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SUNNY WEBBOX RPC
User Manual
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SMA SUNNY WEBBOX RPC User Manual

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EN
Remote Procedure Call Description Interfaces and API Definition
Plant Monitoring
SUNNY WEBBOX RPC
User Manual
SWebBoxRPC-BA-en-14 | Version 1.4
SMA Solar Technology AG 1 Introduction

1 Introduction

1.1 Validity

This document applies to the RPC interface of the Sunny WebBox and the Sunny WebBox with
Bluetooth

1.2 Nomenclature

In this document, the Sunny WebBox with Bluetooth® Wireless Technology is referred to as Sunny WebBox with Bluetooth.

1.3 Acronyms and Abbreviations

API Application Programmers Interface
HTTP Hypertext Transfer Protocol
JSON Javascript Object Notation
UDP User Data Protocol
URL Uniform Resource Locator
RAS Remote Access Service
RFC Request for Comment
RPC Remote Procedure Call
®
Wireless Technology.

1.4 Referenced Documents and Sources

[1] RFC 4627: The application/json Media Type for Javascript Object Notation (JSON) http://www.ietf.org/rfc/rfc4627.txt?number=4627
[2] JSON-RPC 1.1 Working Draft August 2006 http://json-rpc.org/wd/JSON-RPC-1-1-WD-20060807.html
[3] Introducing JSON http://www.json.org
[4] The MD5 Message-Digest Algorithm http://www.ietf.org/rfc/rfc1321.txt?number=1321
User Manual SWebBoxRPC-BA-en-14 5
2 System Overview SMA Solar Technology AG

2 System Overview

2.1 Sunny WebBox RPC

The da ta loggers Sunny Web Box and Sunny WebBox with Bluetooth contin uous ly r eco rd a ll th e da ta of a PV plant. This is then averaged over a configurable interval and cached. The data can be transmitted at regular intervals to the Sunny Portal for analysis and visualization.
Via the Sunny WebBox and Sunny WebBox with Bluetooth RPC interface, selected data from the PV plant can be transmitted to a remote terminal by means of an RPC protocol (Remote Procedure Call protocol).
To do this, the Sunny WebBox provides a pool of service procedures (see Section6 "Object Definitions", page12) that can be accessed from the remote terminal by means of a Remote Procedure Call protocol (RPC protocol) via a network or RAS connection. The data exchange format used here is the JavaScript Object Notation (JSON) (see Section3 "JavaScript Object Notation", page7).
2.2 Differences between Sunny WebBox and Sunny WebBox with
Bluetooth
Different representation for Sunny WebBox and Sunny WebBox with Bluetooth
The presentation of the plant data transmitted via the RPC interface is different for the Sunny WebBox and the Sunny WebBox with Bluetooth.
This document only contains sample responses for the Sunny WebBox and none from the Sunny WebBox with Bluetooth.
You will find a list of measured values and parameters for the Sunny WebBox with Bluetooth in the technical description "Measured Values and Parameters" at www.SMA-Solar.com.
Available service procedures Sunny WebBox Sunny WebBox with
Bluetooth
RPC_GET_PLANT_OVERVIEW + +
RPC_GET_DEVICES + +
RPC_GET_PROCESS_DATA_CHANNELS + +
RPC_GET_PROCESS_DATA + +
RPC_GET_PARAMETER_CHANNELS + –
RPC_GET_PARAMETER + –
RPC_SET_PARAMETER + –
6 SWebBoxRPC-BA-en-14 User Manual
SMA Solar Technology AG 3 JavaScript Object Notation

3 JavaScript Object Notation

A description and explanation of JavaScript Object Notation (JSON) can be found on the website http://www.json.org.

3.1 Example

The f oll owing example shows an illustr ation of a device list. It defines an object made up of the values "totalDevicesReturned" and "devices".
"totalDevicesReturned" is a figure with the value 4. The array "device" has 2 fields, each having one device object objects.
RPC={
"totalDevicesReturned":4,
"devices":
[
{
"key":"SCC250H9:1390148531",
"name":"Sunny Central E1",
"children":
[
{
"key":"SCBFS016:8945",
"name":"Sunny BFS E1",
"children":null
},
{
"key":"SMU8b004:2567",
"name":"String Monitoring Unit E1",
"children":null
}
]
},
{
"key":"SCC250H9:1390148538",
"name":"Sunny Central E2",
"children":
(see Section6.1 "Device Object", page12), which in turn contains nested device
User Manual SWebBoxRPC-BA-en-14 7
3 JavaScript Object Notation SMA Solar Technology AG
[
{
"key":"SCBFS016:8956",
"name":"Sunny BFS E2",
"children":null
},
{
"key":"SMU8b004:2534",
"name":"String Monitoring Unit E2",
"children":null
}
]
}
]
}
8 SWebBoxRPC-BA-en-14 User Manual
SMA Solar Technology AG 4 Procedure Conventions

4 Procedure Conventions

All identifiers used are case-sensitive. This means that "Power" and "power", for instance, designate two different objects. All characters are transmitted using Unicode in UTF-8 format.

4.1 Procedure Call (Request)

Each request consists of one serialized JSON object which possesses the following obligatory members:
• version — a character sequence which defines the underlying RPC version.
• proc — a character sequence which contains the procedure to be called.
• id — a random character sequence (max. 16 characters) which serves to assign a response to
the request.
• format — a character sequence defining the data exchange format of the procedure's result
(see Section4.2 "Return Value (Response)", page10).
• passwd — a character sequence comprising the hash value of the password for the desired
access level (user, installer). The hash value is calculated using the MD5 algorithm (see [4]). Password allocation is performed via the security settings in the Sunny WebBox. If the object is not transmitted, the user level is automatically assumed.
• params — an object whose elements are transferred to the procedure as arguments. Each
parameter must be available in the form of a named JSON object. Hence, the sequence is arbitrary. The number of parameters depends on the given service procedure (see Section 7). If the requested procedure does not expect any arguments, the entry is omitted.
User Manual SWebBoxRPC-BA-en-14 9
4 Procedure Conventions SMA Solar Technology AG

4.2 Return Value (Response)

The data exchange format of the response is defined by the character sequence transmitted in the request.
The following formats are currently available:
•JSON

4.2.1 JSON

The response to a request consists of a serialized JSON object made up of the following compulsory objects:
• version — a character sequence which defines the underlying RPC version.
• proc — a character sequence which contains the called procedure.
• id — a character sequence which serves to assign the request and response. Contains the ID
from the respective request.
• result — the result of the executed procedure as a serialized JSON object. If d ue t o an err or the
procedure cannot be executed successfully, the "error" object will be transmitted instead.
• error — an object containing a character string with a description of the error encountered. If
the procedure is executed without errors, this object will not be transmitted.

4.3 Query Interval

The interval between two queries should not be less than 30 seconds.
10 SWebBoxRPC-BA-en-14 User Manual
SMA Solar Technology AG 5 Interfaces

5 Interfaces

The Sunny WebBox provides two different access options which differ in the implementation effort required and their runtime utilization

5.1 RPC via UDP Stream

The procedure call is transmitted to port 34268 of the Sunny WebBox in the usable data part of the UDP protocol. Responses are also sent to port 34268.
UDP transport requires a relatively low implementation effort on the client side and saves runtime resources. For communication beyond the limits of local networks, the port will normally need to be opened by the appropriate firewalls.

5.2 RPC via HTTP

Data exchange takes place by means of the Hypertext Transfer Protocol via a TCP/IP connection to the web server port configured in the Sunny WebBox.
The default setting is port 80.
The URL for all requests is: http://IP address/rpc
The IP address in each case is the currently configured IP address of the Sunny WebBox. The default setting is 192.168.0.168.
Hence, the default URL is the following: http://192.168.0.168/rpc
The request is transmitted via HTTP POST in the body of the HTTP request as a serialized JSON object according to the conventions established in Section 4.1.
Both the client-side implementation effort and the resource requirements are relatively high. As a general rule, communication takes place via the standard port 80, which means that there is no need to make any changes to active firewalls.
of resources.
User Manual SWebBoxRPC-BA-en-14 11
6 Object Definitions SMA Solar Technology AG

6 Object Definitions

This section defines the structure of frequently used objects using the JSON syntax. In the description, the values of the object members define the type of data used. All definitions apply accordingly to all other data transmission formats.

6.1 Device Object

Describes a device within the plant (e.g. Sunny Boy, Sunny Sensor Box).
RPC={
"key": "string",
"name": "string" or null (optional),
"channels": [array] or null (optional),
"children": [array] or null (optional)
}
key: A unique device key (e.g. "SB21TL06:2000106925").
name: The user-definable name of the device (e.g. "INV left"). Defining this element is optional.
If the element is used but no name was defined, "null" is entered.
channels: An array of channel objects of the device. Defining this el eme nt is opt ion al. If t he eleme nt
is used but no channels exist, "null" is entered.
children: An array of objects containing sub-devices. Defining this element is optional. If the
element is used but no sub-devices exist, "null" is entered.
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SMA Solar Technology AG 6 Object Definitions

6.2 Channel Object

Describes a process data or parameter channel of a device.
RPC={
"meta": "string",
"name": "string" (optional),
"value": "string",
"unit": "string" (optional),
"min": "string" (optional),
"max": "string" (optional),
"options": [array] (optional)
}
meta: The meta name which uniquely defines the channel (e.g. "ExtSolIrr").
name: The translated display name (e.g. "External irradiation"). Defining this element is optional.
value: The value of the channel (e.g. "843"). Defining this element is optional.
unit: The unit of the channel (e.g. "W/m^2). For channels which have no u nit, an empty st ring
must be entered.
min: The minimum possible value of a channel. Defining this element is optional.
max: The maximum possible value of a channel. Defining this element is optional.
options: A list with the possible values of a parameter channel. Defining this element is optional.
User Manual SWebBoxRPC-BA-en-14 13
7 Service Procedures SMA Solar Technology AG

7 Service Procedures

This section describes the structure of the available service procedures.
For each procedure, a brief description of its task is given. This is followed by the structure of the request. Variable elements are represented by placeholders in upper-case characters. In this manual, the placeholders VERSION, FORMAT, and ID are not described for each procedure, since their meaning has already been described in Section 4 and it is not necessary to differentiate between all procedures here.

7.1 RPC_GET_PLANT_OVERVIEW

7.1.1 Version 1.0

Returns an object with the following plant data:
•POWER
•DAILY-YIELD
• TOTAL-YIELD
•STATUS
• ERROR
Structure:
RPC={
"version": "1.0",
"proc": "GetPlantOverview",
"id": "ID",
"format": "FORMAT"
}
Sample request:
RPC={
"version": "1.0",
"proc": "GetPlantOverview",
"id": "1",
"format": "JSON"
}
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SMA Solar Technology AG 7 Service Procedures
Sample response:
RPC={
"version": "1.0",
"proc": "GetPlantOverview",
"id": "1",
"result":
{
"overview":
[
{
"meta": "GriPwr",
"name": "Momentanleistung",
"value": "4250",
"unit": "W"
},
{
"meta": "GriEgyTdy",
"name": "Tagesenergie",
"value": "45.23",
"unit": "kWh"
},
{
"meta": "GriEgyTot",
"name": "Gesamtenergie",
"value": "7821",
"unit": "kWh"
},
{
"meta": "OpStt",
"name": "Status",
"value": "MPP",
"unit": null
},
{
"meta": "Msg",
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7 Service Procedures SMA Solar Technology AG
"name": "Fehler",
"value": null,
"unit": null
}
]
}
}
The following data was transmitted:
Power = 4,250 W,
E-Today = 45.23 kWh,
E-Total = 7,821 kWh,
Status = MPP,
No error

7.2 RPC_GET_DEVICES

7.2.1 Version 1.0

Returns a hierarchical list of all detected plant devices.
Structure:
RPC={
"version": "1.0",
"proc": "GetDevices",
"id": "ID",
"format": "FORMAT"
}
Sample request:
RPC={
"version": "1.0",
"proc": "GetDevices",
"id": "1",
"format": "JSON"
}
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SMA Solar Technology AG 7 Service Procedures
Sample response:
RPC={
"version": "1.0",
"proc": "GetDevices",
"id": "1",
"result":
{
"totalDevicesReturned": 6,
"devices":
[
{
"key":"SCC250H9: 1390148531",
"name":" Sunny Central E1",
"children":
[
{
"key": "SCBFS016:8945",
"name": "Sunny BFS E1",
"children": null
},
{
"key": "SMU8b004:2567",
"name": "String Monitoring Unit E1",
"children": null
}
]
},
{
"key": "SCC250H9:1390148538",
"name": "Sunny Central E2",
"children":
[
{
"key": "SCBFS016:8956",
"name": "Sunny BFS E2",
"children": null
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7 Service Procedures SMA Solar Technology AG
},
{
"key": "SMU8b004:2534",
"name": "String Monitoring Unit E2",
"children": null
}
]
}
]
}
}

7.3 RPC_GET_PROCESS_DATA_CHANNELS

7.3.1 Version 1.0

Returns a list with the meta names of the available process data channels for a particular device type.
Structure:
RPC={
"version": "1.0",
"proc": "GetProcessDataChannels",
"id": "ID",
"format": "FORMAT",
"params":
{
DEVICE_KEY
}
}
DEVICE_KEY: The device key of a device of the type for which the process data channels are to
be returned.
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SMA Solar Technology AG 7 Service Procedures
Sample request:
RPC={
"version": "1.0",
"proc": "GetProDataChannels",
"id": "1",
"format": "JSON",
"params":
{
"device": "WR715-19:263415747"
}
}
Sample response:
RPC={
"version": "1.0",
"proc": "GetProcessDataChannels",
"id": "1",
"result":
{
"WR715-19:263415747":
[
"Upv-Soll",
"h-Total",
"Zac",
"Status",
"E-Total",
"Upv-Ist",
"Riso",
"Uac",
"Pac",
"Fehler-Cnt",
"Ipv",
"Netz-Ein",
"Seriennummer",
"Fac"
"Fehler"
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7 Service Procedures SMA Solar Technology AG
"Iac-Ist"
]
}
}

7.4 RPC_GET_PROCESS_DATA

7.4.1 Version 1.0

Returns process data for up to 5 devices per request.
Structure:
RPC={
"version": "1.0",
"proc": "GetProcessData",
"id": "ID",
"format": "FORMAT",
"params":
{
"DEVICES":
[
{
"key": DEVICE_KEY,
"channels": [CHANNELS]
}
]
}
}
A list with the device keys whose process data is to be provided must be transferred as a parameter. You can submit a selection of required process data to each device. If a selection is omitted, all process data will be transmitted.
DEVICES: An array containing objects with the device keys of those devices for which process
data is to be returned, and optional CHANNELS.
DEVICE_KEY: The corresponding device key (see Section6.1 "Device Object", page12).
CHANNELS: An array containing the meta names of the required process data. The available
meta names can be identified with the command RPC_GET_PROCESS_DATA_CHANNELS.
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SMA Solar Technology AG 7 Service Procedures
Sample request:
RPC={
"version": "1.0",
"proc": "GetProcessData",
"id": "1",
"format": "JSON",
"params":
{
"devices":
[
{
"key": "WR715-19:263415747",
"channels": null
},
{
"key": "WR715-19:263415748","key": "WR715-19:263415748",
"channels":
[
"Pac"
]
}
]
}
}
Sample response:
RPC={
"version": "1.0",
"proc": "GetProcessData",
"id": "1",
"result":
{
"devices":
[
{
"key": "WR715-19:263415747",
"channels":
User Manual SWebBoxRPC-BA-en-14 21
7 Service Procedures SMA Solar Technology AG
[
{
"meta": "E-Total",
"name": null,
"value": "1160.987",
"unit": "kWh"
},
{
"meta": "Fac",
"name": null,
"value": "49.98",
"unit": "Hz"
},
{
"meta": "Zac",
"name": null,
"value": "1.346",
"unit": "Ohm"
}
]
},
{
"key": "WR715-19:263415748","key": "WR715-19:263415748",
"channels":
[
{
"meta": "Pac",
"name": null,
"value": "630",
"unit": "W"
}
]
}
]
}
}
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SMA Solar Technology AG 7 Service Procedures

7.5 RPC_GET_PARAMETER_CHANNELS

7.5.1 Version 1.0

Returns a list with the meta names of the available parameter channels for a particular device type, depending on access level. The level is determined by transmitting the MD5 hash value of the respective password in the request header.
Structure:
RPC={
"version": "1.0",
"proc": "GetParameterChannels",
"id": "ID",
"format": "FORMAT",
"passwd" : "PASSWORD",
"params":
{
"key": DEVICE_KEY
}
}
PASSWORD: The MD5 coded hash value of the password for the desired access level.
DEVICE_KEY: The device key of a device for whose type the parameter channels are to be
returned.
Sample request
RPC={
"version": "1.0",
"proc": "GetParameterChannels",
"id": "1",
"format": "JSON",
"passwd": "a289fa4252ed5af8e3e9f9bee545c172",
"params":
{
"device": "WR715-19:263415747"
}
}
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7 Service Procedures SMA Solar Technology AG
Sample response:
RPC={
"version": "1.0",
"proc": "GetParameterChannels",
"id": "1",
"result":
{
"WR715-19:263415747":
[
"Plimit",
"SMA-Grid-Guard",
"SMA-SN",
"Betriebsart",
"Control",
"Ripple-Ctl-Frq",
"PowerBalancer",
"Usoll-Konst",
"Upv-Start",
"Default",
"T-Start",
"Ripple-Ctl-Lev",
"Storage",
"Ripple-Ctl-Rcvr",
"Software-SRR",
"T-Stop",
"Software-BFR",
"Hardware-BFS"
]
}
}
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SMA Solar Technology AG 7 Service Procedures

7.6 RPC_GET_PARAMETER

7.6.1 Version 1.0

Returns the parameter values of up to 5 devices, depending on the access level. The level is determined by transmitting the MD5 hash value of the respective password in the request header.
Structure:
RPC={
"version": "1.0",
"proc": "GetParameter",
"id": "ID",
"format": "FORMAT",
"passwd": "PASSWORT",
"params":
{
"DEVICES":
[
{
"key": DEVICE_KEY,
"channels": [CHANNELS]
}
]
}
}
A list with the device objects whose parameters are to be provided must be transferred as a parameter. You can submit a selection of requested parameters to each device. If this selection is omitted, all parameters will be transmitted.
PASSWORD: The MD5 coded hash value of the password for the desired access level.
DE VIC ES: An arr ay conta ini ng t he devic e ob jects fo r wh ich par ame ters are to b e return ed, and
an optional selection of certain channels.
DEVICE_KEY: The corresponding device key (see Section6.1 "Device Object", page12).
CHANNELS: An array containing the meta names of the required process data. The available
meta names can be identified with the command RPC_GET_PROCESS_DATA_CHANNELS.
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7 Service Procedures SMA Solar Technology AG
Sample request
RPC={
"version": "1.0",
"proc": "GetParameter",
"id": "1",
"format": "JSON",
"passwd": "a289fa4252ed5af8e3e9f9bee545c172",
"params":
{
"devices":
[
{
"key": "WR715-19:263415747"
}
]
}
}
Sample response:
RPC={
"version": "1.0",
"id": "1",
"format": "JSON",
"proc": "GetParameter",
"result":
{
"devices":
[
{
"key": "WR21TL06:2000101000"
"channels":
[
{
"min": "0",
"max": "7",
"meta": "Betriebsart",
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SMA Solar Technology AG 7 Service Procedures
"options":
[
"Stop",
"Konstantspg.",
"Mpp-Betrieb",
"Res1",
"Res2",
"Res3",
"Res4",
"Res5"
],
"value": "Mpp-Betrieb",
"name": "Betriebsart",
"unit": ""
},
{
"min": "2150",
"max": "2150",
"meta": "Plimit",
"value": "2150",
"name": "Plimit",
"unit": "W"
},
{
"min": "0",
"max": "4294900000",
"meta": "SMA-SN",
"value": "2000101000",
"name": "SMA-SN",
"unit": ""
},
{
"min": "125",
"max": "600",
"meta": "Upv-Start",
"value": "150",
"name": "Upv-Start",
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7 Service Procedures SMA Solar Technology AG
"unit": "V"
},
{
"min": "1",
"max": "300",
"meta": "T-Stop",
"value": "4",
"name": "T-Stop",
"unit": "s"
},
{
"min": "125",
"max": "600",
"meta": "Usoll-Konst",
"value": "600",
"name": "Usoll-Konst",
"unit": "V"
},
{
"min": "5",
"max": "300",
"meta": "T-Start",
"value": "10",
"name": "T-Start",
"unit": "s"
},
{
"min": "0",
"max": "100",
"meta": "Software-SRR",
"value": "2",
"name": "Software-SRR",
"unit": "Version"
},
{
"min": "0.005",
"max": "4",
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SMA Solar Technology AG 7 Service Procedures
"meta": "dFac-Max",
"value": "0",
"name": "dFac-Max",
"unit": "Hz/s"
},
{
"min": "0",
"max": "7",
"meta": "Storage",
"options":
[
"permanent",
"volatile",
"Res1",
"Res2",
"Res3",
"Res4",
"Res5",
"Res6"
],
"value": "permanent",
"name": "Storage",
"unit": ""
},
{
"min": "0",
"max": "100",
"meta": "Software-BFR",
"value": "2",
"name": "Software-BFR",
"unit": "Version"
},
{
"min": "0",
"max": "100",
"meta": "Hardware-BFS",
"value": "1",
User Manual SWebBoxRPC-BA-en-14 29
7 Service Procedures SMA Solar Technology AG
"name": "Hardware-BFS",
"unit": "Version"
}
]
}
]
}
}

7.7 RPC_SET_PARAMETER

7.7.1 Version 1.0

Sets parameter values of up to 5 devices and returns the device list submitted in the request with the corresponding current parameter values. A check to see whether every parameter value was set successfully must be carried out by the application used.
Structure:
RPC={
"version": "1.0",
"proc": "SetParameter",
"id": "ID",
"format": "FORMAT",
"passwd": "PASSWORT",
"params":
{
"DEVICES":
[
{
key,
"channels": [CHANNELS]
}
]
}
}
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A list with the device objects whose parameters are to be changed must be transferred as a parameter. Every device object contains a list with the parameters that must be set.
Configuration of the parameters is performed synchronously. Thus, the response time depends on the number of parameters to be set. For the next example, the response time is approx. 10 seconds.
PASSWORD: The MD5 coded hash value of the password for the desired access level.
DEVICES: An array containing objects with the device keys of the devices, and an array with
the CHANNELS whose parameter values are to be set.
DEVICE_KEY: The corresponding device key (see Section6.1 "Device Object", page12).
CHANNELS: An array containing the channel objects to be set for the respective device. A list
with the available parameter channels can be obtained by means of the command RPC_GET_PARAMETER_CHANNELS.
Sample request:
RPC={
"version": "1.0",
"proc": "SetParameter",
"id": "1",
"format": "JSON",
"passwd": "a289fa4252ed5af8e3e9f9bee545c172",
"params":
{
"devices":
[
{
"key": "WR21TL06:2000101000",
"channels":
[
{
"meta": "Betriebsart",
"value": "Mpp-Betrieb"
}
]
},
{
"key": "WR21TL06:2000101001",
"channels":
User Manual SWebBoxRPC-BA-en-14 31
7 Service Procedures SMA Solar Technology AG
[
{
"meta": "Betriebsart",
"value": "Stop"
}
]
}
]
}
}
Sample response:
RPC={
"version": "1.0",
"id": "1",
"format": "JSON",
"proc": "SetParameter",
"result":
{
"devices":
[
{
"key": "WR21TL06:2000101000",
"channels":
[
{
"min": "0",
"max": "7",
"meta": "Betriebsart",
"options":
[
"Stop",
"Konstantspg.",
"Mpp-Betrieb",
"Res1",
"Res2",
"Res3",
32 SWebBoxRPC-BA-en-14 User Manual
SMA Solar Technology AG 7 Service Procedures
"Res4",
"Res5"
],
"value": "Mpp-Betrieb",
"name": "Betriebsart",
"unit": ""
}
]
},
{
"key": "WR21TL06:2000101001",
"channels":
[
{
"min": "0",
"max": "7",
"meta": "Betriebsart",
"options":
[
"Stop",
"Konstantspg.",
"Mpp-Betrieb",
"Res1",
"Res2",
"Res3",
"Res4",
"Res5"
],
"value": "Stop",
"name": "Betriebsart",
"unit": ""
}
]
}
]
}
}
User Manual SWebBoxRPC-BA-en-14 33
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