3-4 Installation Date Code 20010518
SEL-2020 Instruction Manual
Table 3.1: Serial Port Connector Pin Definitions
Pin Ports 1-16 Port F
1 +5 Vdc* N/C
2 RXD RXD
3 TXD TXD
4 +IRIG-B N/C
5,9 GND GND
6 GND (-IRIG-B) N/C
7 RTS RTS
8 CTS CTS
*When internal jumper is installed.
Communication Cables
Standard SEL communication cables available for your use with the SEL-2020 are listed in Table
3.2. Using an improper cable can cause numerous problems, so you must be sure to specify the
proper cable for the application. Please call the SEL factory if you have any questions about
cables and cable connections.
Never use standard null-modem cables with the SEL-2020. Using any non-SEL cable can cause
severe power and ground problems involving pins 1, 4, and 6 on the SEL-2020 communication
ports.
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