Common Configuration
For both meter types, there are some downlink messages that are common. Those are:
1. Open Configuration downlinks – to open the device to receive any configuration.
2. Set Number of Parameters – to set how many parameters can be transmitted in one uplink message.
3. Time interval – to set how often the device transmits the data.
It’s worth mentioning that all the downlinks need to be queued in order, one at a time and to fport 1.
Open Configuration
There are 3 downlink messages that need to be queued to enable configuration on the device. Once the downlinks are received by the device, there is a 30-minute window where the configuration can be changed. After that time, the downlinks will need to be re-sent.
The downlink messages are always the same and will replicate those listed below.
010300180002440C
01100018000204447A0000C62C
0103000E0002A5C8
Number of parameters per uplink message
Then there is the downlink to set the number of parameters per 1 uplink message.
It’s recommended to set this to 5, but it can be adjusted to suit your needs.
The downlink message that sets the number of parameters to 5 is:
0110FE1200010200057AEE
Time Interval
The time interval downlink message changes how often the device transmits data. It’s recommended to keep this setting to 30 minutes for the most reliable transmission.
It is possible to set this to send data more frequently but with a higher data transmission rate there is a chance that some packets will be missed. This could become a problem, especially in some cases where there are a lot of parameters being measured, hence the 30-minute time interval is a sweet spot.
The Downlink message to set the time interval to 30 minutes is:
0110FE01000102001E3846
A time interval change downlink message can be sent to the device at the initial configuration stage or at a later date. In order to change just the time interval, you will need to send Open Configuration messages first.
SDM-230 example of payload parameters and data structure
The Single-Phase Eastron energy meter can measure a lot of parameters. It is recommended to choose up to 10 parameters based on the list below. Choosing more than 10 may end up in data not being transmitted correctly or in data packet loss.
Example #01
Let’s say, we are interested in measuring the Voltage, Frequency and Current.
To do so, based on the list of parameters above, we will need to choose 00, 01, 02.
We also need to set the Number of Parameters to 3 in this case.
The downlink message itself for the 3 selected parameters will then look like this:
0110FE02000F1E000102FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF4FA8
Where:
01 – slave address
10 – function code
FE02 – address this setting is being sent to
000F – number of registers, 15
1E – number of bytes, 30 (2 bytes per register)
000102FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF – the 30 bytes of parameters, we have turned on 00, 01 & 02, all others are off (ff)
4FA8 – MODBUS CRC
To send the whole configuration we need to send the Open Configuration downlinks, Number of Parameters downlink, time interval downlink (optional), and the configuration downlink. That will result in 5 (or 6 if we selected time interval change) downlink messages to be sent one by one and one at a time to fport 1.
The downlinks in this particular example will be:
010300180002440C (open config)
01100018000204447A0000C62C (open config)
0103000E0002A5C8 (open config)
0110FE120001020003FAEC (number of parameters set to 3)
0110FE01000102001E3846 (optional 30mins time interval)
0110FE02000F1E000102FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF4FA8 (configuration)
SDM-630 example of payload parameters and data structure
Similarly like in a single-phase meter, the Three-Phase Eastron energy meter can measure a lot of parameters. It is recommended to choose up to 10 parameters based on the list below. Choosing more than 10 may end up in data not being transmitted correctly or in data packet loss. The list of parameters differs from the single-phase one so be sure to select from the correct list when deciding on which parameters you want to select.
Example #02
Let’s say we are interested in measuring Voltage L1-N,L2-N,L3-N, Current L1, L2, L3, Active Power L1, L2, L3
To enable those parameters in configuration we need to select the following: 00 01 02 07 08 09 10 11 12
The downlink message itself for selected 9 parameters will then look like this:
0110FE02000F1E000102070809101112FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFA008
Where:
Where:
01 – slave address
10 – function code
FE02 – address this setting is being sent to
000F – number of registers, 15
1E – number of bytes, 30 (2 bytes per register)
000102070809101112FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF – the 30 bytes of parameters, we have turned on 00, 01, 02, 07, 08, 09, 10, 11, 12 all others are off (FF)
A008 – MODBUS CRC
To send the whole configuration we need to send the Open Configuration downlinks, Number of Parameters downlink, time interval downlink (optional), and the configuration downlink. That will result in 5 (or 6 if we selected time interval change) downlink messages to be sent one by one and one at a time to fport 1.
Those downlinks in this particular example will be:
010300180002440C (open config)
01100018000204447A0000C62C (open config)
0103000E0002A5C8 (open config)
0110FE1200010200057AEE (number of parameters set to 5)
0110FE01000102001E3846 (optional 30mins time interval)
0110FE02000F1E000102070809101112FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFA008 (configuration)
You would expect 2 messages with 5 values each (because there are 9 parameters, the second message will contain only 4 valid values.)
Those messages will contain data as follows:
[“L1-N Voltage”,”L2-N Voltage”,”L3-N Voltage”,”L1 Current”,”L2 Current”],
[“L3 Current”,”L1 Active Power”,”L2 Active Power”,”L3 Active Power”,”N/A”]
To find out more about the Eastron Meter or for assistance in configuring your IoT devices, please contact our expert team today.
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