Connection Ports and Protocols
Hardware Setup
The M64 Touch Controller includes several connectors that enable communication with touch sensors and external systems. Understanding their layout and functions ensures correct wiring, stable communication, and reliable operation.
Sensor Connections
JF1 and JF2 – Touch Sensor Connectors
The M64 Controller uses two FFC connectors (JF1 and JF2) to interface with the DISPLAX touch sensor.
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Connector type: FFC/FPC
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Purpose: Carries sensing and driving signals between the touch sensor and the controller
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Caution: Always connect the FFC cables carefully and evenly to avoid misalignment or damage to the pins.
Communication Ports
JU1 / JU2 – USB Communication (HID Mode)
Two USB connectors are available for data communication and power:
| Connector | Type | Description |
|---|---|---|
| JU1 | Mini USB Type-B | Standard USB-HID communication and power input |
| JU2 | Industrial USB (Molex 502584-0670) | Optional reinforced connection for industrial setups |
💡 It's only possible to have one port at a time.
JI1 – I²C and UART-TTL Interface
The JI1 connector supports both I²C and UART-TTL communication for embedded system integration.
| Pin | Signal | Description |
|---|---|---|
| 1 | +5V (optional) | Supply power (if not powered via USB) |
| 2 | GND | Ground |
| 3 | RX | UART receive |
| 4 | TX | UART transmit |
| 5 | SDA | I²C data line |
| 6 | SCL | I²C clock line |
| 7 | ATTN | Attention signal (I²C interrupt) |
⚠️ Ensure only one communication interface (I²C or UART) is active at a time to prevent conflicts.
JI2 – RS-232 Interface
Provides legacy serial communication for industrial applications.
| Pin | Signal | Description |
|---|---|---|
| 1 | +5V (optional) | Power input (if required) |
| 2 | TX | RS-232 transmit |
| 3 | RX | RS-232 receive |
| 4 | GND | Ground |
Connector Type: Molex 51021-0400 (4-pin housing)
💡 Use a shielded RS-232 cable for long-distance or noisy environments to improve signal integrity.
Mounting and Grounding
The M64 controller includes four mounting holes (Ø 3.6 mm) for secure attachment.
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One hole must be electrically connected to the metal chassis to ensure proper grounding.
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Use ESD-safe tools when handling the board.
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Avoid placing the controller directly on conductive or metallic surfaces without insulation.
⚠️ Improper grounding can cause unstable touch performance or electromagnetic interference (EMI).
🔋 Power Supply
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The controller is typically powered through the USB connection (5V DC).
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When using alternative interfaces (I²C, UART, or RS-232), external 5V power can be applied via the corresponding connector pin.
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Power consumption: Approximately 120 mA @ 5V.
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