M7 GX Technical Manual
36
Raveon Technologies Corp.
6.5.
Digital Inputs (Trigger Bits)
The stock
RV-M7 GX
Transponder has 3 digital inputs. The status of these input
bits is transmitted every time the M7 reports its position.
When configuring an M7 GX, you may configure any or all of the digital inputs to be
“
Trigger Bits
”. The status of all bits is transmitted every time, but when a bit is
designated as a
Trigger Bit
, it will also cause the M7 to wake-up if it is sleeping,
and triggers it to send a transmission as soon as it can. They are called Trigger
Bits because the bits can be used to trigger the M7 to transmit at the faster
TXRATE instead of the slower IDLERATE.
The M7 GX has low-power modes and an idle transmission rate (IDLERATE). The
M7 GX may be configured to use bits designated as
Trigger Bits
to come out of
low-power mode or transmit at a faster rate. But, regardless of the rate or Trigger
Bit designation, the status of the digital input bits will be transmitted along with
each position report. Beginning with firmware version C2 (March 2010), if a bit is
designated as a Trigger Bit, its state will be latched when it triggers, and the
latched state is transmitted. Older version of firmware do not latch the state, and
thus the My reports the state of the bit at the moment the position is transmitted.
C2 and higher report the latched state of the trigger bit.
Bits that are designated
Trigger Bits
are digital inputs that trigger the
RV-M7 GX
to
trigger a report of the M7’s position and status. Normally these inputs are used for
RS-232 signals, but they may be used for general-purpose digital inputs. The
RV-
M7 GX
may be configured to trigger a position/status report based upon the digital
input bits state.
Important: If the digital input function is not needed, the
TRIGBITS
setting must be
set to
0
. This is the factory-default setting, and unexpected transmission may
happen if the digital inputs are enabled and not used.
If you are not using digital inputs,
TRIGBITS
must be set to 0. (
TRIGBITS 0
command)
If the
RV-M7 GX
was configured to transmit less-often when it is not moving
(
IDLERATE
command), activation of the digital inputs will override this causing the
unit to report at the interval programmed with the
TXRATE
command.
The digital inputs may be configured to trigger active high, active low, or active on a
change in state. The following table lists the available digital inputs on the
standard RV-M7 GX:
RS-232 Pin
Function
4 - DTR
Input 0
7 - RTS
Input 1
3 - TXD
Input 2
5 - Ground
GND
There are 3 commands that must be configured to use the digital inputs:
