Switch Module
The switch module offers a versatile solution with 24 inputs specifically designed to accommodate a wide range of switches, whether they are mechanical or electronic in nature. This module supports various types of switches, including toggles, pushbuttons, rotational switches, and any other electrical contact-based switches or opto-coupler outputs.
The switch module is equipped with a convenient built-in pull-up and debounce circuit, eliminating the need for complex wiring. With this feature, a simple contact to ground is all that is required for seamless operation.
Each time a switch input is connected to ground, a "switch close" event is signaled, generating a corresponding message. Conversely, when the ground connection is removed, a "switch open" message is generated, indicating the change in the switch's status.
The structure of the CAN bus data field sent by a switch module is as follows:
| Byte | Description | Values |
|---|---|---|
| 0 | Node ID | 1-255 |
| 1 | Data Type | BCHAR (11) |
| 2 | Service Code | <switch num> |
| 3 | Message Code | <message num> |
| 4 | Data Byte 1 | <Switch State> |
| 5 | Data Byte 2 | 0 |
| 6 | Data Byte 3 | 0 |
| 7 | Data Byte 4 | 0 |
The bitfield in Data Byte 1 is as follows:
| Bit | Description | Values |
|---|---|---|
| 0 | Switch ON | Set to 1 in the case of a switch close event |
| 1 | Switch OFF | Set to 1 in the case of a switch open event |
| 2-7 | unused | 0 |
Switch modules use CAN Identifiers in the range of