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8-channel Di High-speed Counter Approach Switch Pulse Signal To Rs-485/232 Acquisition Module Modbus Rtu - Power Tool Accessories - AliExpress
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4-way encoder pulse counter, 8-way DO, MODBUS TCP module [WJ96] - $59.00 : Wayjun Industrial Automation, 4-20mA to RS485|RS-485 to 0-5V|Pt100|0-10V|RS232|0-75mV|0-100mV|DC DC converter|Signal Isolator|Conditioner|Analog to Digital Converter|DC-DC
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Modbus Remote IO Module IOT Data Acquisition High Speed Pulse Counter Digital Input 8 Sink Output M160|output|output module - AliExpress
Rayleigh Instruments - Manufacturer and stockist of an extensive range of energy monitoring products
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16 Digital Inputs RS485/232 Modbus RTU Stc-101 Remote Terminal Units - China Io Module, Pulse Counter | Made-in-China.com
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