145 • HRVS-DN Communication (ModBus Protocol)
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Example 8 - Force Multiple coils:
Motor that is controlled by HRVS-DN # 32 is stopped. Dual Adjust is set to off.
To start the motor using the Dual Adjust parameters , the host computer writes "1" to the Start and Dual Adjust
Coils no. 4 &5, addressed as 3 & 4. One of the many possible ways:
The "Query" frame sent by the host:
byte 1: Serial Link No.
($20)
byte 2: Function
($0F)
byte 3: Coil Address High
($00)
byte 4: Coils address Low
($00)
byte 5: No. of Coils High
($00)
byte 6: No. of coils Low
($08)
byte 7: Byte Count
($01)
byte 8: Force Data
($18)
(coil # 4 & coil # 5)
byte 9: CRC_Low
($XX)
byte 10: CRC_High
($XX)
The normal (if no exception) response:
byte 1: Serial Link No.
($20)
byte 2: Function
($0F)
byte 3: Coil Address High
($00)
byte 4: Coils address Low
($00)
byte 5: No. of Coils High
($00)
byte 6: No. of coils Low
($08)
byte 7: CRC_Low
($XX)
byte 8: CRC_High
($XX)
