User Interfaces
DMD2401 LB/ST L-Band Satellite Modem and ODU Driver
4-38
TM075 – Rev. 1.3
<DEST ADDR>
Identifies the address of the equipment where the message is to be sent.
(1 byte)
<FSN>
Frame sequence number ensures correct packet acknowledgment and
data transfers. (1 byte)
<OPCODE>
This byte identifies the message type associated with the information
data. The equipment processes the data according to the value in this
field. Return error codes and acknowledgment are also included in this
field. (two bytes)
<...DATA...>
Information data. The number of data bytes in this field is indicated by
the <BYTE COUNT> value.
<CHECKSUM>
The modulo 256 sum of all preceding message bytes excluding the
<SYNC> character. (1 byte)
4.4.9 DMD2401 LB/ST Opcode Command Set
The DMD2401 LB/ST Opcode Command Set is listed below, separated by commands that
control the modulator only, the demodulator only, or the entire module.
4.4.10 Modulator Command Set
Command
Opcode
Query Mod All
2400h
Query Mod Latched Alarms
2405h
Query Mod Current Alarms
2408h
Query Mod Status
240Bh
Query Mod RTS Level
2433h
Command Mod All
2601h
Command Mod Frequency
2602h
Command Mod Data Rate
2604h
Command Mod Modulation Type
2606h
Command Mod Convolutional Encoder
2607h
Command Mod Differential Encoder
2608h
Command Mod Carrier Control
2609h
Command Mod Carrier Selection
260Ah
Command Mod Clock Control
260Bh
Command Mod Clock Polarity
260Ch
Command Mod Drop Mode
260Eh
Command Mod Output Level
260Fh
Command Mod Reed-Solomon Encoder
2610h
Command Mod Spectrum
2611h