Silicon Graphics CHALLENGE L, User Manual, Page: 34 / 164

18
Chapter 2: Touring the Chassis
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 6 Signal Ground (GND)
Pin 1 Data Terminal Ready (DTR)
Pin 1 NOT USED
Pin 2 Transmit Data (TD)
Pin 3 Receive Data (RD)
Pin 4 Request to Send (RTS)
Pin 5 Clear to Send (CTS)
Pin 6 Grounded
Pin 7 Signal Ground (GND)
Pin 8 Data Carrier Detect (DCD)
Pin 9 Data Terminal Ready (DTR)
RS−232 Connector
Pin 2 Transmit Data Low (TXDL)
Pin 3 Receive Data Low (RXDL)
Pin 4 Data Carrier Detect (DCD)
Pin 5 Clear to Send (CTS)
Pin 7 Transmit Data High (TXDH)
Pin 8 Receive Data High (RXDH)
Pin 9 Request to Send (RTS)
RS−422 Connector