DigitalFlow™ GF868 Programming Manual (1-Channel) 33
Chapter 1. Programming Site Data
1.12.3a Notes:
1. Clear Totalizers: flag from the 8051 to clear either the Channel 1 or Channel 2 totalizers.
2. MODBUS baud rate: 5 = 2400, 6 = 4800, 7 = 9600, 8=19,200
3. MODBUS parity: 0 = none, 1 = odd, 2 = even
4. MODBUS stop bits: 1 = 1 stop bit, 2 = 2 stop bits
5. AVG Error Code: 0=Both Ch1 and Ch2 are in error.
1=Ch1 only is in error
2=Ch2 only is in error
3=Both channels are error free
6. You must scale measurements in the host system. For example, velocity scaling is two decimal places; thus, if the
MODBUS card reports that the velocity is 100, the host system must interpret the number as 1.00 (two decimal
places).
Table 4: MODBUS Registers for a 1-Channel GF868
MODBUS
Reg #
DPR
Hex Addr Description
Scaling
(decimal places) Size in Bytes
10
1”
Clear Ch1 Totalizers”
-- 2 (16 bit signed)
2 2 Not Used -- 2 (16 bit signed)
3 4 Velocity 2 4 (2 16-bit int)
5 8 Act Volumetric #Q DIGITS 4 (IEEE 32 bit)
7 C Std Volumetric #Q DIGITS 4 (IEEE 32 bit)
9 10 Fwd Totals #T DIGITS 4 (2 16 bit int)
11 14 Rev Totals #T DIGITS 4 (2 16 bit int)
13 18 #Tot Digits 0 2
14 1A Mass Flow #M DIGITS 4 (IEEE 32 bit)
16 1E Fwd Mass Totals #MT DIGITS 4 (2 16-bit int)
18 22 Rev Mass Totals #MT DIGITS 4 (2 16-bit int)
20 26 #Mass Tot Digits 0 2
21 28 Timer 2 4 (2 16-bit int)
23 2C Error Code 0 2
24 2E Sound Speed 3 4 (2 16-bit int)
26 32 Molecular Weight 4 4 (2 16-bit int)
28 36 Signal Strength Upstream 1 4 (2 16-bit int)
30 3A Signal Strength Downstream 1 4 (2 16-bit int)
32 3E Temperature 2 4 (2 16-bit int)
34 42 Pressure 3 4 (2 16-bit int)
508 3F6
2
MODBUS baud rate
02
509 3F8
3
MODBUS parity
02
510 3FA
4
MODBUS stop bits
02
511 3FC MODBUS meter addr 0 2
512 3FE RESERVED --- ---
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