Operating instructions

1892 1335 - Orion Radio Modem Operating Instructions - v2.9 / Aug 2009 69
Over-Air
Command Parameters
Description Set Syntax Read
Syntax
Parameter Description Value or Range Meaning of Values Default
Value
The following parameters are fixed properties of, or values appropriate to, the radio, which the system needs to know.
Top of switching bandwidth ATFHB=xxxx.xxxxxxx ATFHB? xxxx.xxxxxxx Highest frequency Depends on radio Frequency in MHz
Bottom of switching
bandwidth
ATFLB=xxxx.xxxxxxx ATFLB? xxxx.xxxxxxx Lowest frequency Depends on radio Frequency in MHz
Comparison Frequency ATFC=c ATFC? c Code for frequency 0 FC = 6.25 kHz
1 FC = 10.0 kHz
2 FC = 12.5 kHz
3 FC = 20 kHz
4 FC = 25 kHz
IF Frequency ATFIF=xxxx.xxxxxxx ATFIF? xxxx.xxxxxxx IF frequency Depends on radio Frequency in MHz
TX delay ATPT=n ATPT? n Delay appropriate to radio 2 to 29 Delay in ms
Number of preambles ATS165=n ATS165? n Number of preambles 2 to 9 Number of preambles
Inverted symbol state ATS167=n ATS167? n Code for inversion 0 None invert
type 1 TX invert
2 RX invert
3 Both invert
Squelch delay ATS168=n ATS168? n Delay appropriate to radio 2 to 9 ms
The following parameters set the values contained in a table of possible transmit frequencies, and any offset to be applied to the reception frequency. These must lie
within the radio’s capabilities defined above.
Centre frequency = Channel
0
ATS155=nnn.nnnnn ATS155? nnn.nnnnn Centre frequency Depends on radio MHz
Channel step size ATS161=n ATS161? n Code for channel step 0 6.25kHz
1 10kHz
2 12.5kHz 2
3 20kHz
4 25kHz
TX to RX frequency offset ATRXOFF=sxxx.xxxxxx ATRXOFF? s Sign (direction of + [ascii plus] Rx freq is higher than Tx +
offset). May be omitted for
plus.
- [ascii minus] Rx freq is lower than Tx
xxx.xxxxxx Offset Depends on radio Offset in MHz 0
The following two parameters determine the operating frequency in use at any time. If a channel is selected, then Operating Frequency takes on the contained Tx value.
If Operating Frequency is set directly, then it must be to a value contained in the table, and Channel Number takes on the corresponding channel number.
Channel number ATS157=snn ATS157? s Sign (direction of + [ascii plus] Positive channel offset +
-99 to +99 offset) - [ascii minus] Negative channel offset
nn Channel offset 0 to 99 Offset From Channel 0 0