Acm Parameters - Comtech EF Data CDM-760 Installation And Operation Manual

Serial Interface Operation
CDM-760 Advanced High-Speed Trunking Modem
8.5.6

ACM Parameters

Controller-to-Target
Instruction Code and
Qualifier
Parameter Type
Command Query
ACM Operating ACM= ACM?
Parameters
ACM Degradation ADC= ADC?
Configuration
Remote N/A RES?
Signal to Noise
Ratio
Local N/A LES?
Signal to Noise
Ratio
Arguments for
Description of Arguments
Command or
(Note that all arguments are ASCII numeric codes from 48 to 57)
Query
7 bytes Command or Query.
Sets or returns ACM operating parameters in the form mmMMATT, where:
mm=Minimum ModCod, range is 1 to 28 (NET=0) or 1 to 47 (NET=1)
MM=Maximum ModCod, range is 1 to 28
A=Defines action on remote demod unlock (0=go to minimum Tx ModCod, 1=maintain Tx ModCod)
TT=Target EsNo Margin, from 0 to 45 that is ten times the EsNo in dB (from 0.0dB to 4.5dB).
EXAMPLE: <0/ACM=0121010 (sets min ModCod=1, max ModCod=21, Go to minimum Tx ModCod when remote
demod unlocks, sets Target Es/No at 1.0dB.)
10 bytes Command or Query.
Sets or returns ACM configuration parameters in the form qqeesstt, where:
qq=QPSK degradation in dB from 0.0 to 9.9
ee=8PSK degradation in dB from 0.0 to 9.9
ss=16-APSK degradation in dB from 0.0 to 9.9
tt=32-APSK degradation in dB from 0.0 to 9.9
uu=64-APSK degradation in dB from 0.0 to 9.9
EXAMPLE: <0/ADC=0305071720 (sets QPSK degradation to 0.3 dB, 8PSK degradation to 0.5 dB, 16-APSK
degradation to 0.7 dB, 32-APSK degradation to 1.7 dB, and 64-APSK to 2.0 dB)
5 bytes Query only.
Returns the value of the remote demod Es/No, in dB, in 0.1 dB steps, in the form sxx.x.
EXAMPLE: <0/RES?
<0/RES=+12.4 (Es/No=12.4 dB)
NOTE: Responds with +99.9 when demod is unlocked or >23.5 if Es/No value is out of range.
5 bytes Query only.
Returns the value of Local Es/No, in dB, in 0.1 dB steps, in the form sxx.x.
EXAMPLE: <0/LES?
>0000/LES=+12.3 (Es/No=12.3 dB)
NOTE: Responds with +99.9 when demod is unlocked or >23.5 if Es/No value is out of range.
8–27
Revision 3
MN-CDM760
Target-to-Controller
(see Description of Arguments)
Response to Response to
Command Query
ACM= ACM=mmMMA
ACM? TT
ACM*
ACM#
ADC= ADC=qqeessttu
ADC? u
ADC*
ACC#
N/A RES=sxx.x
N/A LES=sxx.x