User`s guide

100 007-4403-003
7: Configuring and Using External Devices
Figure 7-1 DB-9 Pinouts for RS-232 and RS-422 Protocols
Table 7-3 describes the pin assignments for the RS-232 and RS-422 protocols.
Table 7-3 DB-9 Pin Assignments
Pin RS-232 Mode RS-422 Mode
1 DATA CARRIER DETECT (DCD) RESERVED
2 RECEIVE DATA (RXD) RECEIVE DATA (RXD)
3 TRANSMIT DATA (TXD) TRANSMIT DATA (TXD)
4 DATA TERMINAL READY (DTR) TRANSMIT DATA+ (TXD+)
5 GROUND SIGNAL GROUND
6 DATA SET READY (DSR) RECEIVE DATA+ (RXD+)
7 REQUEST TO SEND (RTS) OUTPUT HANDSHAKE (HSK
o
)
8 CLEAR TO SEND (CTS) INPUT HANDSHAKE (HSK
i
)
9 NOT CONNECTED RESERVED
Pin 7
Request to
Send (RTS)
Pin 3
Transmit
Data (TD)
Pin 2
Receive Data
(RD)
Pin 4
Data Terminal
Ready (DTR)
(not used)
Pin 5
Ground
Pin 9
Ringing Indicator (RI)
(not used)
Pin 8
Clear to Send
(CTS)
Pin 6
Data Set
Ready (DSR)
(not used)
Pin 1
Data Carrier
Detect (DCD)
(not used)