Console Serial Port - DEC 4000 AXP Service Manual

6.5.1 Console Serial Port

The baud rate for the console serial is set at the factory to 9600 bits per second.
Most Digital terminals are also shipped with a baud rate of 9600.
You can select a baud rate for the console serial port using the volatile
environment variable, tta0_baud. Allowable values are 600, 1200, 2400, 4800,
9600, and 19200. Use the
environment variable. At power-up, the console serial port baud rate is read from
the baud rate select switch.
You can manually select a baud rate for the console serial port using the baud
rate select switch located behind the OCP (Figure 6–16). The switch also allows
you to power up without initiating drivers (switch position 0, robust mode). Refer
to Section 2.2.3 for information on using robust mode to solve problems getting to
the console program. Table 6–4 provides the baud rates as they correspond to the
rotary switch setting.
The baud rate select switch should be changed only when power is off, as
it is read by the system during power-on self-tests.
6–42 System Configuration and Setup
set command to assign values to the tta0_baud
Note