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12
Interface
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In
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rf
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Chapter
12
12-1.
RS-485 Interface
(RS-485 or SI/F
standard: not specified at the time of order)
RS-485 is an interface to read the indicated values and status of the F325 and to write the setting
values into the F325. This interface is convenient for processing such as controls, totals, and
records by connecting the F325 to a PLC, programmable display unit and so forth.
■
Communication specifications
Specifications
Message format:
Modbus-RTU, UNI-Format
Signal level:
Based on RS-485 Two-wire
Transmitting distance:
Approx. 1 km
Transmitting method:
Asynchronous, half duplex
Transmitting speed:
Selectable from 1200, 2400, 4800, 9600, 19200, 38400 bps
Number of connectible units: Maximum 32 (including one master unit)
Bit configuration:
Start bit
1bit
Character lengt Selectable from 7 or 8 bit
(8 bit for Modbus-RTU)
Stop bit
Selectable from 1 or 2 bit
Parity bit
Selectable from none, odd or even
Terminator
Selectable from CR, CR-LF
Code:
Binary (for Modbus-RTU)
ASCII (for UNI-Format)
12
Interface
B8
B9
B10
RS-485 terminal
B+
A-
SG
RS-485 signal ground terminal
