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DTM-3237B – DVB-S2X Receiver with DVB-ASI Output
User Manual
Figure 2 below shows the structure of a command or response message written through the serial
interface. If the command is a 'read', the data may be omitted. Note that some settings require an
index.
Figure 2. Message on an USB serial control interface
All commands successfully sent to the DTM-3237B are answered with a copy of the command
including the data bytes.
When an incorrect checksum or an invalid hex value is detected, the DTM-3237B will not return an
answer. When protocol errors are detected, e.g. a combination of a valid category with an invalid
setting, the R/W byte of the reply is replaced with the ASCII character 'E' and the data is removed from
the message.
Please refer to Appendix D for a communication example.
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