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2. Current loop - Wikipedia

   en.wikipedia.org/wiki/Current_loop

   To allow the construction of hybrid systems, where the 4–20 mA is generated by the controller, but allows the use of pneumatic valves, a range of current to pressure (I to P) converters are available from manufacturers. These are usually local to the control valve and convert 4–20 mA to 3–15 psi (or 0.2–1.0 bar).

3. Digital current loop interface - Wikipedia

   en.wikipedia.org/wiki/Digital_current_loop_interface

   More than two teleprinters could be connected on a single circuit allowing a simple form of networking. [1] Older teleprinters used a 60 mA current loop. Later machines, such as the Teletype Model 33 , operated on a lower 20 mA current level and most early minicomputers featured a 20 mA current loop interface, with an RS-232 port generally ...

4. Highway Addressable Remote Transducer Protocol - Wikipedia

   en.wikipedia.org/wiki/Highway_Addressable_Remote...

   Both the 4–20 mA current and the digital signal are valid signalling protocols between the controller and measuring instrument or final control element. The polling address of the instrument is set to "0". Only one instrument can be put on each instrument cable signal pair. One signal, generally specified by the user, is specified to be the 4 ...

5. MAX232 - Wikipedia

   en.wikipedia.org/wiki/MAX232

   MAX232 chip in DIP-16 package The die of a MAX232 MAX232 pinout: Red: power, Yellow: charge pump capacitors, Blue: outputs, Green: inputs, Pins 9–12: TTL/CMOS I/O voltages. The MAX232 is an integrated circuit by Maxim Integrated Products, now a subsidiary of Analog Devices, that converts signals from a TIA-232 (RS-232) serial port to signals suitable for use in TTL-compatible digital logic ...

6. Digital loop carrier - Wikipedia

   en.wikipedia.org/wiki/Digital_loop_carrier

   When the subscriber goes off-hook, a cable pair behaves like a single loop inductance coil with a -48 V dc potential and an Electric current of between 20–50 mA dc. Electric current values vary with cable length and gauge. A minimum current of around 20 mA dc is required to convey terminal signalling information to the network.

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