143 • HRVS-DN Communication (ModBus Protocol)
_______________________________________________________________________________________________
byte 10: CRC_Low ($XX)
byte 11: CRC_High ($XX)
The HRVS-DN normal response:
byte 1: Serial Link No. ($0B)
byte 2: Function ($10)
byte 3: Starting Address High ($02)
byte 4: Starting Address Low ($F0)
byte 5: No. of Registers High ($00)
byte 6: No. of Registers Low ($01)
byte 7: CRC_Low ($XX)
byte 8: CRC_High ($XX)
16.10 Discrete Commands (Coils, 0x References)
The HRVS-DN incorporates 16 "Coils", (bit parameters), from which only 3 are operative. The other 13 are
reserved and were incorporated to enable the user to use word (16 bits) type parameters. Coil # is 1"1
based". The actual address is 1 lower than coil #. For example coil #1 is addressed as 0 (00000). Use
functions 5 or 15 to send control commands to the starter.
The coils have the following 0x references:
Coil # Coil Address Use in HRVS-DN Comment
1 0 Reserved.
2 1 Reserved.
3 2 Reserved.
4 3 Start/Stop Relay Write "1" (ON) to Start / Run.
Write "0" (OFF) to Stop.
5 4 Dual Adjust Write "1" (ON) to turn On.
Write "0" (OFF) to turn Off.
6 5 Reserved.
7 6 Reserved.
8 7 Reset Write "1" (ON) momentarily to Reset.
Rejected, if given together with Start command.
9..16 8..15 Reserved
Example 6 - Read Coils:
To read coils 1..8 status of HRVS-DN # 10, the host computer sends the following Query frame:
byte 1: Serial Link No. ($0A)
byte 2: Function ($01)
byte 3: Starting Address High ($00)
byte 4: Starting 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)
The HRVS-DN response, when coils 7..0 are OFF OFF OFF ON OFF ON OFF OFF:
byte 1: Serial Link No. ($0A)
byte 2: Function ($01)
byte 3: Byte Count ($01)
byte 4: Data (coils 7..0) ($14)
byte 5: CRC_Low ($XX)
byte 6: CRC_High ($XX)
Example 7 - Force Single Coil:
To start the motor controlled by HRVS-DN # 1, the host computer writes "1" to the "START/STOP COIL" (coil
4 addressed as 3) .
To Next Page
Loading...
Need help?
General
