2.8
CPU Board and DIP Switches
This test displays the current settings of the eight DIP switches on the CPU board. This screen updates
simultaneously as the switches are changed. This diagnostic is useful for determining the status of the switches
from a remote location.
The following paragraphs discuss the currently used switches:
Switch 1—Fixes serial port baud rates to known values
Baud In
Baud Out
Data Bits
Stop Bits
Parity
Flow Ctrl..
Port 1
9600
9600
8
1
None
None
Port 2
300
300
7
2
None
None
Switches 2 through 6 —Comdial Engineers reserve these switches for future design needs.
Switch 7—Initializes DXP Modem—sets auto answer, for example. Switch 7 should always be on to ensure that
the system will re-initialize the modem after a loss of power or reset. The standard Hayes*-compatible initialize
string that the system sends is:
AT SO=1 M0 Q1 E0
. Programmers can alter this string if needed through system
programming.
*Hayes is a registered trademark of Hayes Microcomputer Products.
Switch 8—Used for software upgrades. At initial power-up after a software up-grade, this switch causes the
system to automatically detect the up-graded software and perform a master clear function. If someone up-grades
the software to a different revision and this switch is not
ON
at the power-up, the system will not run.
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IMI89–239
Understanding The System Diagnostics