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CDM-500 Closed Network Satellite Modem
Parameter
Command
Arguments
Type
(Instruction
for Command
Code and
or Response to
qualifier)
Query
Unit Alarm
MSK=
5 bytes, each
Mask
with a value of
0 or 1
EDMAC
ESA=
4 bytes,
Slave Address
numerical
Circuit ID
CID=
24 bytes,
string
ASCII
Outdoor Unit
ODU=
1 byte, of 0 or
Comms
1 value
Rev. 1.3
Description of arguments
(note that all arguments are ASCII numeric codes,
that is, ASCII codes between 48 and 57)
Command or Query.
Alarm mask conditions, in the form abcde, where:
a = mask Tx AIS alarm, b = mask Rx AGC alarm
c = mask buffer alarms, d = mask Rx AIS alarm
e = mask Eb/No alarm
Setting any of these bytes to 0 unmasks alarm, setting
to 1 masks them. Example: MSK=01011
Command or Query.
EDMAC Slave Address - sets the range of addresses
of distant-end units (modems or transceivers) which
this unit will forward messages for. Only values
which are integer multiples of ten are permitted.
(0010, 0020, 0030, 0040 etc.)
Example: ESA=0890
Important Note: Setting the value of the EDMAC
Slave Address to 0000 disables this function. Setting
a valid address here will automatically define the
unit as being an EDMAC Master.
This command is only valid for an EDMAC master.
When used as a Query, it may be sent to an EDMAC
slave, which will respond with the appropriate
address.
Command or Query.
Sets or queries the user-defined Circuit ID string,
which is a fixed length of 24 characters.
Valid characters include:
Space ( ) * + - , . / 0-9 and A-Z
Command or Query.
Enables or disables communication, via an FSK serial
link, with a Comtech Transceiver (Outdoor unit).
0 = disabled
1 = enabled
Example: ODU=0
Response to
Query
Command (target to
(Instruction
controller)
Code and
qualifier)
MSK= (message ok)
MSK?
MSK? (received ok,
but invalid arguments
found)
MSK* (message ok,
but not permitted in
current mode)
ESA= (message ok)
ESA?
ESA? (received ok,
but invalid arguments
found) ESA*
(message ok, but not
permitted in current
mode – for example
if ESA= is sent to a
distant-end slave
unit)
CID= (message ok)
CID?
CID? (received ok,
but invalid arguments
found)
ODU= (message ok)
ODU?
ODU? (received ok,
but invalid arguments
found) ODU*
(message ok, but not
permitted in current
mode
Remote Control
Response to
query (target
to controller)
MSK=abcde
(same format as
command
arguments)
ESA=xxxx
(same format as
command
arguments)
CID=xxxxxxxx
xxxxxxxxxxxx
xxx (same
format as
command
arguments)
ODU=x (same
format as
command
arguments)
B–11
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