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Input：  4×Analogue inputs (Voltage / Current)
Output:  1×Digital output(RS-232/485)
Accuracy：  0.05%
Input offset：    ±0.1 uA/℃
Temperature Drift：  ±15 ppm/℃ (±30 ppm/℃, max)
Input Resistance：  50Ω (4-20mA/0-20mA/0-±20mA current input) 
                   100Ω (0-10mA/0-±10mA current input)
                   1KΩ (0-1mA/0-±1mA current input)                                      
                   >1MΩ(voltage input)       
Band width： -3 dB 10 Hz
Switching rate：10 Sps
Common mode restraint(CMR)： 120 dB（1kΩ Source Imbalance @ 50/60 Hz）             
Normal mode restraint(NMR)：  60 dB （1kΩ Source Imbalance @ 50/60 Hz）
Input terminal protection： over-voltage/over current protection
Communications：  protocol  RS-485 or RS-232 ASCII character communication protocol
and MODBUS RTU communication protocol.
                  Baud rate（300、600、1200、2400、4800、9600、19200、38400bps）
　　　　　　　　software selectable.  Address（00H~FFH）software selectable
Response Time：100 ms max
Operation Power Supply：    +8 ~ 50 VDC wide power supply range,
                            internal anti-reverse & over-voltage protection              
Watt consumption：     < 1W                               
Isolation withstand voltage：between input and output：  3KVDC，1 minute，stray current 1mA
                          Output and power are common-ground.
Impulse withstand voltage： 3KVAC， 1.2/50us(peak value)
Dimensions：123 x 70 x 30mm