33
Serial Input Port Pinouts
RS-232
PIN
SIGNAL NAME
DESCRIPTION
INPUT/OUTPUT
1
DCD
Carrier Detect
Output
2
RD
Receive Data
Output
3
TD
Transmit Data
Input
4
DTR
Data Terminal Ready
Input
5
GND
Signal Ground
N/A
6
DSR
Data Set Ready
Output
7
RTS
Request to Send
Input
8
CTS
Clear to Send
Output
9
RI
Ring indicator
Output
RS-422
PIN
SIGNAL NAME
DESCRIPTION
INPUT/OUTPUT
1
(DCD)
(Carrier Detect)
Output
2
RXDL
Receive Data Low
Output
3
TXDL
Transmit Data Low
Input
4
TXDH
Transmit Data High
Input
5
GND
Signal Ground
N/A
6
RXDH
Receive Data High
Output
7
HSKOA
Handshake Output
Input
8
HSKIA
Handshake Input
Output
9
(RI)
(Ring Indicator)
Output
DB9 Female Connector
4
7
2
3
9
8
6
1
5