Demodulator Status Commands And Queries - Comtec CDM-840 Installation And Operation Manual

CDM-840 Remote Router
Serial-based Remote Product Management
7.3.4

Demodulator Status Commands and Queries

Command Number of
Parameter (Instruction Arguments for
Type Code Command or
& Qualifier) Response to Query
Rx Es/No N/A 4 bytes
Rx Signal N/A 5 bytes
Level
Description of Arguments
(Note that all arguments are ASCII numeric codes from 48 and 57)
Query only.
Returns the value of Es/No in the form xx.x, where:
xx.x=value, in dB, from -1 to -40 (negative sign (-) is implied) in 0.1 dB
increments.
NOTES:
1) The Es/No number correspond to the value that is displayed on HTTP
(via the Virtual Front Panel) or SNMP. This value is averaged in the
background for the previous 16 values.
2) For a faster Es/No reading use REN command.
EXAMPLE: <0/EBN?[cr]
RESPONSE NOTES:
1) Returns 99.9 if demod is unlocked.
2) Returns +040 for values greater than -40.0 dB.
Query only.
Returns the value of the Rx signal level, in dBm, in the form xxxxx, where:
xxxxx=value, in dBm, from -25 to -55 with a tolerance of ±5 dBm, in 0.5 dBm
increments.
EXAMPLE: <0/RSL?[cr]
RESPONSE NOTES:
1) If in the range of -25 to -55 dBm, returns RSL=-xx.y
2) If >-25 dBm, returns SL1=GT-25 (GT='greater than')
3) If <-55 dBm, returns SL1=LT-55 (LT='less than')
7–16
Response to Query
Command (Instruction Response to Query
(Target to Code & (Target to Controller)
Controller) Qualifier)
N/A ESN? ESN=xxxxx
(see Description of
Arguments)
N/A RSL? RSL=xxxxx
(see Description
of Arguments)
MN-CDM840
Revision 3