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8017171/115Z/V3-0/2019-01/ SICK OPERATING INSTRUCTIONS | VISIC100SF
Subject to change without notice
INSTALLATION
3.7.2 Bus connections
There is the option to output the VIS, CO and NO (or NO
2
) value digitally via Modbus-RTU
(standard) or PROFIBUS DP-V0 (optional). Bus connections require low wiring effort.
3.7.3 Modbus-RTU (integrated in the VISIC100SF standard version)
The Modbus-RTU interface allows the user to read out the VISIC100SF measured values
and status information using the two function codes “Read Holding Register (0x03)” and
“Read Coil (0x01)”.
Modbus-RTU interface configuration options
The Modbus-RTU interface can only be configured using the device display. The following
parameters can be changed here:
● Modbus-RTU ID (0 to 247), see Section “Menu”, see “Setting bus parameters”, page 57
● Parity, see Section “Menu”, see “Setting the Modbus data transfer format with menu
item “MB Par””, page 58.
● Baud rate, see Section “Menu”, see “Setting the Modbus baud rate with menu item “MB
BdR””, page 59.
3.7.3.1 Modbus-RTU data format
3.7.3.2 Modbus-RTU baud rates
● 4.8 k
● 9.6 k
● 19.2 k
● 38.4 k
● 57.6 k
The protocol (Modbus-RTU/ TAD control unit) can be set on the RS-485 interface using
the device display. See Section “Menu”, see “Setting the RS-485 interface with sub-
menu item “Bus””, page 56.
The VISIC100SF must be restarted to save parameter changes.
Press “Reset” to restart, see “Measuring unit - circuit board with display and keypad”,
page 17.
Parity
● Even parity, 1 stop bit
● Odd parity, 1 stop bit
● No parity, 1 stop bit
● No parity, 2 stop bits
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