Precision Digital PD865 - Manual (Page 83)

PD865 Modbus Snooper Serial Input Meter Instruction Manual
83
Table 5. 4-20mA Output Modes
For the Serial Communications sources: Register 40313 holds the
data, either as
μA (0 to 23999 Ξ 0.000 to 23.999 mA) or DAC bits (0
to 65535). The DAC (Digital to Analog Converter) used for the 4-20
mA generation is updated whenever data is written to Register
40313.
For any of the Display value sources: The DAC is updated when the
Display value is updated.
The actual 4-20 mA range is limited due to component tolerances,
but is guaranteed by design to be at least from 1.000 to 23.000 mA.
Bit(s) 15 – 3 2 – 0
Description 0 – 0 4-20 mA Data Source
0 = Display value
1 = Max Display value
2 = Min Display value
3 = Serial Communications: mA.
4 = Serial Communications: bits.
5 to 7 = Unused.
Table 6. Mode Selection (40011)
Bit(s)
7 6 – 4 3 2 1 – 0
Description
5 or 6
Digit
Register
0 – 0
Function
Code
0 Mode
0 = 5 digit
(x0001
x9999)
1 = 6 digit
(x00001
x65536)
0 = 03
1 = 04
(Master/
Snooper)
0 = Master
1 = Slave
2 = Snooper
3 = Defaults to
Master