Maintenance M7/M7L/M7LT Modular Satellite Modem
3-110 M7/M7L/M7LT - Rev. 0.05
3.11.3. Analog Monitor Input Operation
The modem allows for an analog voltage input at pins 4 (voltage) and 6 (gnd) on connector the rear
panel Alarms connector (J6) to control alarms indications and/or the transmit carrier. The analog
input signal can be set to control the following functions:
Do nothing
Set Alarm A
Set Alarm B
Set Alarm A & B
Mute transmit carrier
Mute transmit carrier & Set Alarm A
Mute transmit carrier & Set Alarm B
Mute transmit carrier & Set Alarm A & B
The <Unit: Monitor – Input Threshold> parameter sets the threshold trigger for the analog input
signal and the <Unit: Monitor – Input Sense> parameter sets whether the analog input is active high
or active low. The <Unit: Test – Monitor Input> parameter is a real time monitor of the voltage at
the analog input. Use the <Unit: Alarm - Monitor Input Mask> parameter to set the action to be
taken by the analog input signal.
3.11.4. RTS Monitor and Output
The modem allows configuration of the Data Interface RTS status onto either the A or B Alarm relay
output on the rear panel Alarms connector J6. Since these relays are Form C, either logic direction
can be chosen for the output to use in controlling other equipment. Control of this feature is <Intf: I/O
– RTS Monitor>. This feature is independent of the <Intf: I/O – RTS> parameter which can be used
to control the Carrier enable via the RTS status.
CAUTION!: Setting this to either Alarm A or B relay will override any other settings going to that
alarm relay.
NOTE: It is the responsibility of the user to set alarms properly when using this unique feature. This
relay control is not de-bounced with a time delay, therefore a fast changing or chattering RTS
signal will cause the relay to chatter.
3.12. Storing and Recalling Configuration
The modem has a built-in function allowing the operator to store the current complete configuration in
one of 99 numbered locations by setting the <Unit: Config - Store> parameter to “1” to “99”
Any stored configuration can then be recalled, including one permanent configuration called “Factory”
which is a set of default configurations by setting the <Unit: Config - Recall> parameter to “Factory”
or “1” to “99”
3.12.1. Automatic Configuration Recovery (ACR)
The modem allows any of the 99 configurations can be set to be automatically recalled in the event of
receive carrier loss after a specified number of seconds. To activate this feature, set the <Unit:
Config – Auto Restore> parameter to “Enable”. Set the time delay before restoring the configuration
in the <Unit: Config – Restore After> parameter and the configuration that is to be restored in the
<Unit: Config – Restore #> parameter.
NOTE: ACR is also commonly used to disable the transmit off after loss of receive carrier.
NOTE: The ACR is not available when the modem is operating in a redundancy mode.
3.13. Burst Mode Operation
NOTE: Burst mode is a special factory request option and not installed in standard modems.
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