Grundfos CIU 501 Instructions

English (GB)
7
5. Modbus RTU, CIM 200 setup
Fig. 7 CIM 200 Modbus module
A screened, twisted-pair cable must be used. The cable screen
must be connected to protective earth at both ends.
Recommended connection
5.1 Setting the Modbus transmission speed
The transmission speed must be set correctly before the CIM 200
Modbus module is ready to communicate with the Modbus
network. DIP switches SW4 and SW5 are used for setting the
transmission speed. See fig. 8.
Fig. 8 Modbus transmission speed
DIP switch settings
Available transmission speeds in bits/s: 1200, 2400, 4800, 9600,
19200 and 38400.
The first three transmission speeds are only available via
software settings, whereas the last three are available via DIP
switches.
Default transmission speed is 19200 bits per second, as per the
Modbus RTU standard.
Software-defined
When SW4 and SW5 are set to "software-defined", writing a
value to the holding register at address 00004 will set a new
transmission speed.
Use the following values for software-defined transmission
speeds:
This value is set to 1200 bits/s as default.
The communication interface does not support transmission
speeds above 38400 bits/s.
The software-defined transmission speed value will be stored in
the communication interface and will remain after a power-off.
TM04 1697 0908
Pos. Designation Description
1D1
Modbus terminal D1
(positive data signal)
2D0
Modbus terminal D0
(negative data signal)
3 Common/GND
Modbus terminal
Common/GND
4SW1/SW2
On/off switches for termination
resistor
5 SW3/SW4/SW5
Switches for selection of Modbus
parity and transmission speed
6LED1
Red/green status LED for
Modbus communication
7LED2
Red/green status LED for
internal communication between
the CIM/CIU 200 and the
E-pump
8SW6
Hex switch for setting the
Modbus address (four most
significant bits)
9SW7
Hex switch for setting the
Modbus address (four least
significant bits)
Modbus terminal Colour code Data signal
D1-TXD1 Yellow Positive
D0-TXD0 Brown Negative
Common/GND Grey Common/GND
1 2 34 5 6 7
8
9
TM04 1710 0908
Transmission speed [bits/s] SW4 SW5
9600 OFF ON
19200 OFF OFF
38400 ON OFF
Software-defined ON ON
Software-defined transmission speed
Value to set in
register 00004
1200 bits/s 0
2400 bits/s 1
4800 bits/s 2
9600 bits/s 3
19200 bits/s 4
38400 bits/s 5
SW4 SW5

Grundfos CIU 501 Specifications

General

Brand	Grundfos
Model	CIU 501
Category	Controller
Language	English