Comtech EF Data CDM-625 - Manual (Page 499)

CDM-625 Advanced Satellite Modem Revision 15
Appendix D MN-CDM625
D–35
Parameter
Type
Command
(Instruction
& Qualifier)
Number of
Arguments
Description of Arguments
Response to
Command
Query
(Instruction &
Qualifier)
Response to
Query
Request to
Send
RTS= 1 byte, value of
0, 1, 2
Command or Query.
Defines how RTS/CTS will operate at the main data interface in the form x, where:
0=RTS/CTS Loop, No Action. RTS and CTS are looped, so that CTS echoes the state of RTS, but RTS
does not control the ON/OFF state of carrier.
1=Loop, RTS Controls TX O/P. RTS and CTS are looped, so that CTS echoes the state of RTS and
RTS controls the ON/OFF state of carrier (in order words, the modem will not bring up its TX carrier
until RTS is asserted.
2=Ignore RTS, Assert CTS.
Example: RTS=0 (RTS/CTS Loop, No Action)
RTS=
RTS?
RTS*
RTS#
RTS? RTS=x
(see Description of
Arguments)
HSSI
Handshake
Control
HHC= 1 byte, value of
0,1
Command or Query. (HSSI parameter)
Defines TA/CA control of the HSSI interface in the form x, where:
0 = TA to CA loop (default)
1 = RR control CA, TA control Tx output.
Example: HHC=0 (TA to CA loop)
HHC=
HHC?
HHC*
HHC#
HHC? HHC=x
(see Description of
Arguments)
POCO
feature
(Power-On
Carrier-Off)
PCO= 1 byte, value of
0,1
Command or Query.
Use with caution.
If enabled, when a modem is power cycled, it will power up with the Tx carrier setting OFF.
0=POCO disabled (normal operation)
1=POCO enabled – care!
Example: PCO=0 (disabled – normal operation)
PCO=
PCO?
PCO*
PCO#
PCO? PCO=x
(see Description of
Arguments)
DoubleTalk
Carrier-in-
Carrier (CnC)
Mode
CNM= 1 byte, value of
0 to 9
Command or Query.
CnC enable in the form x, where:
0=Off
1=On (normal)
2=APC, C-Band, Side A
3=APC, X-Band, Side A
4=APC, Ku-Band, Side A
5=APC, Ka-Band, Side A
6=APC, C-Band, Side B
7=APC, X-Band, Side B
8=APC, Ku-Band, Side B
9=APC, Ka-Band, Side B
Notes:
1. CnC may be enabled only if:
• The optional plug-in hardware CnC card has been installed AND a CnC FAST option is unlocked.
• The range of permitted data rates is controlled by a FAST feature code. (Read EID to decode the
installed options for the modem)
2. If CnC-APC is active (APS=22), key transmission/reception (Modulation, FEC type, Code Rate,
Framing, Data Rate, Interface) cannot be modified until CnC-APC is suspended. (Use APC
command to suspend or activate.)
CNM=
CNM?
CNM*
CNM#
CNM? CNM=x
(see Description of
Arguments)