Menu of Smart Detector User Manual - Page A0 - Back to TOP -

Paperless Datasheet
Going green and protecting environment is manufacturers' responsibility. Each WatchfulEyE product has a link of downloading data sheet on its enclosure:

Model & Ordering Code

Model Ordering Code UPC/EAN Code
WTH-CS/RS485 USR121084 (0) 811914030003
WTH-CS/RS485N US121084
WTH-CS/RS485/AC-R USR127325 (0) 811914030034
WTH-CS/RS485/AC US127325 (0) 811914030003

Product Feature Comparison

Rating Voltage USB (DC5V) USB (DC5V) USB or 100-240VAC USB or 100-240VAC
Remote Monitoring NO/NC / NO/NC /
Modbus Yes / Yes /
UL Listed Yes / / / - Page A1 - Back to TOP -

Application Range
WTH-CS/RS485/AC series surge counter is used to test and record the discharge frequency of the surge protector ( record the surge current rush frequency beyond certain degree) and SPD remote contacts monitoring, which is convenient for users to do statistics and analysis on the surge situation in specific area.
It can be used accompanying with various surge protectors or used as the supported product of the surge protective box.
In accordance with: IEC 62561-6:2018 --- Lightning protection system components (LPSC) - Part 6: Requirements for lightning strike counters (LSC)

Main Features
1. Large counting range, wide application range
2. Sensitive response, precision counting, no mis-operation
3. 3-bit digital display, easy and clear to recognize
4. No data loss in case of power outages
5. DIN-rail installation, convenient for installation and replacement
6. Adopting single-chip technology, advanced and reliable structure
WTH-CS/RS485/AC Series Technical Data
Effective action current >1kA
Max. discharge current (8/20µs) 80kA
Sampling mode Inductance coil
Counting number 0~999
Protection Rating (IP Code) IP 20
Temperature Range - 40° to 176°F (-40° to 80°C)
Relative Humidity 0% to 95% noncondensing
Maximum Operating Altitude 10,000 feet (3000m)
DIN Rail EN60715 35mm top-hat rail
Housing Material Thermoplastic (UL94 V-0)

Installation Instruction
The surge protective devices smart detector shall be employed in a Listed enclosure or closet that is only accessible to technicians or service personnels.

Certificates of Products - Page A2 - Back to TOP -

WTH-CS/RS485 Series Dimensions

Detector Status Description

Power (green): Power indicator, when the power is turned on, the indicator light is on
Data (orange): Data sending indicator, when there is data sending, the indicator flashes
Alarm (red): The alarm indicator light, or when the number of surges increases, keeps on, press the Reset button to reset the light off; when the surge protector failure is detected, it keeps on - Page A3 - Back to TOP -

LCD Display Description

LCD display 0-9 numbers and A-F letters, check the following table:

Modbus Mode: RS485 ID, Surge Counts
I. Turn on the power, the LCD screen first displays the RS485 address (factory value 001), and then displays the number of surges, the screen keeps displaying this value

II. Continuing pressing RESET to enter SETTING status. When the Alarm light flashes frequently, continue pressing it, the indicator light loops from bottom to top. - Page A4 - Back to TOP -

Setting Steps

1. When ALARM indicator flashes frequently, short press RESET, switch to NO/NC, default: 0 (NO: normal, NC: fault)

2. When Modbus indicator flashes frequently, short press RESET to set RS485 ID address (RS485 ID: 1-247)

3. When POWER indicator flashes frequently. Short press RESET to save data and return to the Standby mode. (Data can also be saved automatically after 30 seconds and return to Standby mode without pressing RESET in any setting status) - Page A5 - Back to TOP -

WTH-CS/RS485 Connection Diagram - Page A6 - Back to TOP -

WTH-CS/RS485/AC-R Connection Diagram

Power supply (100-240VAC or USB-5VDC):
When the L-N power cord is connected, the LED light is on (you can also choose to connect the USB power adapter) - Page A7 - Back to TOP -

WTH-CS/RS485/AC Connection Diagram

Power supply (100-240VAC or USB-5VDC):
When the L-N power cord is connected, the LED light is on (you can also choose to connect the USB power adapter) - Page A8 - Back to TOP -

Inductance Coil Connection Diagram - Page A9 - Back to TOP -

Inductance Coil Connection Diagram

A: If the grounding wire can penetrate the magnetic ring, and Imax of the surge protector is less than 80kA
B: If the grounding wire cannot penetrate the magnetic ring, or Imax of the surge protector is greater than 80kA, use the shunt connection method - Page A10 - Back to TOP -

Server Modbus Networking System Diagram

Test Steps
Step 1: Modbus (Page A6)
Step 2: USB Power (Page A6 | Page A7)
Step 3: NO/NC (Page A5)
Step 4: RS485 ID (Page A5)
Step 5: RS485 connected to the computer (Page A6 | Page A7)
Step 6: Download software
Step 7: Test read data - Page B1 - Back to TOP -

Communication Protocol: Modbus RTU
Baud rate: 19200 (Customized: 4800/9600/19200/38400)
Data bits: 8 bit
Parity Check: none
Stop bit: 1 bit

03 Read Holding Register
Address Description Read/Write Data Type Length
0 System reservation R Integer 1
1 Device address high position R Integer 1
2 Device address low position R Integer 1
3 System reservation R Integer 1
4 Cloud service data sending cycle R/W Integer 1
5 Surge count value R Integer 1
6 RS485 working mode (0:modbus 1:cloud) R Integer 1
7 Modbus address R Integer 1
8 Modbus baud R Integer 1
9 SPD remote communication state (0:Normal open 1:Normal close) R Integer 1
10 SPD Remote Alarm mode (0:NC Alarm 1:NO Alarm) R/W Integer 1
11 Device state (0:Normal 0xffff: Alarm) R Integer 1 - B2 - Back to TOP -

FAQ & Help (1/2)
1. What should I do if I can't find the paper manual in the product packaging?
Watchful Eye products is committed to going green with paperless data sheets. On the left side of each product enclosure is an engraved link with URL for downloading paperless data sheet and QR code of the website. If you need the paper data sheet, you can open the link and print the data sheet by yourself.

2. Some questions about Product Serial Number
a. Each product has a unique product serial number, and the barcode is laser engraved on the side of the product when it leaves the factory, for example: S.N.: USR127325-7AG002
b. This serial number is a certificate for tracking product warranty and service

3. Characteristics of wide voltage, rated working voltage (Un): What are the advantages of 100-240VAC?
If you don't know what kind of power network the system is, it is commonly used in systems below 100-240VAC, such as: 110V, 120V, 220V, 230V, etc., to avoid confusion about your selection.

4. Can you describe some application skills about NO/NC (normally open/normally closed) interface?
a. The remote signal of the lightning protection device is recommended to be connected to the COM-NC (normally closed) interface, because when the lightning protection device is not connected, the normally open interface defaults to the normal equipment
b. NO (Normally Open) and NC (Normally Closed) interfaces can be extended to alarm equipment for digital signal input, such as access control, glass broken, water immersion alarm, temperature, humidity, smoke, etc
c. Normally open interface, when there are more digital alarm devices connected, it can be connected to the COM-NO (normally open) interface in parallel, when any device alarms, it will become a COM-NC (normally closed) signal - Page C1 - Back to TOP -

FAQ & Help (2/2)
5. I have question for Surge Counter how the minimum of Input Current for testing?
Surge count test of minimum input current:
It is tested in the factory with a 1.2/50μs + 8/20μs combination wave generator
If it is only to test the digital display of the surge count, a 10μF 400V capacitor can be used, refer to the following steps
Note: This method cannot simulate 8/20μs surge waveform.

Step 1: Turn on the power switch to charge the capacitor for 1 second
Step 2: Turn on the power switch to make the capacitor short-circuit discharge - Page C2 - Back to TOP -

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After-sale Services
Watchful Eye provides a 5-year quality warranty globally.

I have a question - Page C3 - Back to TOP -

Monitoring Server Network System Diagram

Combined Model
Model Ordering Code UPC/EAN Code
WTH-CS/F-D USR127209 - Page D1 - Back to TOP -

Server Modbus Networking System Diagram - Page D2 - Back to TOP -