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SIT SITRANS RD300RANS RD300
Page 78
SITRANS RD300 – OPERATING INSTRUCTIONS
A5E31917845
Modbus RTU Serial Communications (
serial
)
The meter is equipped with serial communications capability as a
standard feature using Modbus RTU Serial Communication Protocol.
To communicate with a computer or other data terminal equipment, an
RS-232, RS-485, or USB adapter (7ML19306AJ) option is required.
WARNING: Do not connect any equipment other
than Siemens’s expansion modules, cables, or
meters to the RJ45 M-LINK connector. Otherwise
damage will occur to the equipment and the meter.
Note: More detailed instructions are provided with each optional
serial communications adapter.
Note: Refer to the SITRANS
RD300 Modbus Register Tables
located at www.siemens.com for details.
When using more than one meter in a multi-drop mode, each meter
must be provided with its own unique address. The meter address
(Slave ID) may be programmed between 1 and 247. The transmit delay
may be set between 0 and 199 ms. The parity can be set to even, odd,
or none with 1 or 2 stop bits.