6.1.8 RF
Control
The following simple command messages that do not have an associated return of data allow control
of the RF by switching on or off the power supply to the active RF input components, if fitted (see
section 6.3.1 for details of message format).
Enable RF
Cancels the RF inhibit mode, described below.
Inhibit RF
Inhibits the RF output from the unit by removing the power to the active RF
input components.
6.1.9
Helix Current Monitoring
The following commend messages allow the control/monitoring of the built-in helix current monitoring
and recording feature.
Helix record top of file A simple command message that returns the helix current record pointer to
the top of the non-volatile historical helix current file (details below). The ‘top
of the file’ corresponds to the earliest record (see section 6.3.1 for details of
message format).
Next helix current
A command message requesting data, that results in a response showing the
record?
historical helix current record in mA. During operation in the transmit state,
the amplifier automatically stores in non-volatile memory, a reading of helix
current every 15 minutes. After 50 hours (200 readings) an average is taken
and stored to the non-volatile historical index current file. Each request
automatically steps the file pointer to the next entry, allowing easy data
retrieval. Resetting to the top of the file (earliest entry) is detailed in section
6.3.1 (see section 6.3.2 for details of command and response format).
Helix current?
A command message requesting data, that results in a response showing the
helix current in mA. If a request is sent in any state other than transmit, the
response will show helix current (see section 6.3.2 for details of command
and response format.
6.1.10 Elapsed
Hours?
A command message requesting data, that results in a longer data string response showing the total
elapsed hours and the elapsed hours in the transmit, standby and off states (see section 4.3 for
details of operating modes, see section 6.3.5 for details of message format).
6.1.11 Forward
Power?
A command message requesting data, that results in a response showing the RF output power in
watts. If a request is sent in any state other than transmit, the response will show zero forward power
(see section 6.3.2 for details of command and response format).
6.1.12 Interface
set-up
To use the serial communications interface, the amplifier must be placed into the remote mode of
operation. This can only be achieved via the serial communications interface. To send the remote
enable command, the address and baud rate must be correctly set. This can be done either:
In hardware, on the 41-pin control connector using links (see section 5)
or
Via the master controlling device by polling all combinations of address and baud rate. Once
captured either the address or baud rate can be modified.
The following command messages allow the set-up and control of the serial communications interface
feature:
Set address
Allows the address to be set in nominal units between 48 and 111
48 = 30H
111 = 6FH
(see section 6.4.5 for details of passing parameters).
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