Communications - Teledyne 300E Instruction Manual

Model 300E Carbon Monoxide Analyzer
Instruction Manual
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2. If the analyzer stops part way through initialization (there are words on the
vacuum fluorescent display) then it is likely that the DOC has been
corrupted.
11.5.9. RS-232 Communications
11.5.9.1. General RS-232 Troubleshooting
T-API analyzers use the RS-232 communications protocol to allow the instrument to
be connected to a variety of computer-based equipment. RS-232 has been used for
many years and as equipment has become more advanced, connections between
various types of hardware have become increasingly difficult. Generally, every
manufacturer observes the signal and timing requirements of the protocol very
carefully.
Problems with RS-232 connections usually center around 4 general areas:
Incorrect cabling and connectors. See Table 7–12 for connector and pin-out
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information.
The BAUD rate and protocol are incorrectly configured. See Section 7.7.6.
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If a modem is being used, additional configuration and wiring rules must be
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observed. See Section 7.7.10
Incorrect setting of the DTE – DCE Switch is set correctly See Section 7.7.2
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Verify that cable (03596) that connects the serial COM ports of the CPU to
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J12 of the Motherboard is properly seated
P/N 04288 REV: A
There is no activity from the primary RS-232 port (COM-A) on the rear
panel even if "? <ret>" is pressed.
In some rare circumstances this failure may be caused by a bad IC on
the Motherboard, specifically U57 the large, 44 pin device on the lower
right hand side of the board. If this is true, removing U57 from its
socket will allow the instrument to startup but the measurements will
be incorrect.
TROUBLESHOOTING & REPAIR PROCEDURES
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