Receiver Control - Ten-Tec RX-340 Technical Manual

5-2 RECEIVER CONTROL:

Control of the RX- 340 is achieved through plain text (ASCII) command codes sent from
a remote PC or other control unit. Command codes provide control of frequency, mode,
and other operating parameters--plus control of BITE self-diagnostics and Scan/Memory
functions. All command codes consist of a single ASCII letter. The comma ',' and
dollar sign '$' are also used in addressing operations. In addition to a command code
letter, additional information may be required immediately following the letter (See
specific codes). All command strings must be terminated by a carriage return ASCII 13
(hex 0D). Only capital letters are allowed in command strings.
The desired receiver (or group of receivers) must be selected or addressed before
commands can be issued. The Select light on the front panel will illuminate when radio
has been addressed. Dipswitch S2 (on the rear panel of each receiver) allows a receiver's
address to be set from 0 to 127 (See figure 5-2). To select a receiver, send '$' followed
by the assigned address number. For example, to address receiver 15, send '$15'. To
address more than one receiver, list each one separating each address by a comma. For
example, to address receivers 9, 15, and 22, send '$9,l5,22'. Receivers remain addressed
until another addressing command is issued.
Once a receiver (or group) is addressed, additional receiver commands may be sent to
control frequency, mode, operating parameters, etc. Some receiver commands are single
characters —such as 'X'-which tells a receiver to report the current incoming signal
level. Other commands require added information to complete the command, such as 'F
10.12345' to set frequency or 'D3' to set the detection mode to CW.
It is important to follow proper syntax when issuing commands. Receivers not included
in the command address ignore commands intended for designated receivers. In addition,
if a selected receiver detects an error in the incoming command string, it will ignore the
command and de-select itself as a safeguard against data errors.
Multiple addresses and multiple operating commands may be placed in the same
command-string as long as the total command string length does not exceed 256
characters, including the terminating carriage return.
For example, '$0,2F10.1D1M4A100' <CR> would command receivers 0 and 2 to tune
10.1 MHz, AM detection mode, programmable AGC, with attenuation set for 100 dB.
5-2