TROUBLESHOOTING
5 - 2
I-E96-217A
®
SERIAL PORT AND MODULE BUS CHECKOUT
Tests can be run to check the SPM serial ports and module bus
communication. The serial port checkout (i.e., echo test) can be
done to check either of the SPM serial ports. The module bus
checkout procedure checks the communication between the
SPM and modules on the module bus. Both tests require a
diagnostic terminal (i.e., dumb terminal).
These tests can be run as a troubleshooting procedure or after
SPM installation to verify module operation and connections.
An explanation of the procedures follows.
Serial Port Checkout Procedures
The echo test can be run to test each RS-232C serial port. In
the echo test mode, the SPM receives a character code (i.e.,
keyboard character) typed at a diagnostic terminal and returns
that code to the terminal for display. The terminal monitor will
immediately display the letter that was typed if the SPM serial
port the diagnostic terminal is connected to operates properly.
The echo test checks the SPM receive and send operations. It
also checks the connections between the SPM and the termi-
nal.
To run the test:
1. Set S4 dipswitch position 3 on the SPM to OPEN (OFF) to
initiate the echo test. Take note of the byte framing and parity
Table 5-1. Status LED Indications and Corrective Actions
LED State
Indication
Probable Cause
Corrective Action
Green
SPM powered up and operating
normally, ALL self tests passed.
Normal operation.
No action required.
Red
Machine fault timer error (
time
out).
Microprocessor or
related hardware
failure.
Press reset switch to attempt to
clear the error.
If this does not reset the error,
replace module or contact near-
est Bailey Controls representa-
tive.
Off
No power to SPM.
Module not completely
inserted in MMU.
Verify module is completely
inserted in MMU: faceplate flush
with MMU and captive retaining
screws latched.
+5 VDC logic power failure (on
SPM). LED or LED driver failure.
SPM circuit failure.
Replace module or contact near-
est Bailey Controls representa-
tive.
