11-2
IM CW120-E
Connector Pins and Assigned Signals
1
2
3
4
5
6
7
8
1. CTS (Clear To Send):
Input handshaking signal from the computer
used when transmitting data to the computer
2. RXD (Receive [rx] Data): Input data from the computer
3. RTS (Request To Send): Output handshaking signal to the computer
used when receiving data from the computer
4. TXD (Transmit [tx] Data): Output data to the computer
5-7.
Unused
8. GND (Signal Ground):
Signal ground
Directions of Individual Signals
The figure below shows the directions of the individual signals used in the RS-
232 interface.
2
3
8
7
RTS (Request To Send)
CTS (Clear To Send)
TXD (Transmit Data)
RXD (Receive Data)
Computer
CW120/121
Correspondences of Signal Abbreviations between RS-232 Standard,
CCITT Standard, and JIS (Japanese Industrial Standard)
5
3
2
7
8
Signal Ground
Transmit Data
Receive Data
Request To Send
Clear To Send
RS-232
AB (GND)
BA (TXD)
BB (RXD)
CA (RTS)
CB (CTS)
CCITT
102
103
104
105
106
JIS
SG
SD
RD
RS
CS
Abbreviations
Signal Names and Pin Assignment
Pin No.
(in 9 Pins)
Name
11.1 RS-232