D1 is a byte representing the invalid command code. It is defined as follows:
D1 Function
bit 7
Parity
bit 6
0
bit 5
0
bit 4
0
bit 3
0
bit 2
0
bit 1
0
bit 0
1 = command not executed
0 = command/data invalid
6.4 APPLICATION
NOTES
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 +, Rx- 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).
If the amplifier is being controlled using the two-wire system.
•
Link b with d, and c with e.
© e2v technologies (uk) limited 2010
DAS768892AA
Version
1,
page
34
