HYDROCAL 1005 Manual for Installation and Operation Page 73/111
III. MODBUS/RTU via RS485 (using QuickMod)
This test of HYDROCALMODBUS/RTU via RS485 was executed using the QuickMod application
and the Roline RS2327RS485 adapter (12.02.1028). Connection, setup and results are shown be-
low.
Physical Connection
The RS232-to-RS485 adapter is configured for 2-wire (referred to as MultiDrop Half Duplex in the
adapter manual). The terminals pairs T+, R+ and T-, R- are short connected (terminal block con-
nectors 1+4, 2+3).
The RS232-to-RS485 adapter is configured to use RTS send / receive control (SW2 in middle po-
sition to TxRTS/RxRTS, with the underlined text indicating that the signal in not active).
HYDROCAL and QuickMod Connection Setup:
HYDROCAL is set up with an answer delay of 100 ms to give enough time for QuickMod to toggle
the RS232-to-RS485 adapter from send to receive.
In the QuickMod configuration dialog, setting RTS Control to Toggle will operate the RS232-to-
RS485 adapter in the desired way.
HYDROCAL and QuickMod Data Screens Dumps
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