RS-232C Interface Specification
The RS-232C Interface DCE mode (default) specification is given in the
table below:
Pin
Name
Function
1
CD
PULL Up (+9v)
2
TxD
Transmit Data
3
RxD
Receive Data
4
DSR
Data Set Ready
5
GND
Ground
6
DTR
Data Terminal Ready
7
CTS
Clear to Send
8
RTS
Request to Send
9
RI
Ring indicator
Centronics Interface Timing Chart
- 8 -
DATA
STB
BUSY
ACK
1
0
0.25
0.5 US
(min)
1 US
(min)
1 US
(min)
0.5 US
(min)
0.5 US
(min)
0.5 US
0.25 US(min)
1 US
(min)
0.5 US
(min)
1
0
1
0
1
0
1 US
(min)
2001 - 01 -10
