7
5) Repeat steps 2-4
Byte to Follow: 1 byte
1) Serial Port Echo Status
00h = Off
01h = On
Site Master Returns: 255 (FFh) Operation Complete Byte
224 (E0h) Parameter Error : Invalid serial port echo status
238 (EEh) Time-out Error
Single Sweep Mode On/Off - Control Byte #11 (0Bh)
Description: Enables or disables the Single Sweep Mode during Site Master modes of operation.
Single Sweep Mode activates once the Site Master exits from the remote mode.
When the Site Master returns to local mode, the Site Master stops sweeping and waits for either the
Run/Hold Key of the Site Master keypad or triggering byte #48 (30h).
Site Master also checks for the Enter Remote byte #69 (45h) at the end of each sweep. If present in the
buffer, Site Master Returns to remote mode.
Byte to Follow: 1 byte
1) Single Sweep Mode Status
00h = Off
01h = On
Site Master Returns: 255 (FFh) Operation Complete Byte
224 (E0h) Parameter Error : Invalid single sweep mode status
238 (EEh) Time-out Error
Watch-Dog Timer On/Off - Control Byte #12 (0Ch)
Description: Enables or disables the Watch-dog timer.
The Site Master incorporates a watch-dog timer for higher reliability in serial communication. In selected
control bytes (see control byte summary), the Site Master checks for the time interval between each byte
received from the computer. If the time interval exceeds the set time limit (0.5 sec), the Site Master
notifies the computer by sending Time-out Byte #238 (EEh). The Site Master discards the data it just
received and then waits for the next control byte sequence.
Byte to Follow: 1 byte
1) Watch-dog timer On/Off
00h = Off
01h = On
Site Master Returns: 255 (FFh) Operation Complete Byte
224 (E0h) Parameter Error : Invalid watch-dog timer status
Sequence Site Master Calibration - Control Byte #13 (0Dh)
Description: Initiates a calibration step.
The Site Master must be calibrated to give accurate measurements. Calibration is based on frequency
range. Once the frequency range is set, sequence the calibration process using this control byte. Measure
each component (open, short, load) then trigger the calculate step. The calculate step uses the
measurements obtained and generates the correction factors.
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