7
3.2 LEDs
The CIM 250 GSM module has two LEDs.
See fig.
.
• Yellow/green status LED (LED1) for GSM/GPRS communication
• Red/green status LED (LED2) for internal communication between the CIU 250 and the MP 204.
LED1 (yellow/green)
Fig. 6
LED1 status
LED2 (red/green)
4.
Modbus function code overview
The supported function codes are shown in the table below:
The same data are available in both holding registers and input registers, meaning that either function (0x03 or 0x04) can be used for
reading data.
Examples illustrating the use of the supported function codes can be found in section
11. Modbus telegrams and function codes
.
Modbus telegram examples illustrating the use of the functional profile can be found in section
.
TM
04
51
94
28
09
Searching for GSM network
Call-up connection active
Data via GPRS
Data via call-up connection
SMS message
1 sec.
3 sec.
1
6
4
5
3
2
Yellow
Green
GSM network active
Pos.
Status
Description
1
Flashing yellow.
Searching for GSM network.
2
Pulsating yellow (single pulse).
Connection to the GSM network has been established.
3
Constantly yellow.
Call-up connection has been established.
4
Pulsating green (single pulse).
Data are exchanged via GPRS.
5
Pulsating green (double pulse).
Data are exchanged via the call-up connection.
6
Green (3 sec.).
Sending or receiving an SMS message.
Status
Description
Off.
The CIU 250 has been switched off.
Flashing red.
No communication between the CIU 250 and the MP 204.
Constantly red.
The CIU 250 does not support the connected version of the MP 204.
Constantly green.
The connection between the CIU 250 and the MP 204 is OK.
Note
The CIU 250 must have finished its start-up sequence before the LED2 can be used for status. This means that a
certain delay may occur before the LED2 turns green after start-up of the CIU 250.
Type
Code
Hex
Name
16-bit data (registers)
03
0x03
Read holding registers
04
0x04
Read input registers
06
0x06
Write single register
16
0x10
Write multiple registers
Diagnostics
08
08
Diagnostics
See section
for subcodes.
Note
Reading or writing coils are not supported.
