Grundfos CIU 202, Functional Profile And User Manual

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English (GB)
8
5. CIM 200 Modbus RTU setup
Fig. 4
CIM 200 Modbus module
Use a screened, twisted-pair cable. Connect the cable screen to
protective earth at both ends.
Recommended connection
5.1 Setting the Modbus transmission speed
Set the transmission speed correctly before the CIM 200 Modbus
module is ready to communicate with the Modbus network. Use
DIP switches SW4 and SW5to set the transmission speed. See
fig.
5 .
Fig. 5
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 sets 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 is stored in the
communication interface and remains after a power-off.
TM
04
16
97
09
08
Pos. Designation Description
1 D1
Modbus terminal D1 (positive
data signal)
2 D0
Modbus terminal D0 (negative
data signal)
3 Common/GND
Modbus terminal, Common and
GND
4 SW1/SW2
On and off switches for
termination resistor
5 SW3/SW4/SW5
Switches for selection of Modbus
parity and transmission speed
6 LED1
Red and green status LED for
Modbus communication
7 LED2
Red and green status LED for
internal communication between
CIM 200 and the CIU 202 unit.
8 SW6
Hexadecimal rotary switch for
setting the Modbus address (four
most significant bits)
9 SW7
Hexadecimal rotary 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 3 4 5 6 7
8
9
TM
04
17
10
09
08
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
When software-defined transmission speed is
enabled (ON), software-defined parity, stop bits and
address setting are also enabled.
SW4 SW5