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Seven-Segment LED Display Module Specification
Related document: Seven-Segment LED Display Module Technical Manual
| Display Digit Version | Display Digits | Configurable Decimal Points | Default Power-On Display |
|---|---|---|---|
| 1-digit version | 1 digit | 0 to 1 | All zeros |
| 2-digit version | 2 digits | 0 to 2 | All zeros |
| 3-digit version | 3 digits | 0 to 3 | All zeros |
| 4-digit version | 4 digits | 0 to 4 | All zeros |
| 5-digit version | 5 digits | 0 to 5 | All zeros |
| 6-digit version | 6 digits | 0 to 6 | All zeros |
Contents
- Overview
- Selection Information
- Key Features
- Technical Specifications
- Interface and Indicators
- Installation and Wiring
1. Overview
The Seven-Segment LED Display Module is designed for industrial RS485 display applications. It is available in 1-digit to 6-digit versions, with overall dimensions varying by digit count. The module uses the Modbus RTU protocol. The host can refresh the display by writing registers, and parameters such as brightness, decimal point, flashing, slave address, and baud rate are configurable.
| Item | Description |
|---|---|
| Form factor | Panel-mount seven-segment LED display with a rear 4-pin terminal for power and RS485 |
| Interface | RS485 (A/B) and DC power terminals |
| Protocol | Modbus RTU slave, default address 1 |
| Display content | 0 to 9, A to F, -, ., with decimal point and flashing support |
| Version options | 1 to 6 digits, with enclosure size varying by digit count |
2. Selection Information
2.1 Display Digit Versions
| Display Digit Version | Display Digits | Typical Application |
|---|---|---|
| 1-digit version | 1 digit | Single-status indication, single-character workstation code |
| 2-digit version | 2 digits | Short code display, counter status |
| 3-digit version | 3 digits | Single-point current, pressure, or temperature display |
| 4-digit version | 4 digits | Industrial scales, equipment room parameter display |
| 5-digit version | 5 digits | High-resolution process value display |
| 6-digit version | 6 digits | Production line or energy data with a wider numeric range |
2.2 Packing List
- Seven-segment display module x1
- 4-pin terminal block, pre-soldered
- Quick start card with factory default parameters
3. Key Features
- Multiple digit options: One product series covers 1-digit to 6-digit display requirements.
- Direct Modbus display update: Refresh the display through register writes using
0x06or0x10. - Non-volatile parameter storage: Address, baud rate, brightness, and power-on mode are retained after power loss.
- Easy commissioning: Supports all-segments-on, all-segments-off, single-digit writes, batch writes, and flashing control.
- Industrial communications: RS485 differential signaling with a default data rate of 9600 bps and support for higher baud rates.
4. Technical Specifications
4.1 Electrical and Environmental
| Parameter | Specification |
|---|---|
| Supply voltage | 12 V DC typical, supports 9 to 24 V DC |
| Power consumption | < 1 W at full brightness |
| Operating temperature | -20 °C to +70 °C |
| Storage temperature | -40 °C to +85 °C |
| Humidity | 5% to 95% RH, non-condensing |
4.2 Display Performance
| Item | Specification |
|---|---|
| Display digits | 1 / 2 / 3 / 4 / 5 / 6 digits, depending on the selected display version |
| Decimal points | One per digit, up to the total number of digits |
| Brightness levels | 8 levels (0 to 7) |
| Character set | 0-9, A-F, -, blank, ., flashing |
| Power-on mode | All-segments-on test / all off / retain previous display |
4.3 Communication Parameters
| Item | Specification |
|---|---|
| Physical layer | RS485 half-duplex, 2-wire differential, optional 120 ohm termination |
| Protocol | Modbus RTU slave |
| Default settings | Address 1, 9600 bps, 8N1 |
| Configurable range | Address 1 to 254; baud rate 1200 to 115200; stop bits 1 or 2; parity None / Even / Odd |
4.4 Configurable Parameters
| Parameter | Range | Description |
|---|---|---|
| Brightness level | 0 to 7 | 0 is the dimmest and 7 is the brightest |
| Decimal point count | 0 to N | N equals the actual number of display digits |
| Sign handling | Positive / Negative / Auto | Auto shows the minus sign based on the register value written |
| Display retention | Enable / Disable | When enabled, the last display content is retained after power loss |
5. Interface and Indicators
| Terminal | Description |
|---|---|
| V+ | DC 9 to 24 V positive |
| V- | DC negative, common ground with RS485 GND |
| A | RS485 A (+) differential line |
| B | RS485 B (-) differential line |
Indicators
- RUN: Steady on after power-up and flashes rapidly during parameter writes.
- COMM: Flashes during communication and turns off after about 5 seconds without data.
6. Installation and Wiring
- Select the correct panel cutout for the display digit count and secure the module in place.
- Wire the terminals in the
V+ / V- / A / Border. Shielded twisted pair is recommended for RS485, with 120 ohm termination at both bus ends. - Connect the power ground, RS485 GND, and host ground together to reduce common-mode interference.
- Use a unique slave address for each device on the same RS485 bus.
- During commissioning, use the all-segments-on or all-segments-off command first to verify the hardware link, then switch to the normal display mode.
- Manufacturer: Hunan YenGear Tech Co., Ltd.
- Email: [email protected]
- Website: www.yengear.com