Description

4-20ma/0-12V to RS485 Converter,A/D Converter 
Product Overview:                                          
 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.

Product Selection:                                                       
WJ21  U(A)    â–¡   â–¡
Input Voltage or Current Signal                     Interface
U1：0-5V           A1：0-1mA                  485： output is RS-485 interface 
   U2：0-10V          A2：0-10mA                 232： output is RS-232 interface
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
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

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
Initialization WJ21 modules:
 All WJ21 modules, if you use RS-485 network, must be assigned a unique address code, address code value of hexadecimal numbers between 00 and FF. However, all new WJ31 module uses a factory initial settings, as follows:
 Address code: 01
   Baud rate: 9600 bps
 Checksum is disable
   As the new module address codes are the same, their address will be contradictory to other modules, so when you set up the system, you must reconfigure each WJ21 module address. WJ21 module can be connected the power cord and RS485 communication lines, through configuration commands to modify the WJ21 module address. Baud rate, parity and status, communication protocols also need to be adjusted according to user requirements. In the modified baud rate, parity and status, communication protocol, you must first enter the module to the default state, or can not be modified.