Watkins-Johnson Company WJ-8711A, Installation, Operation And Maintenance Manual

Page: 138 / 261

CSMA REMOTE CONTROL WJ-8711A DIGITAL HF RECEIVER
5-14
5.8.11
RESPONSE TO MANUAL GAIN LEVEL REQUESTS [32]
Figure 5-15 shows an example of the typical response format when requesting the receiver's
manual gain level with control code [32].
FE
PREAMBLE
FE
RX
ADDR
TX
ADDR
CONTROL
CODE
END OF
MESSAGE
1A F1 32 98 00 FD
100'S 1'S
87IL20
Figure 5-15. Manual Gain Level Request Format
Two bytes in the response following the control code contain the current manual gain level.
The combination of the two bytes represent the value in binary coded decimal. The value can be from 0000 to
0127 (or 0 to 127 dB). In the example, the manual gain level response is 98 [98|00].
5.8.12
BFO FREQUENCY COMMAND WITH ACKNOWLEDGE [35]
Figure 5-16
shows an example of the typical format for sending the receiver's BFO frequency
using control code [35]. This control code requires an acknowledgment to the controller.
FE
PREAMBLE
FE
RX
ADDR
TX
ADDR
CONTROL
CODE
END OF
MESSAGE
1A F1 35 50 25 0A
100 kHz 1 Hz
FD
SIGN*
* Where: 0000 1010 binary = +
0000 1110 binary = -
87IL21
Figure 5-16. BFO Frequency Command Format
Courtesy of http://BlackRadios.terryo.org