Flintec FT-112 - RS485 Serial Port

FT-112(D) Panel Weighing Indicator, Technical Manual, Rev.1.0.0, May 2019 Page 22 of 170
4.6.4 RS485 Serial Port
The use of this galvanically isolated serial port and its specifications are described in the Table 4-5 and its pin
configuration is shown in Table 4-6. Refer to page 45 to configure RS485 serial port and page 106 for details
on data formats.
Remember 120 ohm line termination resistors should be installed both ends of the RS485 line.
Usage
Interfacing with Printer, PC, PLC, remote display etc.
Data formats
Continuous, Fast Continuous, Printer, BSI Protocol or Modbus RTU
Baud rate
1200 / 2400 / 4800 / 9600 (Default) / 19200 / 38400 / 57600 bps
Length
7 or 8 (default) bits
Parity
Even, Odd or No (default)
Start / Stop bits
1 start bit and 1 stop bit
Address
Programmable between 01 …. 99
Max quantity
Maximum 31 instruments on the line.
Cable length
Maximum 1000m.
Table 4-5 - RS485 Serial Interface Specifications
Definition
RS485
Pin number
A+
4
B-
5
Under the terminal
Table 4-6 – Pin configuration of RS485 terminal
RS485 serial connection is done with two wires as indicated below in Figure 4.9.
1 2 3 ……………… 31
Figure 4.9 – Multi instrument connection with PLC
1
9