Comtech EF Data LTT1450G - Manual (Page 30)

Serial Interface Protocol LTT1450G Ku-Band Loop Test Translator
Page 5-2 TM063 - Rev. 1
5.2.2 Control Commands
Control commands allow the user to select the desired translator band and to control the level of signal
attenuation. When a control command is issued the current settings of the translator will be changed.
The remote light will light to indicate that the setting was requested remotely. In the case of attenuation,
the remote light indicates that the value displayed by the thumbwheel switches may not be the true
value. If a band selection or attenuation value is selected from the front panel while the unit is in remote
control, operation of the translator will revert to the front panel and the remote light will be extinguished
5.2.2.1 Set-Attenuation
The Set Attenuation command sets the level of attenuation in dB from 0 to 39 dB for the selected band.
The command structure is as follows:
MMA{##}{CR}
The two numbers are ASCII character (0-9) values, tens and units, of dB of attenuation.
5.2.2.2 Force Update from Front Panel Switches and Enter Local Mode
The LOCAL command forces an update from the front panel switch settings and puts the unit in local
mode. The command structure is as follows:
MMLOC{CR}
5.2.2.3 Set-Band
The Select band command selects one of 2 translator frequency conversion bands. The set band
command is 3 byte in length consisting of the following:
MMB{#}{CR}
where {#} is the ASCII number from 0 through 4 where:
0 = Mute
1 = 2.225 GHz
5.3 Status Commands
5.3.1 Return Analog-to-Digital Converter Value
The command is as follows:
MMR{#}{cr}
Allows the operator to read ADC input #, where # must be from 0 to 7.
A/D INPUT #
0 Ku-Primary loop voltage