Comtech EF Data CDM-750, Installation And Operation Manual

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CDM-750 Advanced High-Speed Trunking Modem Revision 2
Serial-based Remote Product Management MN-CDM750
7–19
Parameter
Type
Command
(Instruction
& Qualifier)
Number of
Arguments
Description of Arguments
Response to
Command
Query
(Instruction &
Qualifier)
Response to Query
External
Frequency
Reference
EFR= 1 byte, value
of 0 thru 5
Command or Query.
Set or return the External Frequency Reference in the form x, where:
0 = Internal 10MHz (default)
1 = External 1 MHz
2 = External 2 MHz
3 = External 5 MHz
4 = External 10 MHz
5 = Internal 10MHz plus output (this means that the Reference is available on the “Ext Ref” rear connector (small
rear-panel LED indicates when ON).
Example: EFR=1 (selects External 1MHz)
EFR=
EFR?
EFR*
EFR#
EFR? EFR=x
(see Description of
Arguments)
Adjustment for
the Internal
10MHz High-
stability
Reference
ADJ= 4 bytes,
numeric Command or Query.
Set or return fine adjustment of the Internal 10MHz Reference on the High-Stability Frequency Reference module
in the form sddd, where:
s = sign (+ or –)
ddd = value, 0-999.
ADJ=
ADJ?
ADJ*
ADJ#
ADJ? ADJ=sddd
(see Description of
Arguments)
Unit Test
Mode
TST= 1 byte, value
of 0 thru 8
Command or Query.
Set or return Unit Test Mode in the form x, where:
0 = Normal Mode (no test)
1 = Tx CW
2 = Dual Side Band (Tx Alternating 1,0 Pattern)
3 = Single Side Band
4 = IQ PN Sequence
5 = RF Loopback (auto configures Rx to match Tx)
6 = IF Loopback
7 = Digital Loopback
8 = I/O Loopback
Example: TST=5 (RF Loopback)
TST=
TST?
TST*
TST#
TST? TST=x
(see Description of
Arguments)