PBH-101 User Manual Ver. 1.2
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⚫
RS232 pin assignment
Pin Name
Description
Level
I/O
Note
1
DCD
Data Carrier Detect
RS232
-
N/A
2
RXD
Receive Data
RS232
In
basic
3
TXD
Transmit Data
RS232
Out
basic
4
DTR
Data Terminal Ready
(always output active signal)
RS232
Out
optional
5
GND
Ground
-
-
basic
6
DSR
Data Set Ready
RS232
-
N/A
7
RTS
Request To Send
RS232
Out
optional
8
CTS
Clear To Send
RS232
In
optional
9
RI
Ring Indicator
RS232
-
N/A
Table 1-4 RS232 pin assignment
⚫
RS422 pin assignment
Pin
Name
Description
Level
I/O
Note
9
TX +
Transmit Data +
RS422
Out
basic
1
TX -
Transmit Data -
RS422
Out
basic
4
RX +
Receive Data +
RS422
In
basic
3
RX -
Receive Data -
RS422
In
basic
5
GND
Ground
-
-
basic
Table 1-5 RS422 pin assignment
⚫
RS485 pin assignment
Pin
Name
Description
Level
I/O
Note
9
TRX +
Data +
RS485
In/Out
basic
1
TRX -
Data -
RS485
In/Out
basic
5
GND
Ground
-
-
basic
Table 1-6 RS485 pin assignment
Biasing Register (100K
Ω
) is connected to RS422/485 line.
