Sun Microsystems 280R manual About Changing Serial Port Settings, How to Configure Serial Settings

About Changing Serial Port Settings

The serial port jumper on the Sun Fire 280R permits the configuration of the system’s two serial ports for either EIA-423 or EIA-232D signal levels. EIA-423 levels are the default standard for North American users. EIA-232D levels are required for digital telecommunication in nations of the European Community.

How to Configure Serial Settings

Configuring jumpers can be performed from the ok prompt. Follow these steps:

Note –The default setting at serial ports A and B is RS-423 mode. To change the serial port to RS-232 mode proceed as follows.

1. To select RS-232 mode at serial ports A and B, at the ok prompt, type:

ok setenv ttya-mode 9600,8,n,1,-,rs232

ok setenv ttyb-mode 9600,8,n,1,-,rs232

To set the ports back to RS-423 mode, substitute rs423 for rs232 in the above commands.

2.To implement the new mode, at the ok prompt, type:

ok reset-all

Note –Setting only one of the ttya or ttyb rs232/rs423 mode variables causes both ports to be set to that mode.

For pin assignments, back panel icons, and connector diagram, see “Reference for the Serial Port A and B Connectors” on page 204.

Chapter 4 Hardware and Software Configuration 113