RS-232 interface DB25 pin definition :
PIN |
Signal Name |
Description |
DTE Direction |
DCE Direction |
2 |
TxD
|
Send Data |
Output
|
Input
|
3 |
RxD
|
Receive Data |
Input
|
Output
|
7 |
GND
|
Signal Ground |
|
|
17 |
RxC
|
Receive Clock |
Input
|
Output
|
24 |
TxC
|
Send Clock |
Output
|
Input
|
RS-4222 interface DB25 pin definition :
PIN
|
Signal Name
|
Description
|
DTE Direction
|
DCE Direction
|
2
|
TxD+
|
Send Data Positive
|
Output
|
Input
|
14
|
TxD-
|
Send Data Negative
|
Output
|
Input
|
3
|
RxD+
|
Receive Data Positive
|
Input
|
Output
|
16
|
RxD-
|
Receive Data Negative
|
Input
|
Output
|
7
|
GND
|
Signal Ground
|
|
|
17
|
RxC+
|
Receive Clock Positive
|
Input
|
Output
|
9
|
RxC-
|
Receive Clock Negative
|
Input
|
Output
|
24
|
TxC+
|
Send Clock Positive
|
Output
|
Input
|
11
|
TxC-
|
SendClock Negative
|
Output
|
Input
|