Armstrong DRV40 Installations- und Betriebshandbuch - Seite 11
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Seite druckenCommunications Standard
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Baud Rate 9600
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Parity None
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Data bits 8
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Stop Bits 1
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Mode RTU
Modbus Functions Supported
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Read Holding Registers (0x03)
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Write Single Register (0x06)
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Write Multiple registers (0x10)
Modbus Error Codes
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Illegal Address (Write Error 2) - Returned if the read or write register address is outside the address range.
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llegal Data (Write Error 3) - Returned if the data being written to the register is outside the bounds for that register or
the valve is not configured to accept such data.
•
Slave Failure (Write Error 4) - Returned if the connected DRV cannot be identified.
General Data Description
The valve data is divided as follows:
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Prime data section: Registers 1 through 11 - This is active data and represents the actual status of the valve.
•
Commands: Registers 306 through 314 - Logic commands used to instruct the valve into different modes e.g. reboot,
thermal disinfection.
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Configuration and Log Data: Registers 23 through 464 - This data is typically stored in non-volatile memory within the
valve. Configuration data is used to control the DRV. Log data is also stored for various data and usage logging/error
recording.
The DRV acts as the Modbus slave unit or RTU and keeps its registers synchronised with the internal database. Following
a successful write command, the DRV internal database is updated with new settings/values. At least 5 seconds should be
allowed between Modbus writes and subsequent reads to allow adequate time for the microprocessor to handle the command/
requests as well as physical mechanical movement of parts to complete in response to the request.
Armstrong International
IOM-776
Brain
®
Modbus Networking