D1 is a byte representing the invalid command code. It is defined as follows:
D1
bit 7 (parity)
bit 6 1
bit 5 1
bit 4 1
bit 3 0
bit 2 0
bit 1 command not executed
bit 0 command/data invalid
6.5 Application Notes
The following application notes apply to amplifiers with operating software SAMOS
issue 1 or higher.
Before attempting to control the amplifier using the RS-485 4-wire multi-drop bus,
check the following:
* Ensure that the data connector is correctly wired (Rx+, Rx7 are not reversed
etc.)
* Check that the amplifier data rate is the same as that of the master (should be
set to 9600 baud).
* Ensure that the amplifier has a unique address.
* Check that the master has the same data format as the amplifier (1 start bit, 7
data bits, EVEN parity and 1 stop bit).
HBN63xx-1, Issue 8, Page 40
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