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INTRODUCTION
EVENT AND ERROR COUNTERS
MODULE STATUS BYTES
DIAGNOSTIC TERMINAL
I-E96-620A
SECTION 5 - TROUBLESHOOTING
There are several ways to troublehoot problems with the inter-
face while it is operating. They include using the Loop Interface
Module (INLIM03) error counters, accessing module status
bytes through the host computer, using the diagnostic port,
and doing a simple checkout procedure that tests the interface
without involving the host computer
The LIM provides error counters to assist in diagnosing prob-
lems. The LIM option switch (S1) sets the address of the error
counter that displays a count on the LIM faceplate LEDs. Refer
to Table
3-7
for a list of error counters. Information from an
error counter is similar to an event counter, except that it rep-
resents events caused by hard errors.
Five status bytes provide information about Plant Loop to Com-
puter Interface module status. Refer to the Enhanced CIU Pro-
grammer's Reference Manual for a list of module status bytes,
their meaning and how to access this information on the host
computer.
Use the diagnostic terminal to monitor interface to computer
communication. The diagnostic port works when the interface
is in normal operation (not in the echo mode). The interface
displays each command it receives and its reply on the diag-
nostic port in this format:
C hh hh hh OD
R hh hh hh OD
The C denotes the start of a command received from the com-
puter. The R denotes the start of the reply sent to the computer
for the previous command. The hh is the hexadecimal repre-
sentation of the bytes involved in the transmission. The diag-
nostic port displays the transmitted version of the reply or
command. That is, hexadecimal 1B 0E is transmitted for hex-
idecimal 0D and 1B 1B is transmitted for 1B. For computers
using the X-ON, X-OFF option, these bytes will be inserted in
INTRODUCTION
5 - 1
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