Juniper Systems Allegro MX User Guide - Manual (Page 80)

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Field PC Owner’s Manual
-pin Serial Port Pinouts
Pin # Description
1 Data Carrier Detect (DCD) Input
2 Receive Data (RCD) Input
3 Transmit Data (TXD) Output
4 Data Terminal Ready (DTR) Output
5 Ground (GND)
6 Data Set Ready (DSR) Input
7 Request To Send (RTS) Output
8 Clear To Send (CTS) Input
9 Ring Indicator (RI) Input
Wiring Diagram