Precision Analog Signal Conversion Module with RS-485/232 Interface

• Customization: Available
• Conductive Type: Bipolar Integrated Circuit
• Input Type: Differential
• Model NO.: WJ21
• Integration: GSI
• Operating Temperature: -40℃ - 85℃
• Resolution: 12 Bit
• Shape: DIP
• Technics: Semiconductor IC
• Input Type1: Input Current / Voltage Input
• Accuracy: 0.1%
• Temperature Drift: ± 30 Ppm / ºC (± 50 Ppm /
• Input Resistance: 100 (0-10mA/0- ± 10mA Current Input)
• Bandwidth: -3 dB 10 Hz
• Conversion Rate: 10 Sps
• Common Mode Rejection (Cmr): 120 dB (1K Source Imbalance @ 50/60 Hz)
• Input Protection: Over-Voltage Protection, Over-Current Protection
• Communication: RS-485 Protocol or RS-232
• Transport Package: Wayjunr
• Specification: 120mm x 70mm x 43mm
• Trademark: wayjunr
• Origin: Guangdong, China
• Production Capacity: 9999

Product Description

Analog Signal to RS485/232 Converter
(WJ21 series A/D Converter) 

Features:
>> Analog signal acquisition, isolated RS-485/232 output
>> 12-bit AD converter, testing accuracy>0.1%
>> Can Program and calibrate modules accuracy via RS-485/232 interface
>> Three-port isolation (input/output/assistant power supply): 3000VDC
>> Wide power supply: 8~32VDC
>> High reliability, easy programming, easy installation.
>> Can program setting module address, baud rate
>> 0-5V voltage signal or 4-20mA current signal input
>> Supports Modbus RTU protocol
>> DIN35 Rail-mounted
Typical Application:
>> Signal measurement/monitoring/control
>> RS-485 remote I / O, data acquisition
>> RS-232/485 bus industrial automation control system
>> Industrial field signal data acquisition and recording
>> Industrial field signal isolation and long-term transmission
>> Medical, industrial product development
>> 4-20mA or 0-5V signal acquisition

Product Selection:	WJ21 U(A)
Input Voltage or Current Signal	Interface
U1:0-5V                            A1:0-1mA  U2:0-10V                        A2:0-10mA  U3:0-75mV                      A3:0-20mA  U4:0-2.5V                        A4:4-20mA  U5:0-±5V                        A5:0-±1mA  U6:0-±10V                      A6:0-±10mA  U7:0-±100mV                A7:0-±20mA  U8:user-defined            A8:user-defined	485: output is RS-485 interface 232: output is RS-232 interface	Sample 1: part No.:WJ21 A4-485 4-20mA input signal,output is RS485 interface Sample 1: part No.:WJ21 U1-232 0-5V input signal,output is RS232 interface

Company Profile

Shenzhen Weijunrui Technology Co., Ltd

Since: 2011
Specialty: The company's main products include analog acquisition modules, signal isolators/conversion modules, and signal transmitters
Capacity: Produce 10000 per month
Advanced Features:
Switching to TCP/network/remote IO module, Modbus RTU to TCP, RS232/485 to Ethernet, analog signal (current/voltage/thermistor/frequency/displacement/speed/pulse) isolation transmitter, mV differential signal amplifier, isolation amplifier, micro power DC-DC module power supply, etc

Global Showrooms

Factory Capabilities

Product Overview: Figure 1 WJ21
 WJ21 series products realize the signal acquisition between sensor and host, to measure analog signals. WJ21 products
can be applied to RS-232/485 bus industrial automation control system,4-20mA / 0-5V signal measurement, monitoring
and control,0-75mV ,0-100mV and other small-signal measurement and signal isolation and long-term industrial
transmission and so on.
Products include power supply isolation, signal isolation, linearization, A/D conversion and RS-485 serial
communication. Each serial interface can connect up to 255 pieces WJ21 Series modules, communication using ASCII
code or MODBUS RTU communication protocol, and its instruction set compatible with the ADAM modules, baud rate
can been set by the code, with other manufacturers control module hang in the same RS-485 bus for easy programming. 

WJ21 series products are based on SCM's intelligent monitoring and control system, users set the calibration value,
address, baud rate, data format, checksum status, and configuration information are all stored in nonvolatile memory
EEPROM.
 WJ21 products are according to industry standard design, isolation between signal input / output, can withstand
voltage 3000VDC, high anti-interference ability and reliability. Operating temperature range is - 45 ~ +85 °C. 

Function Description:
WJ21 signal isolation acquisition module can be used to measure one channel voltage or current signal,
1. Analog signal input
 12-Bit acquisition accuracy, all products signal input range have been calibrated. In use, users also can program
calibration easily.
 About the specific current or voltage input range, please see product selection.
2. Communication protocol
 Communication Interface: one channel standard RS-485 communication interface, or one standard RS-232
communication interface, specify when ordering.
 Communication Protocols: supports two protocols, characters protocol of the command set defined and MODBUS
RTU communication protocol. Can be programmed using the kind of communication protocol, can be achieved with
PLC, RTU of many Brands or computer monitoring system for network communication.
 Data Format: 10 Bits. 1 start bit,8 data bits,1 stop bit.
 Address: (0 to 255) and baud rate (2400,4800,9600,19200,38400 bps) can be set, the most long-distance about
communication networks is up to 1200 meters, through the twisted-pair shielded cable.
 Communication interface of high anti-jamming design, ± 15KV ESD protection, communication response time is less
than 100mS.
 3. Anti-jamming
 According to need to set the checksum. Module internal has transient suppression diodes, can inhibit a variety of surge
pulse, protection module, and internal digital filter can also be well suppressed from the grid frequency interference. 

FAQ

Q: How to contact you?
A: Please contact us via email or online customer service