Diagnostic Display Test; Comm Parameter Reset; Using The Rs-232 Interface - Fluke 2640A Service Manual

Diagnostic Display Test

For a constant front panel display with all segments lit, turn off the instrument, then turn
the power on again while holding down the front panel
beeps, release the key. The front panel display remains on until any front panel key is
pressed. This allows you to inspect the display segments.

COMM Parameter Reset

To reset all the communication parameters to the factory defaults (Table 5-5), turn off
the instrument, then turn the power on again while holding down the front panel COMM
key. After the instrument beeps, and the message "rESEt" is displayed for one second,
release the key.
Base Channel Number
Line Frequency
Network Selection
Socket Port
Internet Protocol Address
Baud Rate

Using the RS-232 Interface

The instrument supports calibration adjustment and verification using ASCII commands
on the RS-232 interface since Met/Cal does not have network capability, and field
calibration stations probably won't either. The instrument also supports several
commands for factory testing and several for software testing. The RS-232 interface is
also used to download the main software to flash.
The RS-232 interface does not perform acquisition scans and does not save measured
data in the scan queue or last scan record. The user can configure the function, range,
and number of terminals for channel one only. RS-232 can be used to get a measurement
on channel one. Other configuration elements cannot be set by the user through the RS-
232 interface. The computed channels are not accessible. Alarms are not configurable
through the RS-232 interface. The instrument does not set master alarm output, trigger
out, or DIO output in response to an RS-232 measurement query. The user has no access
to the totalizer value or the state of the DIO lines through the RS-232 interface. When
calibration is enabled, the secondary display shows "CAL." The instrument does not
output measurements to an RS-232 printer as Hydra did. The REM annunciator will not
be lit because the instrument does not provide commands like Databucket's REMS,
LOCS, RWLS.
Table 5-5. Instrument Default COMM Parameters
Parameter
Diagnostic Testing and Troubleshooting
key. After the instrument
Default Setting
1
60 Hz
Isolated Network
4369
---.---.---.--- (dashes)
38400

Using the RS-232 Interface

5-13.
5-14.
5-15.
5
5-9