Emerson Micro Motion MVD Direct Connect, Руководство по установке

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28 Direct Connect Meters
MVD Direct Connect communications
If the core processor is attached to a transmitter for any reason (for example, for field
testing), the byte order is automatically set to 1–2–3–4. It may be necessary to reset the
byte order before resuming MVD Direct Connect operation. Byte order is controlled by the
value in register 521. The byte order codes and associated byte orders are listed in
Table
4-3 .
4.4 Additional information
For more information on programming a remote host for use with MVD Direct Connect
systems, see the manual entitled
Modbus Mapping Assignments for Micro Motion
Transmitters .
Table 4-2 Byte contents in Modbus commands and responses
Byte Bits Definitions
1 S E E E E E E E S = Sign
E = Exponent
2 E M M M M M M M E = Exponent
M = Mantissa
3 M M M M M M M M M = Mantissa
4 M M M M M M M M M = Mantissa
Table 4-3 Byte order codes and byte orders
Byte order code Byte order
0 1
–
2
–
3
–
4
1 3
–
4
–
1
–
2
2 2
–
1
–
4
–
3
3 4
–
3
–
2
–
1