34
Serial Output Port Pinouts
RS-232
PIN
SIGNAL NAME
DESCRIPTION
INPUT/OUTPUT
1
DCD
Carrier Detect
Input
2
RD
Receive Data
Input
3
TD
Transmit Data
Output
4
DTR
Data Terminal Ready
Output
5
GND
Signal Ground
N/A
6
DSR
Data Set Ready
Input
7
RTS
Request to Send
Output
8
CTS
Clear to Send
Input
9
RI
Ring Indicator
Input
RS-422
PIN
SIGNAL NAME
DESCRIPTION
INPUT/OUTPUT
1
(DCD)
(Carrier Detect)
Input
2
RXDL
Receive Data Low
Input
3
TXDL
Transmit Data Low
Output
4
TXDH
Transmit Data High
Output
5
GND
Signal Ground
N/A
6
RXDH
Receive Data High
Input
7
HSKOA
Handshake Output
Output
8
HSKIA
Handshake Input
Input
9
(RI)
(Ring Indicator)
Input
DB9 Male Connector
2
8
4
3
6
7
9
5
1