Setting The Modbus Transmission Speed; Leds - Grundfos CIM 2 Series Installation And Operating Instructions Manual

3.5 Setting the Modbus transmission speed

The transmission speed must be set correctly before
the CIM 2XX Modbus module is ready to
communicate with the Modbus network. See fig. 7.
SW4 SW5
Fig. 7 Modbus transmission speed
DIP switch settings
Transmission speed
[bits/s]
9600
19200
38400
Software-defined
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:
Software-defined
transmission speed
1200 bits/s
2400 bits/s
4800 bits/s
9600 bits/s
19200 bits/s
38400 bits/s
When software-defined transmission
Note
speed is enabled (ON), software-defined
parity and stop bit are also enabled.
6
SW4 SW5
OFF ON
OFF OFF
ON OFF
ON ON
Set register value
00004
0
1
2
3
4
5

4. LEDs

The CIM 2XX Modbus module has two LEDs.
See fig. 1.
• Red/green status LED (LED1) for Modbus
communication
• Red/green status LED (LED2) for internal
communication between the CIM 2XX and
the Grundfos product.
LED1
Status Description
Off. No Modbus communication.
Flashing green. Modbus communication active.
Fault in the Modbus
Flashing red.
communication.
Permanently Fault in the CIM 2XX Modbus
red. configuration.
LED2
Status Description
The CIM 2XX has been switched
Off.
off.
No internal communication
Flashing red. between the CIM 2XX and
the Grundfos product.
Permanently The CIM 2XX does not support
red. the Grundfos product connected.
Internal communication between
Permanently
the CIM 2XX and the Grundfos
green.
product is OK.
During start-up, there may be a delay of up
Note
to 5 seconds before the LED2 status is
updated.