & PRO2 • 7
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