Appendices ~ Appendix B: Pinouts
84Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Appendix B: PinoutsRS-232 COM DCE port pinout (female)
Pin Number Control Pin Number Control
1 DCD 6 DSR
2 TXD 7 CTS
3 RXD 8 RTS
4 DTR 9 No connection
5 Ground
1
5
6
9
Figure B.1. RS-232 connector

PC

PSR1212

DB-9
Male
DB-9
Female
TXD (Pin 2)
RXD (Pin 3)
DTR (Pin 4)
GND (Pin 5)
CTS (Pin 7)
RTS (Pin 8)
TXD (Pin 2)
RXD (Pin 3)
GND (Pin 5)
CTS (Pin 7)
RTS (Pin 8)
Pin 6
Pin 9
Pin 4
Pin 1
Pin 9
Pin 6
Pin 1
PSR1212 Modem
Pin 3
Pin 2
Pin 3
Pin 7
DB-9
Male
DB-25
Female
Pin 5
Pin 2
AMXPSR1212
TXD (Pin 2)
RXD (Pin 3)
GND (Pin 5)
RX2 (White)
TX2 (Red)
GND (Black)
DB-9
Female
Phoenix
Connectors
CTS (Pin 7)
RTS (Pin 8)
RTS2 (Green)
CTS2 (Blue)
AMXModem
DB-25
Female
DB-9
Male
TXD (Pin 2)
RXD (Pin 3)
GND (Pin 5)
CTS (Pin 7)
RTS (Pin 8)
DTR (Pin 4)
TXD (Pin 2)
RXD (Pin 3)
RTS (Pin 7)
GND (Pin 6)
RTS (Pin 20)
CTS (Pin 4)
GND (Pin 5)
Figure B.2. PSR1212 to PC RS-232 connections Figure B.3. PSR1212 to Modem RS-232 ConnectionsFigure B.5. Modemto AMX RS-232 ConnectionsFigure B.4. PSR1212 to AMX RS-232Connections

ClearOne recommends that

all nine pins be connected to

avoid communication errors.

!