GE PanaFlow XMT1000

PanaFlow™ XMT1000 User’s Manual 35
Appendix B. Modbus Communication
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
Table 6: XMT1000 Modbus Register Map - Revision 4.19
Reg #
in Hex
Access
Level
Register ID Description Units RO/RW
Size in
Bytes
Format
Health Check + Identification (Input Registers)
210 210 NONE Product Type unitless RO 4 INT32
System Real RW
400
System Int RW
500 500 Operator eUnit_ActVol Global Unit group 1 for
Actual Volumetric
unitless RW 4 INT32
502 Operator eUnit_Day Global Unit group 2 for
Day
unitless RW 4 INT32
504 Operator eUnit_Db Global Unit group 3 for
dB
unitless RW 4 INT32
506 Operator eUnit_Dens Global Unit group 4 for
Density
unitless RW 4 INT32
508 Operator eUnit_Diam Global Unit group 5 for
Dimension
unitless RW 4 INT32
50A Operator eUnit_Hz Global Unit group 6 for
Hz
unitless RW 4 INT32
50C Operator eUnit_Kv Global Unit group 7 for
Viscosity
unitless RW 4 INT32
50E Operator eUnit_mA Global Unit group 8 for
mA
unitless RW 4 INT32
510 Operator eUnit_Mass Global Unit group 9 for
Mass
unitless RW 4 INT32
512 Operator eUnit_MS Global Unit group 10 for
Milli Second
unitless RW 4 INT32