(3) PVDU time unit selection: in time interval measurement function F10 / F11 / F12, select time
unit. When PVDU is set to OFF, the ratio factor A and B are set to 1, and the display units are
seconds. The ratio factor A and B can be displayed as other units.
(4) The ratios of A, D ratio factor (multiplication), B and E ratio (except): A B B and D E E are
used as ratios. For example, set A = 215, B = 1000, that is, the ratio is 0.215
(5) When setting the decimal point position parameter, push the decimal point shift right, push
the decimal point moves to the left.
(6) When there is a sharp change in the measured value and the measured value shows digital jump
repeatedly or caused by interference, the digital filter coefficient should be increased to make
the display stable. The larger the digital filter is, the more stable the measured value is, but the
slower the response is.
(7) The output test function can use keys to change the test value, and can confirm the output action
without the actual input signal. Push to reduce test values, push to increase the value.
(8) The instrument can be equipped with RS-485 or RS-232C communication interface with
photoelectric isolation, using Modbus RTU communication protocol, and the baud rate is 2400-
38400 bps. When using the RS - 485 interface, each host can directly connect 63 meters at
most.
The host can read the working state of the meter and send commands such as RST and HOLD.
The host can read parameter values and read 1 or more parameter values at a time.
The host can write parameter values and write 1 or more parameter values at a time.
Each parameter has EEPROM address and RAM address at the same time. Due to the limited
number of write times of EEPROM (about 100,000 times), it is recommended that the
parameters with excessive replacement frequency be written into RAM without the limit of
write times, but when power on again, the instrument uses the data in EEPROM.
When the communication mode parameter COMM is set to OFF, the communication function
of the instrument is closed; when RO is set, only the parameters and working status of the
instrument can be read, and the parameters can not be modified; when R-W is set, both the
parameters and working status of the instrument can be read and the parameters can be
modified.
"GW621/GW626/GW631/GW636 Multifunctional Pulse Meter Communication Instructions"
contains detailed communication instructions.
Download address: http://www.khae.cn/support/manual/pgw620.pdf
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