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Serial Interface Operation
CDM-760 Advanced High-Speed Trunking Modem
Controller-to-Target
Instruction Code and
Qualifier
Parameter Type
Command
Query
CnC
N/A
CRM?
Ratio Monitor
CnC
N/A
CDM?
Delay Monitor
CnC
N/A
CFM?
Freq Offset Monitor
Rx BERT Pattern
RBP=
RBP?
Tx BERT Pattern
TBP=
TBP?
BERT Error Insert
BKE=
N/A
Arguments for
Description of Arguments
Command or
(Note that all arguments are ASCII numeric codes from 48 to 57)
Query
4 bytes
Query only.
When CnC is enabled and the modem is locked, it monitors the ratio between the interferer and the desired power.
Ratio is returned, in dB, in the form xxxx.
EXAMPLE: <0/CRM?
RESPONSE EXAMPLE 1: >0000/CRM=+02 (interferer > desired) (format:=sdd)
RESPONSE EXAMPLE 2: >0000/CRM=LT11 (less than –11 dB)
RESPONSE EXAMPLE 3: >0000/CRM=GT11 (greater than +11 dB)
RESPONSE EXAMPLE 4: >0000/CRM=99.9 (not locked or CnC not enabled)
6 bytes
Query only.
When CnC is enabled and the modem is locked, it monitors the delay, in microseconds (µs), of the interferer. Delay is
returned in the form xxxxxx.
EXAMPLE: <0/CDM?
RESPONSE EXAMPLE 1: >0000/CDM=229500 (returns 229,500 µs or 229.5 ms)
RESPONSE EXAMPLE 2: >0000/CDM=999999 (not locked or CnC not enabled)
6 bytes
Query only.
When CnC is enabled, an estimated frequency offset, in kHz, will be calculated between desired and interferer,
Frequency offset is returned in the form xxxx.x.
EXAMPLE: <0/CFM?
RESPONSE EXAMPLE 1: >0000/CFM=+001.0 (1 kHz)
RESPONSE EXAMPLE 2: >0000/CFM=9999.9 (not locked or CnC not enabled)
1 byte, value of 0
Command or Query.
thru 6
Sets or returns the PN loopback pattern type in the form x, where:
0=2^23-1 (DEFAULT)
1=Reserved
2=Reserved
3=Reserved
4=Reserved
5=2047
6=2^15-1
EXAMPLE: <0/RBP=0 (default 2^23-1)
1 byte, value of 0
Command or Query.
thru 6
Initialises the PN loopback functionality and sets the pattern type in the form x, where:
0=2^23-1
1=Reserved
2=Reserved
3=Reserved
4=Reserved
5=2047
6=2^15-1
EXAMPLE: <0/TBP=0 (default 2^23-1)
None
Command only.
Inserts a single error.
THIS COMMAND TAKES NO ARGUMENTS.
8–43
Revision 3
MN-CDM760
Target-to-Controller
(see Description of Arguments)
Response to
Response to
Command
Query
N/A
CRM=xxxx
N/A
CDM=xxxxxx
N/A
CFM=xxxx.x
RBP=
RBP=
RBP?
RBP*
RBP#
TBP=
TBP=
TBP?
TBP*
TBP#
BKE=
N/A
BKE?
BKE#
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