Comtech EF Data CDM-500 - Manual (Page 75)

Remote Control CDM-500 Closed Network Satellite Modem
B–10 Rev. 1.3
Parameter
Type Command
(Instruction
Code and
qualifier) Arguments
for Command
or Response to
Query Description of arguments
(note that all arguments are ASCII numeric codes,
that is, ASCII codes between 48 and 57) Response to
Command (target to
controller) Query
(Instruction
Code and
qualifier) Response to
query (target
to controller)
Eb/No Alarm
Point EBA= 4 bytes,
numerical
Command or Query.
Eb/No alarm point, with a range of Eb/No between 2
and 16 dB. Resolution 0.1 dB.
Example: EBA=12.3 (which is Eb/No = 12.3 dB) EBA= (message ok)
EBA? (received ok,
but invalid arguments
found) EBA? EBA=xx.x
(same format as
command
arguments)
Rx Buffer
Size RBS= 1 byte, value of
1,2,3,4 or 5 Command or Query.
Rx buffer size, where:
1 = +/- 256 bits
2 = +/- 512 bits
3 = +/- 1024 bits
4 = +/- 2048 bits
5 = +/- 4096 bits RBS= (message ok)
RBS? (received ok,
but invalid argument
found)
RBS* (message ok,
but not permitted in
current mode) RBS? RBS=x
(same format as
command
argument)
Unit Interface
Type ITF= 1 byte, value of
1,2 or 3 Command or Query.
Terrestrial interface type, where:
1 = RS422/EIA530 DCE,
2 = V.35 DCE
3 = RS232 (sync).
All other codes invalid. Example: ITF=2 (V.35) ITF= (message ok)
ITF? (received ok,
but invalid args
found)
ITF* (message ok,
but argument) not
permitted in current
mode) ITF? ITF=x (same
format as
command
Unit Framing
Mode FRM= 1 byte, value of
0 or 1 Command or Query.
Unit operating mode, where
0 = Unframed - transparent (distant-end M&C not
possible)
1 = Framed (EDMAC distant-end M&C possible)
Example: FRM=1 (which is framed) FRM= (message ok)
FRM? (received ok,
but invalid argument
found)
FRM* (message ok,
but not permitted in
current mode) FRM? FRM=x (same
format as
command
argument)
Unit Test
Mode TST= 1 byte, value of
0,1,2,3,4 or 5 0 = Normal
1 = IF loopback
2 = Digital loopback
3 = I/O loopback
4 = Tx CW
5 = Tx Alternating 1,0 pattern
All other codes invalid.
Example TST=4 (which is transmit CW) TST= (message ok)
TST? (received ok,
but invalid argument
found)
TST* (message ok,
but not permitted in
current mode) TST? TST=x (same
format as
command
argument)
Unit IF
Impedance IMP= 1 byte, value of
5 or 7 Command or Query.
IF interface impedance, where:
5 = 50 ohms
7 = 75 ohms
All other codes invalid. Example IMP=7 ( 75 ohms) IMP= (message ok)
IMP? (received ok,
but invalid argument
found) IMP? IMP=x (same
format as
command
argument)