A . 6
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A p p e n d i x
Wa t l o w S e r i e s 9 7
Example: Read register 0 (model number) of the controller at address 1.
Sent:
01 03 00 00 00 01 84 0A
Received:
01 03 02 03 DC B9 2D
Message:
988 (0x03DC).
Example: Read register 1 and 2 (Process 1 and 2 values) of controller at address
5.
Sent:
05 03 00 01 00 02 94 4F
Received:
05 03 04 00 64 00 C8 FF BA
Message:
100 (0x0064) and 200 (0x00C8).
Write to a Single Register Command (0x06)
This command writes a parameter to a single register. The controller will echo
back the command. An attempt to write to a read-only parameter returns an
illegal data address error (0x02).
Packet sent to controller:| nn | 06 | nn nn | nn nn | nn nn |
∆
∆
∆ ∆
∆ ∆
∆ ∆
controller address (one byte)
write to a register command (0x06)
register high byte
register low byte
data high byte
data low byte
CRC low byte
CRC high byte
Example: Set register 7 (SPI) to 200 (0x00C8) on controller at address 9.
Sent:
09 06 00 07 00 C8 38 D5
Received:
09 06 00 07 00 C8 38 D5
Write to Multiple Registers Command (0x10)
This command actually writes a parameter to only a single register. An attempt
to write to a read-only parameter returns an illegal data address error (0x02).
