D1200M Modbus Modules with Current Input


The D1200M current input modules contain an isolated 15-bit analog to digital converter and measure DC current with full scale input ranges from +/-1mA to +/-1Amp, including 4-20mA. Each module is hardware optimized for the best measurement performance over the full-scale input range. Five different current input ranges are available.

The D1200M module performs all signal conditioning, analog to digital conversion and linearizes the digital data. The digital data values are scaled into 16-bit unsigned integer data format that represent a percentage of the full-scale input range. The data values are transmitted to a host computer using the Modbus RTU serial protocol via an RS-232 or RS-485 serial port.

The D1200M current input modules contain one discrete digital input and two open-collector digital outputs. The digital outputs can be used to control solid-state relays and annunciators.  They can be pulled up to +30Vdc and sink up to 30mA without damage.  The discrete digital inputs can accept +/-30Vdc signals without damage.  The discrete switching levels are <+1Vdc = logic “0”, >+3.5Vdc equals a Logic “1”.

Because the Modbus protocol does not support Echoing the RS-232 versions of D1000M series are limited to one module per serial port. Applications requiring more than one module should use RS-485.

Use the links below to download a Datasheet, User’s Manual or view the Modbus Scaling Example.

Download Datasheet

Download Manual

Modbus Scaling Overview

The D1200M series modules can also be mounted on a DIN-Rail using the MK-1 mounting kit.

Additional Information

Dimensions 3.6 × 2.45 × 1.1 in

• Ranges: +/-1mA, +/-10mA, +/-100mA, +/-1A, 4-20mA.
• Accuracy:+/-0.02% of F.S., 0.04% of FS (4-20mA).
• Resolution:0.01% of F.S. (4-digits) 0.04% of F.S. (4-20mA).
• Common mode rejection: 100db at 50/60 Hz. • Zero drift:+/-1 count max (autozero).
• Span tempco:+/-50ppm/deg C max, (+/-1A=+/-80ppm/deg C).
• Voltage drop: +/-0.1V max.
• Two open-collector digital outputs.
• One digital input.


RS-232 Only, RS-485 Only

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