NHRC- Programming and Operations Guide
Status indicator LEDs show state of all channels, valid DTMF digit decode and the PTT line status. The status LEDs
can be disabled for lower power consumption. The NHRC draws about 14mA @13.8V with the LED’s
disabled making it ideal for solar powered applications.
3 Commands
There are 16 individual port on/off commands. Each turns one of the eight outputs on or off.
There are 4 programming commands: set configuration, load timers/data, program the Morse code ID message, and
re-program commands.
All of the commands can be re-programmed by the user for increased security. See section 3.2.4 for instructions on
re-programming the command codes.
In order to get you started easily, all commands have a “default” value set at the factory. The default values can be
restored by using the “initialization” process, described in section 3.3.
Each command has a default value, and an “index”, which is used to reference the particular command when you
want to re-program it. Ignore the “index” value for now, it will be discussed later in the Programming Commands
section.
3.1 Output Control
Output Control Commands
Index Default
Usage
01
11
output 1 on
02
10
output 1 off
03
21
output 2 on
04
20
output 2 off
05
31
output 3 on
06
30
output 3 off
07
41
output 4 on
08
40
output 4 off
09
51
output 5 on
10
50
output 5 off
11
61
output 6 on
12
60
output 6 off
13
71
output 7 on
14
70
output 7 off
15
81
output 8 on
16
80
output 8 off
Assuming the default command values have not been changed, you can command port 1 on by sending “11”, and
command port 1 off by sending “10”. You can command port 7 on by sending “71”. As noted above, all of these
commands can be re-programmed into ANY DTMF sequence, containing 1 to 8 of the DTMF codes 0-9, A-D, * and
#.
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