Serial Interface Specifications
76 Apollo SL30 Installation Manual
ADC DATA OUTPUT
This message outputs the current value of one of the ADC (Analog to Digital Converter)
channels read by the NAV Microcontroller.
This message is only available in normal mode.
Message format:
“V”.................Message class. This is a VHF NAV message.
“32”................Message identifier.
c......................ADC channel: “0” to ”8”
0 = Input voltage level, in units of 125 mV.
1 = 3.3V reference, in units of 15 mV, value ranges from 0 to 255.
2 = 5V reference, in units of 25 mV, value ranges from 0 to 255.
3 = 12V reference, in units of 50 mV, value ranges from 0 to 255.
4 = 28V reference, in units of 125 mV, value ranges from 0 to 255.
5 = Volume potentiometer, value ranges from 0 to 255.
6 = Photocell, value ranges from 0 to 255.
7 = Display thermistor, value ranges from 0 to 255.
8 = Crystal thermistor, value ranges from 0 to 255.
vv ...................Value. A two digit encoded hex number representing the latest value read
from the specified ADC channel.
Example message:
$PMRRV32637<chksm><CR><LF>
The latest value read from the Photocell (channel 6) is 0x37.
COMM TRANSCEIVER STATUS
This message outputs the result of a specific system test.
Message format:
“V”.................Message class. This is a VHF NAV message.
“35”................Message identifier.
mk ..................Active frequency: m = MHz, where m = desired MHz frequency - 30h,
ranging from 118 to 136 MHz, 162 (i.e., 76h to 88h, A2h); k = (kHz
offset / 25 kHz) + 30h, ranging from 000 to 975 kHz in 25 kHz steps.
mk ..................Standby frequency: m = MHz, where m = desired MHz frequency - 30h,
ranging from 118 to 136 MHz, 162 (i.e., 76h to 88h, A2h); k = (kHz
offset / 25 kHz) + 30h, ranging from 000 to 975 kHz in 25 kHz steps.
a......................Transceiver status:
R = Normal receive
M = Monitor receive
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