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5-3 RECEIVER RESPONSE COMMANDS:
Some commands interrogate the receiver, requiring it to return data to the controller.
These responses are generally similar to the command format. For example, if a receiver
is asked to report its current operating frequency (TF), the response might be:
'F10.12345'. In addition, whenever a receiver sends information, a status code is
appended to the end of each response. The status code is the letter S followed by a
number such as, 'S1' which indicates that the receiver is operating in remote mode. The
status number is encoded as follows:
1
Receiver is in remote control mode.
2
Synthesizer is out of lock.
4
Not used.
8
Last string had character transmission error.
16
Last string had data error.
32
Last string had lost data.
64
External reference applied.
128 Receiver in mute (activated by command).
If the receiver and interface are operating properly, the receiver would report a status
code of 'S1' (or 'S64' if using an external reference). Each receiver response is
terminated with a carriage return ASCII 13 (hex 0D).
Important Note: Interrogation commands may be directed to only one receiver at a time.
Response commands addressed to multiple receivers are ignored.
5-4 RECEIVER CONTROL COMANDS:
Control commands affect receiver operating status (setting of frequency, mode,
bandwidth, etc.). All commands in this group require additional data following the
command code. If a command code is sent to a receiver without properly-formatted
supplemental data, the receiver will ignore the command code and deselect itself. It will
then ignore any incoming characters until it receives a carriage return (ASCII 13).
The section below describes individual commands plus the type and range of data that
should follow to properly complete the command. For example, 'Fnn.nnnnnn' represents
the Set Frequency command 'F', which should be followed by up to two digits, a decimal
point, and then six digits. In most commands a decimal point will be required (any
exceptions will be noted below).
5-3
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