Communications Options User’s Guide
13
Chapter 1. Modbus Communications
1.4.2
Notes for a Liquid Flowmeter:
1.
Clear Totalizers:
Write 1 to Reg 1 to clear Channel 1 and Channel 2 totalizers.
2.
Error Value:
see table in DF868 manual for error codes
3.
Average:
average of channel 1 and channel 2 if both channels out of error,
channel 1 value if channel 2 is in error,
channel 2 value if channel 1 is in error,
zero if both channels are in error.
4.
Average Error Status:
0 = both in error
1 = chan 2 in error,
2 = chan 1 in error,
3 = both ok
5.
MODBUS baud rate:
5 = 2400, 6 = 4800, 7 = 9600
6.
MODBUS parity:
0 = none, 1 = odd, 2 = even
7.
MODBUS stop bits:
1 = 1 stop bit, 2 = 2 stop bits
8.
General:
Registers are written if corresponding functions are actuated by the user. Registers for unactuated functions are
initialized to zero at startup.
9.
Error Code:
Highest number (single or combination of errors) listed, without an “E”. Error codes should be explained in the
user’s manual.
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