Comtech EF Data CDM-760, Installation And Operation Manual

Page: 270 / 441

Serial Interface Operation Revision 3
CDM-760 Advanced High-Speed Trunking Modem MN-CDM760
8–27
8.5.6 ACM Parameters
Parameter Type
Controller-to-Target
Instruction Code and
Qualifier
Arguments for
Command or
Query
Description of Arguments
(Note that all arguments are ASCII numeric codes from 48 to 57)
Target-to-Controller
(see Description of Arguments)
Command Query
Response to
Command
Response to
Query
ACM Operating
Parameters
ACM= ACM? 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.)
ACM=
ACM?
ACM*
ACM#
ACM=mmMMA
TT
ACM Degradation
Configuration
ADC= ADC? 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)
ADC=
ADC?
ADC*
ACC#
ADC=qqeessttu
u
Remote
Signal to Noise
Ratio
N/A RES? 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.
N/A RES=sxx.x
Local
Signal to Noise
Ratio
N/A LES? 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.
N/A LES=sxx.x