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.
