CAS CI-170A, Owner'S Manual, Page: 64 / 79

65
FUNCTION 3: Read holding registers
Request
Address Funcion
Register1
Address
No. register 2 bytes
A 0x03 0x0000 0x0002 CRC
Total. bytes = 8
Reply
Address Funcion No.bytes Register1 Register2 2 bytes
A 0x03 0x04 0x0064 0x00C8 CRC
Total. bytes = 3 + 2*No. re 2
-number of register = number of modbus register to be read, start at address 1 register.
-number of byte = number of bytes in the following data
FUNCTION 16: Preset multiple registers
Request
Addr Funcion
Add.
Reg.1
No.reg. No. bytes
Val. Reg.
1
Val. Reg.
2
2 bytes
A 0x10 0x0000 0x0002 0x4 0x0000 0x0000 CRC
Total. bytes = 7 + 2*No. re 2
Reply
Address Funcion Add.Reg.1 No.reg. 2 bytes
A 0x10 0x0000 0x0002 CRC
Total. bytes = 8
-No. registers = number of modbus register to be read, start at address 1 register
-No. bytes = Number of following data bytes
-Val.reg.1 = Content of starting register
In the reply, the number of converted redcodes starting from address 1 is included.