PM381 User Manual
Rev.1.4
www.prttech.com
15
3 INTERFACE
3.1 Interface Connector
Pin No.
Signal Name
Function
1
RXD
Receive data
2
TXD
Transmit data
3
SG
Signal ground
4
DSR
Data set ready
5
DTR/RTS
Data terminal ready/
Data request to send
6
FG
Frame ground
3.2 USB Connector
Pin No.
Signal Name
Function
1
V Bus
+24 V
2
Data -
Data -
3
Data +
Data +
4
GND
GND
3.3 Power Connector
Pin No.
Signal Name
Function
1
+24V DC
+24V DC
2
+24V DC
+24V DC
3
GND
GND
4
GND
GND
