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Y811-52AV — Compact Sounder-Beacon Technical Manual
This manual covers the Y811-52AV compact sounder-beacon. The hardware uses RS485. The ordered configuration may use the custom RS485 protocol or the standard Modbus RTU profile listed in the Y811-52AV specification.
1. Safety and scope
Y811-52AV provides auxiliary audible and visual warning. It is not an emergency-stop circuit, a certified fire-alarm panel, a life-safety system, or a safety-rated control circuit.
The listed supply is DC 9-30 V. Disconnect power before wiring, changing the mounting, accessing the enclosure, or changing the ordered communication configuration. The enclosure is listed as non-waterproof.
2. Confirmed configuration
| Parameter | Confirmed information |
|---|---|
| Product function | Compact audible-visual alarm |
| Communication interface | RS485 |
| Protocol options | Custom RS485 protocol or standard Modbus RTU |
| Modbus baud rate | 9600 bit/s for the supplied Modbus reference |
| Output power | 1 W |
| Memory | 4 MB |
| Supply | DC 9-30 V |
| Mounting | Panel mounting or bracket mounting |
| Mounting hole | 30 mm diameter listed in the supplied parameter table |
| Light body | 52 mm diameter listed in the supplied parameter table |
| Overall dimensions | 52 x 104 mm |
| Light colors | Yellow, green, and red |
| Light modes | Flashing, burst flashing, and steady |
| Enclosure | ABS, non-waterproof |
| Operating temperature | -20°C to 60°C listed in the supplied parameter table |
| Trigger inputs | Not stated in the supplied material |
Use the protocol and hardware configuration that match the ordered unit. Do not assume that the standard Modbus profile applies to a unit ordered with the custom RS485 protocol.
3. RS485 wiring and commissioning
Use a twisted pair for RS485 A and B. Keep the bus away from motor cables, relay outputs, and high-frequency switching devices. Use a daisy-chain topology for multiple devices and assign a unique address to each device.
The supplied protocol reference confirms RS485 but does not define the connector pinout or wire colors. Follow the label on the delivered cable or the production drawing. Do not infer A/B polarity from another Y811 model.
The supplied Modbus reference confirms:
| Parameter | Confirmed value |
|---|---|
| Physical interface | RS485 |
| Protocol | Modbus RTU |
| Baud rate | 9600 bit/s |
| Frame fields | Device address (1 byte), function code (1 byte), start address (2 bytes), data (N bytes), and CRC (2 bytes) |
| CRC byte order | CRC-L followed by CRC-H |
| Reference frame | FF 06 00 01 00 00 XX XX |
The reference identifies FF as a super address that can be changed to the corresponding device address. It does not establish FF as the default address. XX XX are CRC placeholders. The supplied reference also does not state parity, stop bits, data-bit settings, or the complete CRC calculation procedure.
4. Standard Modbus command reference
The supplied command reference uses Modbus function code 06 in its examples. The command values below describe the standard Modbus profile:
| Command value | Function |
|---|---|
0x0F | Play a specified folder and track; the reference also shows light-state combinations such as steady red or slow-flashing yellow |
0x01 | Play the next track |
0x02 | Play the previous track |
0x03 | Play a specified track; the reference shows light-state combinations |
0x04 | Increase volume |
0x05 | Decrease volume |
0x06 | Set volume |
0x08 | Loop a single track without specifying a track in the command |
0x09 | Select the playback device, such as USB disk or flash memory |
0x0B | Set the baud rate; the reference example sets 9600 bit/s |
0x0C | Reset the chip |
0x0D | Start playback |
0x0E | Pause playback |
0x11 | Enable or disable looping of all tracks |
0x16 | Stop the current playback |
0x17 | Loop playback of a specified folder |
0x18 | Play tracks randomly across the device |
0x19 | Enable or disable looping of the current track |
0xC0 | Set the device address |
0xC2 | Control the D1 warning lamp independently of the current playback state |
The reference examples include:
FF 06 00 0F 02 07 XX XXfor folder 2, track 7FF 06 00 06 00 1E XX XXfor volume 30
Replace the CRC placeholders with the CRC calculated for the complete frame. Verify the address, selected protocol, and command against the delivered configuration before sending a command.
4.1 Extended playback, address, and light-control frames
The supplied reference gives the following standard Modbus request examples. The examples use the reference's FF super address and XX XX CRC placeholders:
| Command | Request example | Meaning |
|---|---|---|
0x11 | FF 06 00 11 00 01 XX XX | Enable looping of all tracks |
0x11 | FF 06 00 11 00 00 XX XX | Disable looping of all tracks |
0x16 | FF 06 00 16 00 01 XX XX | Stop the current playback |
0x17 | FF 06 00 17 00 01 XX XX | Loop playback of folder 01 |
0x18 | FF 06 00 18 00 00 XX XX | Play the entire device randomly |
0x19 | FF 06 00 19 00 00 XX XX | Enable looping of the current track |
0x19 | FF 06 00 19 00 01 XX XX | Disable looping of the current track |
0xC0 | FF 06 00 C0 00 01 XX XX | Set the device address to 01 |
0xC0 | FF 06 00 C0 00 63 XX XX | Set the device address to 99 |
The reference uses command 0xC2 for independent D1 warning-lamp control:
| Request example | Meaning |
|---|---|
FF 06 00 C2 00 11 XX XX | Red steady; keep the current playback state unchanged |
FF 06 00 C2 00 23 XX XX | Green slow flash; keep the current playback state unchanged |
FF 06 00 C2 00 32 XX XX | Yellow rapid/burst flash; keep the current playback state unchanged |
FF 06 00 C2 00 60 XX XX | Turn the warning lamp off |
For the general light-control format FF 06 00 C2 00 XY CRC-L CRC-H, the reference defines the two value nibbles as follows:
| X value | Light mode | Y value | Light color |
|---|---|---|---|
1 | Steady | 1 | Red |
2 | Slow flash | 2 | Yellow |
3 | Rapid/burst flash | 3 | Green |
6 | Off | 0 | Off |
The reference also shows FF 06 60 03 00 01 XX XX for playing the first track while keeping warning lamp D1 off. Calculate CRC-L and CRC-H from the complete frame before sending any request.
4.2 Query frames (Modbus function 03)
The supplied reference lists these query requests:
| Command | Request example | Query |
|---|---|---|
0x4D | FF 03 00 4D 00 00 XX XX | Current track |
0x42 | FF 03 00 42 00 00 XX XX | Current playback status |
0x43 | FF 03 00 43 00 00 XX XX | Current volume |
0x49 | FF 03 00 49 00 00 XX XX | Number of files on the device |
0x70 | FF 03 00 70 00 00 XX XX | Current sound and light status |
The supplied reference shows the query request frames but does not define the response byte layout or the value encoding for each returned status. Confirm the delivered protocol revision before implementing response parsing.
5. Custom RS485 protocol
The parameter table lists a custom RS485 protocol option but does not provide its frame definition or command table. Request the configuration-specific protocol sheet before integrating a unit ordered with the custom protocol. Do not send the standard Modbus command map to that configuration.
6. Installation, troubleshooting, and maintenance
- Confirm the DC 9-30 V supply and polarity before energizing the unit.
- Confirm panel or bracket mounting and leave the sound openings clear.
- Keep the enclosure away from water because the unit is listed as non-waterproof.
- Test one unit on a short RS485 cable before adding other devices.
- Record the selected protocol, address, baud rate, and configuration in the service record.
| Symptom | Likely cause | Action |
|---|---|---|
| No light or sound | Wrong supply, reversed polarity, or disabled output | Check DC voltage, polarity, terminal labels, and the local command |
| Modbus unit does not reply | A/B reversed, wrong address, serial framing, or CRC | Verify the selected profile and test one unit |
| Command is ignored | Custom protocol selected or unsupported command | Confirm the ordered protocol and use its command sheet |
| Light works but audio does not | Audio file, command, or configuration issue | Confirm the playback command and delivered audio configuration |
| Enclosure is exposed to water | Non-waterproof installation | Move the unit to a protected location or select a suitable model |
7. Confirmation items
- Selected custom or standard Modbus protocol
- Default address, parity, stop bits, data bits, and complete CRC calculation details
- Connector pinout and A/B labeling
- Query response layout and status-value encoding
- Sound level, trigger inputs, audio-file replacement method, and enclosure drawing
Source basis
- Supplied product catalog, page 17
- Supplied model parameter table
- Supplied Modbus protocol reference: RS485 interface, 9600 bit/s, frame structure, playback/light-control commands, and query commands
- Product series: Industrial Audible & Visual Alarm
- Model: Y811-52AV
- Y811-52AV specification