Bühler technologies RC 1.2 Rack Kurzanleitung Seite 19

RC 1.2 Rack, RC 1.2+ Rack
5.3 Description of menu functions
5.4 Using the Digital Interface
The digital interface on this device is a Modbus RTU protocol,
which physically communicates via RS485 (2-wire). The cooler
therefore takes on the role of the slave in communication.
The Modbus interface enables direct access to process and
diagnostic data and parameters during operation.
5.5 Modbus Configuration
The settings listed below correspond to the default settings;
with the interface active, the parameters can be adjusted.
Structure of a character:
1 start bit
8 data bits
1 parity bits (configurable)
1 stop bit (*)
Baudrate: 19200 bps (configurable)
Device ID: 10 (configurable)
(*) The length of a character is always 11 bits. If the interface is
configured with 0 parity bits, the number of stop bits auto-
matically changes to 2.
5.6 Modbus Communication
Communication via Modbus RTU is always imitated by the
master (request). The slave (typically) responds to the request
with a response. A Modbus RTU frame for a request/response
always has the following structure:
Address field Function code
(A) (FC)
1 byte 1 byte
Register addresses and data are transferred in Big Endian
format.
Every register stands for a 16 bit value, with the information
represented in various data types. The data type and required
function code are assigned to the respective registers in the
following tables.
To read/write data types with sizes larger than an individual
register, multiple registers must be addressed.
Supported function codes:
Function code (FC)
Read Holding Registers
Write Multiple Registers
Data types:
Description Number of bytes
Float 4
Int16 2
Uint16 2
Int32 4
Uint32 4
BX450040 ◦ 07/2025
Data CRC
1 ... 252 bytes 2 bytes
FC values
3
16
Number of registers
2
1
1
2
2
6 Maintenance
Always observe the applicable safety and operating regula-
tions when performing any type of maintenance. For informa-
tion about maintenance, please refer to the original operating
instructions. Scan the QR code on your device. Here you will
find all relevant and specific information about your product.
7 Service and Repair
For a detailed description of the device and information about
troubleshooting and repair, please refer to the full operating
instructions. Scan the QR code on your device. Here you will
find all relevant and specific information about your product.
8 Disposal
The refrigerant circuit of the cooler contains R134a refrigerant.
The heat exchanger is charged with glycol-based coolant.
The applicable national laws must be observed when dispos-
ing of the products. Disposal must not result in a danger to
health and environment.
The crossed out wheelie bin symbol on Bühler Technolo-
gies GmbH electrical and electronic products indicates special
disposal notices within the European Union (EU).
The crossed out wheelie bin symbol indicates
the electric and electronic products bearing
the symbol must be disposed of separate
from household waste. They must be properly
disposed of as waste electrical and electronic
equipment.
Bühler Technologies GmbH will gladly dis-
pose of your device bearing this mark. Please
send your device to the address below for this
purpose.
We are obligated by law to protect our employees from haz-
ards posed by contaminated devices. Therefore please under-
stand that we can only dispose of your waste equipment if the
device is free from any aggressive, corrosive or other operat-
ing fluids dangerous to health or environment. Please com-
plete the "RMA Form and Decontamination Statement", avail-
able on our website, for every waste electrical and electronic
equipment. The form must be applied to the packaging so it is
visible from the outside.
Please return waste electrical and electronic equipment to the
following address:
Bühler Technologies GmbH
WEEE
Harkortstr. 29
40880 Ratingen
Germany
Please also observe data protection regulations and remem-
ber you are personally responsible for the returned waste
equipment not bearing any personal data. Therefore please
be sure to delete your personal data before returning your
waste equipment.
Bühler Technologies GmbH 19