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+--- Thread: Modbus Gateway Schneider Electric Em3155 (/showthread.php?tid=29)
Modbus Gateway Schneider Electric Em3155 - PassivPluss - 09.07.2015
Hi.
I cannot get the modbus to work correctly to communicate with iEM3155 on Modbus, parameters inserted correctly but there is no place to choose stop bits in LM, the iEM has 1 stop bit. Is that OK?
I tried to modify the Json file to the correct settings for reading adresses but i only get 0 value. I tried one up and one down register also. Any ideas?
i can also add that the iEm3155s Communication LED blinks when trying to read registers.
RE: Modbus Gateway Schneider Electric Em3155 - admin - 10.07.2015
Stop bit settings are merged with parity in order to prevent invalid values, you can choose from:
- None (1 stop bit)
- Odd (1 stop bit)
- Even (1 stop bit)
- None (2 stop bits)
If you have a valid device profile you can use scan feature to discover your device. If scan works properly it means that settings are correct and reading should work as well.
RE: Modbus Gateway Schneider Electric Em3155 - PassivPluss - 10.07.2015
Of course. But I still get no communication.
Ii example i want to read the following register from the manuafactors table:
Register
Address
Action
(R/W/WC) Size Type Units Description
Current
3000 R 2 Float32 A I1: phase 1 current
3002 R 2 Float32 A I2: phase 2 current
3004 R 2 Float32 A I3: phase 3 current
3010 R 2 Float32 A Current Avg
Voltage
3020 R 2 Float32 V Voltage L1–L2
3022 R 2 Float32 V Voltage L2–L3
3024 R 2 Float32 V Voltage L3–L1
3026 R 2 Float32 V Voltage L–L Avg
3028 R 2 Float32 V Voltage L1–N
3030 R 2 Float32 V Voltage L2–N
3032 R 2 Float32 V Voltage L3–N
3036 R 2 Float32 V Voltage L–N Avg
I then made the json file:
{
"manufacturer": "Passiv Pluss",
"description": "Strømmåling",
"mapping": [
{ "name": "Gjennomsnitt A", "bus_datatype": "float32", "type": "inputregister", "address": 3010 }
]
}
I also tried register instead of inputregister. I want to use the modbus function 3 for reading and 16 for writing to registers as noted under.
Modbus parameters from IEM3155
Function list
The table below lists the supported Modbus functions:
For example:
• To read different parameters from the meter, use function 3 (Read).
• To change the tariff, use function 16 (Write) to send a command to the meter.
Table format
Decimal Hexadecimal
3 0x03 Read Holding Registers
16 0x10 Write Multiple Registers
43/14 0x2B/0x0E Read Device Identification
Type Description Range
UInt16 16 bit unsigned integer 0 – 65535
Int16 16 bit signed integer -32768 to +32767
UInt32 32 bit unsigned integer 0 – 4 294 967 295
Int64 64 bit unsigned integer 0 – 18 446 744 073 709 551 615
UTF8 8 bit field multibyte character encoding for Unicode
Float32 32 bit value Standard representation IEEE for floating number (with single
precision)
iEM 3155 instructions for downloading
RE: Modbus Gateway Schneider Electric Em3155 - edgars - 15.07.2015
The best way to integrate this Modbus device is by using a profile file, this will exclude all possible scripting mistakes.