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Set hardware options
To change the operating mode of the 7400A from DCE to DTE (or vice versa), you
change the position of a small circuit board (the Electronic Industries Association
connector board) inside the case. See
!
WARNING:
Electrostatic discharge can severely damage sensitive electronic circuits.
Before handling any electronic hardware, be sure to wear a grounding wrist
strap or other static-dissipating device. Do not touch exposed circuitry or
semiconductor chips.
1. Unplug the data module from the power receptacle.
2. Remove the access panel on the top of the case by grasping the rear lip of
the panel and pulling sharply upward.
3. While facing the front of the data module, locate the small EIA connector
circuit board. It sticks up vertically, and a large, silver arrow on the main
circuit board points to it.
1. 7400A data module
Figure 11. Data module mode selector
4. Note the three letters engraved in the upper lefthand corner of the EIA
connector board. Data modules ship from the factory with board inserted
with "DCE" in the upper left corner.
555-233-116
7400A Data Module
POWER TEST
Figure 11
and proceed as follows.
DTE
NEXT/NO
DATA
2. EIA connector board (shown in DTE mode)
Issue 4 October 2002
HOME
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ENTER/YES
7400atop KLC 053096
51
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