A-1012 is an RS485 and USB remote IO unit with 2 digital inputs, 2 analogue Inputs (0/4 to 20 mA), 2 PT100 temperature Inputs, 2 transistor digital outputs and 2 analogue outputs. The unit supports both Modbus RTU and Modbus ASCII protocols. The USB port can be used for configuration or can be used as the main communication interface, installing as a virtual serial port: no external power is required when connected to USB. Featuring a robust industrial construction with the use of optical isolators to prevent ground loop effects and limits damages from power surges.

A-1012 Application examples

• PT100 temperature sensor to Modbus 
• Digital control with Modbus
• Driving analogue signals
• Converting analog signals to digital Modbus

A-1012 Communication protocol

• Modbus RTU
• Modbus ASCII
• USB 

A-1012 Specification

• 2 x Digital Inputs (with opto Isolation)
• 2 x Digital Outputs: (Souce Transistor rated 1A @ 10-35VDC)
• 2 x Analogue input Type: 0-20mA, 4-20mA
• ADC Resolution: 16-bit
• 2 x PT-100/PT1000
• Temperature Ranges: (PT-100:-200~+600°C), (PT-1000:-200~+600°C)
• 2 x Analogue Outputs: (12-bit)
• Analogue Outputs Type: 0-20mA, 4 -20mA
• Input Impedance:
  • Current: 100 Ω
  • RTD : 10 MΩ
• Input Accuracy: ±0.1%
• Sampling Rate: 10 sample/second (total)
• CMR @ 50/60 Hz: 120 dB
• LED indication of IO status
• Output state pre-settable on Comms fail
• Output state pre-settable on power-up
• Input/Output Operating Frequency: 10HZ
• Interface:
  • RS485
  • USB - installs as a virtual serial port
• Protocol - Modbus RTU or Modbus ASCII
• Communication Baud Rate: 1200~115200bps
• Isolation Voltage: 5000 V DC
• Surge , EFT And ESD Protection
• Operating Temperature: - 20 to 75º C
• Power:
  • 10 to 30VDC, 24VAC (RS485)
  • via USB port
• Panel or DIN Rail mount
• Dimensions - 72mm x 118mm x 39mm

A-1012 Configuration Software

The unit is configured using the free Utility Software. This can be used to set the units' IP address and to set the input ranges and monitor inputs.