- RAD Data Communications TDMoIP Gateway Installation and Operation Manual

IPmux-16 Installation and Operation Manual Chapter 2 Installation
Equipment Needed 2-3
Table 2-1. Null Cable Pinout Connections
DB-9 Female
Pin No.
Signal Name
1 DCD Data Carrier Detect
2 RXD Receive data
3 TXD Transmit data
4 DTR Data Terminal Ready
5 GND Ground
6 DSR Data Set Ready
7 RTS Request To Send
8 CTS Clear To Send
9 RI Ring Indicator
On both DB9 connectors, DCD (pin 1), DTR (pin 4) and DSR (6) are connected
together.
RTS (pin 7) is shorted together with CTS (pin 8). Refer to Figure 2-1.
CBL-DB-9/DB9/NULL
DB-9 (Female)
DB-9 (Female)
1
2
3
4
5
7
8
6
99
8
7
6
5
4
3
2
1
Figure 2-1. Null Cable (CBL-DB-9/DB-9/NULL) Pin Shorts