Appendix J: Db9 Pinouts; Terminal Port; Modem Port - US Robotics USR3520 User Manual

Appendix J: DB9 Pinouts

The USR3520/USR803520 has two DB9 serial ports.

Terminal Port

The USR3520/803520 Terminal port is an RS-232 DCE presented on a DB9 female connector using a
standard pinout.
RS-232 output signal levels are nominally ±5v.
DB9F Pin Symbol
1 DCD
2 TXD
3 RXD
4 DTR
5 GND
6 DSR
7 CTS
8 RTS
9 RI

Modem Port

The USR3520/803520 Modem port is an RS-232 DTE presented on a DB9 male connector using a standard
pinout.
RS-232 output signal levels are nominally ±5v.
DB9M Pin Symbol
1 DCD
2 RXD
3 TXD
4 DTR
5 GND
6 DSR
7 RTS
8 CTS
9 RI
Modemulator User Guide
Description
Carrier Detect
Transmit Data
Receive Data
Data Terminal Ready
Ground
Data Set Ready
Clear To Send
Request To Send
Ring Indicator
Description
Carrier Detect
Receive Data
Transmit Data
Data Terminal Ready
Ground
Data Set Ready
Request To Send
Clear To Send
Ring Indicator
Direction
Output
Output
Input
Input
-
Output
Input
Output
Output
Direction
Input
Input
Output
Output
-
Input
Output
Input
Input
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