This indicates that the depth is 74.45 feet, the probe temp is 76.4 F, the battery voltage
is 5.97, and the error code is 2 meaning that the battery voltage is below 6.5 volts.
SYSTEM STATE - A "?" command sent to the unit instructs the unit to send its current
operating state. This will include 3 lines of data. The first line reports the model number
and features, the software version, the unit serial number, and the user set ID number.
The second and third lines report the applicable system settings prefixed by the
commands used to set them as listed in the table in the section on external commands.
Example:
WW660 > ?
Mod #WW660-077303 Ver # 6601-008 Ser #080628015 ID #001
rn 25.0 rx 500.0 w 60.5 u0 a0 al 500.00 ah 25.00
nh 25.00 nl 500.00 cs0681n cm0681n RTU 11 cf0 6
WW660 >
In this example, "rn" indicates that the min range is 25.0, and the well temperature is
set to 60.5 degrees, etc.
MODBUS COMMUNICATIONS
The RS485 port on the Well Watch is configured to communicate as a slave device on
a two wire Modbus bus. When the RS485 Modbus port is enabled, the Well Watch
becomes a Modbus slave device listening for data requests from a Modbus master
device using either RTU or ASCII mode. Data requests with the address set in the Well
Watch will be processed and a data packet containing the requested data will be sent
back to the master.
The Well Watch can be configured for a Modbus network by pressing the SET button
repeatedly until the display reads RS485 Modbus. Then press the UP or DN button to
select the Modbus mode, either RTU or ASCII. Press the SET button again to show the
serial settings, the baud rate, number of data bits, stop bits and the parity. The flashing
number is selected and can be increased by pressing the UP button. The next number
can be selected by pressing the down button. Press the SET button once more to set
the address for the Well Watch. This can be any number from 1 to 243 which has not
been used by any other device on the network.
By default, the Well Watch is set to the most typical settings:
9600 baud, 8,1,even
Eno Scientific Well Watch 670
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