Instruction Manual PEL-4 Precision LED Sector Light Vega Industries Ltd Aug 2018
PEL-4 Precision LED Sector Light Page 30 of 69 Manual Version V1.06
9.4 Serial Remote Control Mode Changes
The serial remote control interface is very versatile because the actual remote control
mode can be modified in real time through the serial interface.
The remote control mode commands described in sections 9.2.1 and 9.2.2 are all available
with the ‘<RCM>’ remote control mode serial command. This command uses the same
parameters as does the ‘7-4-’XYZ’ command. The <RCM> command operates
immediately without requiring a PEL-4 restart. The <RCM> command is shown in
Appendices A.1, A.3 and A.4 alongside the equivalent TVIR commands.
The capability to reprogram a PEL-4’s mode allows greater control of the PEL-4. For
example, the <RCM> command allows a single PEL-4 to be remotely configured into any
of the PEL-4 remote control applications described in section 9.2.3. In fact, the same PEL-
4 can have its remote control mode changed repeatedly without ever being physically
accessed. In addition, all PEL-4 parameters such as day and night intensity, flash
characters, etc can also be modified via the serial interface.
9.5 Simultaneous Use of Remote Control Hardwired Inputs and Serial Interface
Both the serial remote control interface and the hardwired remote control inputs, operate in
a differential mode. That is, a new control state is detected and implemented only when a
change occurs. The hardwired and serial control interfaces are designed to work together
to support remote serial control of a PEL-4 with a local hardwired manual override. The
following flow diagram gives an overview of the interaction of the two control systems.
An example of how the serial and hardwire controls interact is as follows:
After commissioning, a PEL-4 is remotely turned on and off every 24 hours using
the serial interface command <RON>.
If a fault occurs with the serial communications system, a site-visit can be made to
manually set the PEL-4 into the correct state. A manual override can be activated
on-site by toggling the On/Off hardwired input to the desired state (see next step).
The hardwired input recognises a change in its own state, so if its state does not
match the current PEL-4 state, it will need to be toggled. This ‘toggling’ approach
will always work with the hardwired inputs. (e.g. if the PEL-4 was off and the
hardwire On/Off input switch was found to be in the on position then toggling the
switch on->off->on will always turn on the PEL-4).
If necessary, repeated site visits to manually change the PEL-4 state can be made
until the serial communications system is repaired.
Until new serial <RON> commands are received by the PEL-4, it will remain in the
state manually set by the On/Off input switch.
Once the serial communication system is operational again, sending a new <RON>
command(s) will override whatever state the hardwire On/Off switch was manually
set to – normal service is resumed.
The same behaviour occurs with the Day/Night (<RDN>) input (command).
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