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PanaFlow HT User’s Manual
127
Appendix C. Modbus Map
C.5 Modbus Protocol
In general, the PanaFlow HT flowmeter follows the standard Modbus communications protocol defined by the
reference MODBUS APPLICATION PROTOCOL SPECIFICATION V1.1b. This specification is available at
www.modbus.org on the Internet. With this reference as a guide, an operator could use any Modbus master to
communicate with the flowmeter.
Listed below are two limits of this implementation:
1.
The PanaFlow HT supports only four of the standard function codes. These are Read Holding Registers (0x03),
Read Input Registers (0x04), Write Multiple Registers (0x10), and Read File Record (0x14).
2.
The flowmeter needs a 15 msec gap between Modbus requests. The prime objective of the flowmeter is to measure
flow and drive the SIL output, so the Modbus server has a low priority.
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