RS-232C (COM1)
D-Sub 9 pin plug connector
Product side:
|
Pin No. |
RS-232C |
||
|---|---|---|---|
|
Signal name |
Direction |
Description |
|
|
1 |
CD |
Input |
Carrier detect |
|
2 |
RD (RXD) |
Input |
Receive data |
|
3 |
SD (TXD) |
Output |
Send data |
|
4 |
ER (DTR) |
Output |
Data terminal ready |
|
5 |
SG |
- |
Signal ground (not isolated) |
|
6 |
DR (DSR) |
Input |
Data set ready |
|
7 |
RS (RTS) |
Output |
Request to send |
|
8 |
CS (CTS) |
Input |
Send possible |
|
9 |
CI (RI) |
Input |
Called status display |
|
Shell |
FG |
- |
Frame ground (common with SG) |
Recommended jack screw is #4-40 (UNC).