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Remote Control
Parameter
Command
Arguments
Type
(Instruction
for Command
Code and
or Response to
qualifier)
Query
Eb/No Alarm
EBA=
4 bytes,
Point
numerical
Rx Buffer
RBS=
1 byte, value of
Size
1,2,3,4 or 5
Unit Interface
ITF=
1 byte, value of
Type
1,2 or 3
Unit Framing
FRM=
1 byte, value of
Mode
0 or 1
Unit Test
TST= 1
byte, value of
Mode
0,1,2,3,4 or 5
Unit IF
IMP=
1 byte, value of
Impedance
5 or 7
B–10
Description of arguments
(note that all arguments are ASCII numeric codes,
that is, ASCII codes between 48 and 57)
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)
Command or Query.
Rx buffer size, where:
1 = +/- 256 bits
2 = +/- 512 bits
3 = +/- 1024 bits
4 = +/- 2048 bits
5 = +/- 4096 bits
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)
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)
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)
Command or Query.
IF interface impedance, where:
5 = 50 ohms
7 = 75 ohms
All other codes invalid. Example IMP=7 ( 75 ohms)
CDM-500 Closed Network Satellite Modem
Response to
Query
Command (target to
(Instruction
controller)
Code and
qualifier)
EBA= (message ok)
EBA?
EBA? (received ok,
but invalid arguments
found)
RBS= (message ok)
RBS?
RBS? (received ok,
but invalid argument
found)
RBS* (message ok,
but not permitted in
current mode)
ITF= (message ok)
ITF?
ITF? (received ok,
but invalid args
found)
ITF* (message ok,
but argument) not
permitted in current
mode)
FRM= (message ok)
FRM?
FRM? (received ok,
but invalid argument
found)
FRM* (message ok,
but not permitted in
current mode)
TST= (message ok)
TST?
TST? (received ok,
but invalid argument
found)
TST* (message ok,
but not permitted in
current mode)
IMP= (message ok)
IMP?
IMP? (received ok,
but invalid argument
found)
Response to
query (target
to controller)
EBA=xx.x
(same format as
command
arguments)
RBS=x
(same format as
command
argument)
ITF=x (same
format as
command
FRM=x (same
format as
command
argument)
TST=x (same
format as
command
argument)
IMP=x (same
format as
command
argument)
Rev. 1.3
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