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Chapter 7
Troubleshooting
How You Interpret Status
Indicators
7 2
Feature
End of string delimiter
BCD delimiter
There are three LED status indicators on the front of the module. They
are labeled:
FAULT
BUFFER FULL
CHANNEL ACTIVE
The location of these LED indicators and how you interpret them is
described in Figure 6.1.
Figure 6.1
Status Indicators
FAULT This red indicator illuminates when the module
ASCII
detects an internal hardware fault. It is normally off.
I/O
BUFFER FULL This yellow indicator illuminates when the input buffer is
full. It must be reset by program logic using CW1(03).
CHANNEL ACTIVE This green indicator illuminates when an ASCII
FAULT
device is turned on and is properly connected to the INTERFACE port.
The module examines only the received data line for channel active
indication. This indicator does not monitor communication between the
processor and the ASCII module.
BUFFER
FULL
NOTE: In RS 232 C and current loop modules, disregard the CHANNEL
ACTIVE indicator when in simplex mode of transmission. The simplex
CHANNEL
write mode disregards the status of the receive line, which is indicated by
ACTIVE
the CHANNEL ACTIVE indicator.
Word (Bit)
Invalid Setting or Range
IW3(10 16)
Same value as IW4(10 16)
when you use IW3 and
IW4
3A hex, when you do not
use IW4 (3A is default of
IW4(10 16) when IW4 is
not used)
IW4(10 16)
No value entered when
using all four initialization
words (00 hex is an illegal
BCD delimiter value)
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