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Transmitter
13.4 Transmitter
13.4.1 HART and Modbus communication
13.4.1.1 HART communication
For devices with HART communication, the HART interface, along with the analog signal,
HART interface
is available at the output Iout1. A load resistance of 230 – 600 Ω at Iout1 is
recommended.
How to connect to the communication tools is described in the applicable Function
Manual (FM) A5E52748515.
13.4.1.2 Modbus communication
Modbus interface of SITRANS FC is implemented in accordance with "MODBUS over
Modbus interface
serial line specification and implementation guide V1.02", for details of instrumentation
see website of the Modbus organization (http://www.modbus.org/).
Modbus connections Tab. 35: Connection terminal assignment for Modbus
Terminal
I/O3 -
I/O4 +
I/O4 -
ROTAMASS
SITRANS FC
Fig. 68: MODBUS communication
3-Wire cable (twisted pair (D0, D1) and Common) with shield should be used. Wire gauge
Modbus cable
should be AWG24 or wider.
SITRANS FC has a RS485 electrical interface, operating in slave mode and
communicating with the following default specification:
▪ Modbus baud rate: 19200 bps
Default Modbus
setting
▪ Modbus transfer mode: RTU
▪ Modbus parity: Even
▪ Modbus stop bit: 1 stop bit
For further details, see applicable Function Manual (FM) A5E52748619.
MODBUS_B
IO4+
MODBUS_A
IO4-
MODBUS_C
IO3-
Description
Modbus C (Common)
Modbus B (D1)
Modbus A (D0)
RD+
RS485
RD-
Modem
GND
A5E52748387-AA, 2023/09
FC7x0
Wiring
113 / 180
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