HYDROCAL 1001+ Installation and operation manual Page 68/76
4.6.1.4. MODBUS ASCII
The connection of multiple HYDROCAL units to a SCADA system can be performed via MODBUS
®
serial. On this HYDROCAL unit MODBUS
®
serial communication is possible via RS485 interface.
The MODBUS
®
ASCII settings for the serial interface have to be entered in the following menu:
Mode: ASCII Mode
Address: 1 ... 247
Answer Delay: 50 ms
Serial Setup: 19200 (2400 ... 115200) Bauderate
7 (7 ... 8) Data Bits
N (None / Odd / Even) Paritiy
1 (1 ... 2) Stop Bits
Note: A unique address (1...247) has to be entered for each unit in the RS485 bus. Actually up to 32
units can be present in the same RS485 bus. Change of the transmission mode does not set the cod-
ing format parameters to the default values for the selected mode (RTU: 19200-8-E-1; ASCII: 19200-
7-E-1). The right configuration has to be performed manually.
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