User's Manual

Diagnostic Testing and Troubleshooting
Using the RS-232 Interface
6
6-11
Diagnostic Display Test
For a constant front panel display with all segments lit, turn off the device, then turn the
power on again while holding down the front panel  key. After the device 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 6-5), turn off the
instrument, then turn the power on again while holding down the front panel COMM key.
After the device beeps, and the message "rESEt" is displayed for one second, release the
key.
Table 6-5. Device Default COMM Parameters
Parameter Default Setting
Base Channel Number 1
Line Frequency 60 Hz
Network Selection Isolated Network
Socket Port 4369
Internet Protocol Address 198.178.246.001
Baud Rate 9600
Using the RS-232 Interface
The device 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 device 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 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 user can set master alarm output, trigger out, DIO output, and relay
outputs. The user can view the trigger input, relay settings, and DIO input. The user has
access to the totalizer value and configuration.
The RS-232 interface does not perform acquisition scans and does not save measured
data in the scan queue or last scan record. The computed channels are not accessible.
Alarms are not configurable through the RS-232 interface. When calibration is enabled,
the secondary display shows “CAL.” The device does not output measurements to an
RS-232 printer as Hydra did. The REM annunciator will not be lit.
Command Processing
The device RS-232 interface processes input and output in a manner similar to NetDAQ.
The device receives a command or query from the host. The device returns a response to
a valid query. The device always returns a prompt after processing an input line (the
prompt follows the response in the case of a query).