Requesting Parameters Using Modbus - GE DigitalFlow XGS868i Programming Manual

Chapter 1. Programming Site Data

1.9.4 Requesting Parameters Using MODBUS

To request specific parameters from the XGS868i via the MODBUS, the control system must enter the appropriate
register number. Only registers 1 through 90 are available for MODBUS communications, while registers 508 through
512 are used by the XGS868i to store the MODBUS parameters. For details, see Table 11 below for a 1-Channel meter
or Table 12 on page 39 for a 2-Channel meter.
Note: If you request Channel2 or Averaged data from a 1-Channel meter, the values will all be zero.
MODBUS
Reg # Hex Addr
1
2
3
5
7
9
11
13
14
16
18
20
21
23
24
26
28
30
32
34
508
509
510
511
512
38
Table 11: MODBUS Registers for a 1-Channel XGS868i
DPR
Description
0
1"
Clear Ch1 Totalizers"
2 Not Used
4 Velocity
8 Act Volumetric
C Std Volumetric
10 Fwd Totals
14 Rev Totals
18 #Tot Digits
1A Mass Flow
1E Fwd Mass Totals
22 Rev Mass Totals
26 #Mass Tot Digits
28 Timer
2C Error Code
2E Sound Speed
32 Density
36 Signal Strength Upstream
3A Signal Strength Downstream
3E Temperature
42 Pressure
3F6
2
MODBUS baud rate
3F8
3
MODBUS parity
3FA
4
MODBUS stop bits
3FC MODBUS meter addr
3FE RESERVED
Scaling
(decimal places) Size in Bytes
-- 2 (16 bit signed)
-- 2 (16 bit signed)
2 4 (2 16-bit int)
#Q DIGITS 4 (IEEE 32 bit)
#Q DIGITS 4 (IEEE 32 bit)
#T DIGITS 4 (2 16 bit int)
#T DIGITS 4 (2 16 bit int)
0
#M DIGITS 4 (IEEE 32 bit)
#MT DIGITS 4 (2 16-bit int)
#MT DIGITS 4 (2 16-bit int)
0
2 4 (2 16-bit int)
0
3 4 (2 16-bit int)
4 4 (2 16-bit int)
1 4 (2 16-bit int)
1 4 (2 16-bit int)
2 4 (2 16-bit int)
3 4 (2 16-bit int)
0
0
0
0
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