Quasonix TIMTER Installation And Operation Manual page 88

XDC 0 means set the current channel TTL control output to 0 unless XDP (polarity invert) is set, in which case it is
set to 1.
XDC 1 means set the current channel TTL control output to 1 unless XDP (polarity invert) is set, in which case it is
set to 0.
XDC A means set the current channel TTL control output based on the current frequency such that
if FR >= XDF then output is 1 if XDP is 0 (no invert)
if FR < XDF then output is 0 if XDP is 0 (no invert)
Examples:
XDC ? Help
XDC Show the current external device control state
XDC 1 Set the current channel TTL control output to 0 (assume polarity invert is set to 0)
XDC 0 Set the current channel TTL control output to 1 (assume polarity invert is set to 0)
4.2.3.1.21 External Device Frequency Switching Threshold Command – XDF
The XDF command sets the frequency threshold at which the TTL control output changes states. This command has
no effect unless XDC is set to Auto.
XDF accepts and displays up to six decimal places, meaning the frequency (in MHz) can have precision down to 1
Hz. The trip point may be set to any frequency the transmitter supports. The valid range is 200.0 MHz to 5260.0
MHz.
Syntax: XDF [?/freq]
where freq is the frequency at which the TTL control output changes states if XDC is set to auto.
Which state it changes to depends on the setting of XDP:
Examples:
XDF ? Help
XDF Show the current external device frequency switching threshold
XDF 4430.0 Set the current external device frequency switching threshold to 4430.0 MHz
4.2.3.1.22 External Device Polarity Invert Command – XDP
The XDP command sets the polarity of the TTL control output. In the definition, 0 means do NOT invert the
polarity of the output, 1 means invert the polarity of the output.
It looks at the frequency and compares it to XDF to see whether XDC is set to auto, or just an XDC parameter,
which will otherwise be 0 or 1. The output is determined from those.
80 Quasonix, Inc.
or 0 if XDP is 1 (invert)
or 1 if XDP is 1 (invert)
if FR >= XDF then output is 1 if XDP is 0 (no invert)
if FR < XDF then output is 0 if XDP is 0 (no invert)
TIMTER™ Multi-mode Dual
or 0 if XDP is 1 (invert)
or 1 if XDP is 1 (invert)
Telemetry Transmitter