GE DigitalFlow GS868, Programming Manual

Page: 54 / 171

March 2008
1-46 Programming Site Data
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)
MODBUS
Reg #
DPR
Hex Addr Description
Scaling
(decimal places) Size in Bytes
61 78 Ch2 Sig Strength Upstream 1 4 (2 16-bit int)
63 7C Ch2 Sig Strength Downstream 1 4 (2 16-bit int)
65 80 Ch2 Temperature 2 4 (2 16-bit int)
67 84 Ch2 Pressure 3 4 (2 16-bit int)
69 88 Avg Velocity 2 4 (2 16-bit int)
71 8C Avg Act Volumetric #Q DIGITS 4 (IEEE 32 bit)
73 90 Avg Std Volumetric #Q DIGITS 4 (IEEE 32 bit)
75 94 Avg Fwd Totals #T DIGITS 4 (2 16 bit int)
77 98 Avg Rev Totals #T DIGITS 4 (2 16 bit int)
79 9C Avg #Tot Digits 0 2
80 9E Avg Mass Flow #M DIGITS 4 (IEEE 32 bit)
82 A2 Avg Fwd Mass Totals #MT DIGITS 4 (2 16-bit int)
84 A6 Avg Rev Mass Totals #MT DIGITS 4 (2 16-bit int)
86 AA Avg #Mass Tot Digits 0 2
87 AC Avg Timer 2 4 (2 16-bit int)
89 B0
5
Avg Error Code
0 2
90 B2 Avg Sound Speed 3 4 (2 16-bit int)
508 3F6
2
MODBUS baud rate
0 2
509 3F8
3
MODBUS parity
0 2
510 3FA
4
MODBUS stop bits
0 2
511 3FC MODBUS meter addr 0 2
512 3FE RESERVED --- ---
Table 1-12: MODBUS Registers for a 2-Channel GS868 (Continued)