Mocomtech CDM-QX - Manual (Page 222)

CDM-Qx/QxL Multi-Channel Satellite Modem with DoubleTalk™ Carrier-in-Carrier® Revision 7
Appendix C MN/CDMQX.IOM
C–4
1. From Controller-to-Target, the only permitted values are:
=
(ASCII code 61 The = code is used as the assignment operator, and is used to indicate that the
parameter defined by the preceding byte should be set to the value of the
argument(s) that follow it. For Example: In a message from Controller-to-Target,
TFQ=0950.0000 would mean ‘set the Tx frequency to 950 MHz’
?
(ASCII code 63) The ? code is used as the query operator, and is used to indicate that the Target
should return the current value of the parameter defined by the preceding byte.
For Example: In a message from Controller-to-Target, TFQ? would mean
‘return the current value of the transmit frequency’.
2. From Target-to-Controller, the only permitted values are:
=
(ASCII code 61)
The = code is used in two ways:
First, if the Controller has sent a query code to a Target (for Example: TFQ?,
meaning ‘what is the Tx frequency?’), the Target would respond with
TFQ=xxxx.xxxx, where xxxx.xxxx represents the frequency in question.
Second, if the Controller sends an instruction to set a parameter to a particular
value, and if the value sent in the argument is valid, then the Target will
acknowledge the message by replying with TFQ= (with no message arguments).
?
(ASCII code 63)
The ? code is only used as follows:
If the Controller sends an instruction to set a parameter to a particular value, then,
if the value sent in the argument is not valid, the Target will acknowledge the
message by replying, for example, with TFQ? (with no message arguments). This
indicates that there was an error in the message sent by the Controller.
*
(ASCII code 42)
The * code is only used as follows:
If the Controller sends an instruction to set a parameter to a particular value, then,
if the value sent in the argument is valid, BUT the modem will not permit that
particular parameter to be changed at that time, the Target will acknowledge the
message by replying, for example, with TFQ* (with no message arguments).
!
(ASCII code 33)
The ! code is only used as follows:
If the Controller sends an instruction code which the Target does not recognize,
the Target will acknowledge the message by echoing the invalid instruction,
followed by the ! character. Example: XYZ!
#
(ASCII code 35)
The # code is only used as follows:
If the Controller sends a correctly formatted command, BUT the modem is not in
remote mode, it will not allow reconfiguration, and will respond with TFQ#.
∼
(ASCII Code 126) The
∼ code is only used as follows:
If a message was sent via a local modem to a distant end device or ODU, the
message was transmitted transparently through the local modem. In the event of
the distant-end device not responding, the local modem would generate a
response. Example: 0001/RET~, indicating that it had finished waiting for a
response and was now ready for further communications.
$
(ASCII code 36)
The target acknowledges the message indicating that there is no module installed
in that Slot.
@
(ASCII code 64)
The target acknowledges the message indicating that a Tx command was sent to
an Rx module or vice-versa. For example: TFQ was sent to a demod.
^
(ASCII Code 94)
The ^ code is only used as follows:
The target acknowledges the message indicating that the unit is in Ethernet mode.
While in Ethernet mode, the unit cannot be serially queried for modem parameters.
This mode will allow the user to access the Web server, SNMP, or Telnet.