Watlow Series 97 - Manual (Page 68)

A . 6 ■ 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 00 61 79 AC
Message: 97 (0x0061).
Example: Read register 1 and 2 (Serial number 1 and Serial number 2) 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 702 (High limit set point) to 200 (0x00C8) on controller at
address 9.
Sent: 09 06 02 BE 00 C8 E8 88
Received: 09 06 02 BE 00 C8 E8 88
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).
NOTE: For more information about communicating with Watlow controllers, go to www.watlow.com and download the
Data Communications Reference: Electronic User’s Manual. It is located under Literature, User’s Manuals, English and
search on data communications reference.