Comtech EF Data CDM-750 Installation And Operation Manual page 197

CDM-750 Advanced High-Speed Trunking Modem
Serial-based Remote Product Management
Command
Parameter Number of
(Instruction
Type Arguments
& Qualifier)
External EFR= 1 byte, value
Frequency of 0 thru 5
Reference
Adjustment for ADJ= 4 bytes,
the Internal numeric
10MHz High-
stability
Reference
Unit Test TST= 1 byte, value
Mode of 0 thru 8
Description of Arguments
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)
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.
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)
7–19
Revision 2
MN-CDM750
Query
Response to
(Instruction & Response to Query
Command
Qualifier)
EFR= EFR? EFR=x
EFR? (see Description of
EFR* Arguments)
EFR#
ADJ= ADJ? ADJ=sddd
ADJ? (see Description of
ADJ* Arguments)
ADJ#
TST= TST? TST=x
TST? (see Description of
TST* Arguments)
TST#