Watlow CPC400 - Manual (Page 207)

CPC400 Series User’s Guide Appendix A: Modbus Protocol
Doc. 0600-2900-2000 Watlow Anafaze 193
Preset Multiple Registers 16
Presets values into the sequence of holding registers (4X
references). When broadcast, the function presets the same
register references in all attached slaves.
Examples
Read Examples
The data read must be sequentially located. Table A.3 on
page 193 shows the query and Table A.4 on page 193 shows
the response:
Table A.3 Sample Packet for Host Query
Table A.4 Sample Packet for Slave Response
Example
Slave
Address
Function
Start Address
Number of
Points
CRC
High
Byte Low
Byte
High Low
Read process variable
of loop 2 from control-
ler with address 1
01 03 00 DE 00 01 E4 30
Read set points of
loops 4 and 5 (500
and 600) from control-
ler with address 3
03 03 00 CF 00 02 F5 D6
Example
Slave
Address
Func-
tion
Byte
Count
Data 1 Data 2
CRC
High Low High Low
Read process variable
of loop 2 from control-
ler with address 1
01 03 02 06 40 BA 14
Read set points of
loops 4 and 5 (500
and 600) from control-
ler with address 3
03 03 04 01 F4 02 58 99 67