Enabling Additional Serial Ports; Figure 2-4 Rs-232 And Rs-422 Serial Connectors - Silicon Graphics POWER CHALLENGE User Manual

Chapter 2: Touring the Chassis
18
RS−232 Connector
Pin 9 Data Terminal Ready (DTR)
Pin 8 Data Carrier Detect (DCD)
Pin 7 Signal Ground (GND)
Pin 6 Grounded
RS−422 Connector
Pin 9 Request to Send (RTS)
Pin 8 Receive Data High (RXDH)
Pin 7 Transmit Data High (TXDH)
Pin 6 Signal Ground (GND)
Figure 2-4 RS-232 and RS-422 Serial Connectors

Enabling Additional Serial Ports

Use the steps in the following example (if necessary) to enable the additional
serial ports provided when you order an optional IO4.
1. Edit the file /var/sysgen/system/irix.sm.
2. Find a line that looks similar to the following:
Pin 5 Clear to Send (CTS)
Pin 4 Request to Send (RTS)
Pin 3 Receive Data (RD)
Pin 2 Transmit Data (TD)
Pin 1 NOT USED
Pin 5 Clear to Send (CTS)
Pin 4 Data Carrier Detect (DCD)
Pin 3 Receive Data Low (RXDL)
Pin 2 Transmit Data Low (TXDL)
Pin 1 Data Terminal Ready (DTR)