Software » Campo

h1. Intro

With the TDT-Protocol sensors can just send their values on the BUS without complex object catalogue.

An monitor-software is able to display values without knowing anything about the sensors or their configuration.

The CANId cinsists of an function code and the node id. Like CANOpen the function code is 4 Bits and the Node-ID is 7 Bit.

In CAN2.0A there can only be 128 Nodes.

CAN 2.0A: 0..0x7FF

CANOpen: 4 Bit Function code, 7 Bit Node-ID

Node-Id: 0..0x7F

Function-Code Mask: 0x780

There are 14 or 28 Filters on STM32Fs

Some STM32 have an internal 96-bit unique ID.

|_. Bits |_. Area   |_. Decription        |_. Examples             |

| 4      |/2.CAN-Id | Function code       | Send object            |

| 7      |            NodeId              | Sensemux WZ            |

| 16 	 |/4.Data   | Object 	          | Set illumination       |

| 8 	 |            Unit 	          | promilPwm              |

| 8 	 |            Flags 	          | Confirmation required  | 

| 32 	 |            Value 	          | 350‰                   |

| 64Bits Data|      |                     |                        |

[[NMT]]

[[MMP]]

[[Alerts]]

h2. Function code

Function code can be 0..15 / 0x00..0x0F

|_. Code |_. Decription    |_. Examples             |

| 0x0    | NMT-Write       |                        |

| 0x1    | NMT-Send        |                        |

| 0x2    | NMT-Introduce   | Device sends UID only  |

| 0x3    | NMT-setId       | Set NodeId on Device   |

| 0x4    | Alarms          | Send by nodes          |

| 0x5    | Write object    | Set Date, illumination |

| 0x6    | Read object     | Get product codes      |

| 0x7    | Send object     | Send temperature       |

| 0x8    | Resend object   | Replay recorded data   |

| 0x9    | data blob       |                        |

h2. Node-ID

Depending on the function code, the Node-ID can be the target or the source. Node-ID '0' means every node should inspect the message.

|_. Function code |_. Node-ID interpretation|

| NMT-Write       | Destination or 0        |

| NMT-Send        | Source                  |

| NMT-Introduce   | Source                  |

| NMT-setId       | New Node-ID             |

| Alarms          | Source                  |

| Write object    | Destination or 0        |

| Read object     | Targeted Source         |

| Send object     | Source                  |

| Resend object   | Replayed Source         |

| data blob       | Destination             |

h1. IDs, ranges and commands

h2. Node IDs

* 11-Bit-Identifier, (CAN 2.0A); 2048; 0x0 ... 0x7F0; 0x0 ... 0x7F with function code

* 29-Bit-Identifier, (CAN 2.0B); 0x20000000

|_. Range      |_. Decription           |_. Examples              |

| 0x01-0x0F    | Network Manager        | PC                      |

| 0x10-0x2F    | Active controller      | CANDis                  |

| 0x30-0x4F    | Actor                  | CANSwitch               |

| 0x50-0x6F    | Sending sensors        | Sensemux, CANIO         |

| 0x70-0x7F    | Passive Sensors        | CANRec                  |

h2. CAN data structutre

|_. Size |_. Decription |_. Examples                                                                                |

| 2      | Object       | Set ambient illumination                                                                  |

| 1      | Unit         | hz, Float, Time, Date, Percent, promilPwm, centiCelsius, canId, room, Multipacket-String  |

| 1      | Flags        | Confirmation required                                                                     |

| 4      | Value        | The kind of data that was specified in 'unit'                                             |

h2. Objects

|_. Code                  |_. Description             |

| none                    |                           |

| ambientLight            |                           |

| plantLight              |                           |

| multimediaSwitch        |                           |

| mainSwitch              |                           |

| date                    |                           |

| time                    |                           |

| dummy                   |                           |

| plantSensor             |                           |

| plantSensor [0-7]       |                           |

| firmwareVersion         |                           |

| firmwareDate            |                           |

| hardwareRevision        |                           |

| hardwareDate            |                           |

| temperatureIntern [0-7] |                           |

| temperatureExtern [0-7] |                           |

| humidity                |                           |

| VOC                     |                           |

| Replay                  |                           |

| Data-Dump (SD-Card)     |                           |

h2. Units

* Date: year 2B, month 1B, day 1B

* Time: hour 1B, minute 1B, second 1B, subsecond 1B

h2. Example: Turn on the lights

|_.Data   |_.Size   |_.Description                              |

|0x300    | 29 Bits | Function code: Write Object; All objects. |

|0x0      | 2 Byte  | Object: Ambient illumination              |

|0x1      | 1 Byte  | Data-Type: PWM Permill                    |

|0x1      | 1 Byte  | Flags: None                               |

|1000     | 4 Byte  | Value: Full Brightness                    |