Appendix B. Modbus Communication; Modbus Protocol; Modbus Register Map - GE PanaFlow XMT1000 User Manual

Appendix B. Modbus Communication

B.1 Modbus Protocol
In general, the PanaFlow XMT1000 flow meter 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 flow meter.
Listed below are two limits of this implementation:
•
The PanaFlow XMT1000 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).
and
•
The flow meter needs a 15 msec gap between Modbus requests. The prime objective of the flow meter is to
measure flow, so the Modbus server has a low priority.
B.2 Modbus Register Map
Reg # Access
in Hex Level
Health Check + Identification (Input Registers)
210 210 NONE
System Real RW
400
System Int RW
500 500 Operator eUnit_ActVol Global Unit group 1 for
502 Operator
504 Operator
506 Operator
508 Operator
50A Operator
50C Operator
50E Operator
510 Operator
512 Operator
PanaFlow™ XMT1000 User's Manual
Table 6: XMT1000 Modbus Register Map - Revision 4.19
Register ID Description
Product Type
Actual Volumetric
eUnit_Day Global Unit group 2 for
Day
eUnit_Db Global Unit group 3 for
dB
eUnit_Dens Global Unit group 4 for
Density
eUnit_Diam Global Unit group 5 for
Dimension
eUnit_Hz Global Unit group 6 for
Hz
eUnit_Kv Global Unit group 7 for
Viscosity
eUnit_mA Global Unit group 8 for
mA
eUnit_Mass Global Unit group 9 for
Mass
eUnit_MS Global Unit group 10 for
Milli Second
Appendix B. Modbus Communication
Size in
Units RO/RW Bytes
unitless RO
unitless RW
unitless RW
unitless RW
unitless RW
unitless RW
unitless RW
unitless RW
unitless RW
unitless RW
unitless RW
Format
4 INT32
4 INT32
4 INT32
4 INT32
4 INT32
4 INT32
4 INT32
4 INT32
4 INT32
4 INT32
4 INT32
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