Watlow 97 series, User Manual

Page: 67 / 89

Packet format: | nn | nn | nn nn… | nn nn |
∆ ∆ ∆ ∆ ∆ ∆
address
command
registers and/or data
CRC
Read Multiple Registers Command (0x03 or 0x04)
This command returns from 1 to 32 registers.
Packet sent to controller:| nn | 03 | nn nn | 00 nn | nn nn |
∆ ∆ ∆ ∆ ∆ ∆ ∆ ∆
controller address (one byte)
read command (0x03 or 0x04)
starting register high byte
starting register low byte
number of registers high byte (0x00)
number of registers low byte
CRC low byte
CRC high byte
Packet returned by controller: | nn | 03 | nn | nn nn… nn nn | nn nn |
∆ ∆ ∆ ∆ ∆ ∆ ∆ ∆ ∆
controller address (one byte)
read command (0x03 or 0x04)
number of bytes (one byte)
first register data high byte
first register data low byte
register n data high byte
register n data low byte
CRC low byte
CRC high byte
Wa t l o w S e r i e s 9 7 A p p e n d i x
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A . 5