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Holger Blümler
RS232 Terminal for direct connection
Post Date:
2017-09-22 10:00:04

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And it still goes! Using this app, and a little DIY hardware, you can now with your iPhone ™ and iPodTouch ™ make a direct connection to external devices via RS232. And this without going through a Mac or PC.

This opens up for many interested users completely new possibilities for device control, and indeed on proven and simple way. With this app you establish a wired RS232 transmission from your iP / iPT to your external equipment. Depending on the type of use you need possibly another level converter, for the DIY-proposal presented here is only TTL level before – for the electronics is not a problem. The connection is made at the 4-pin headphone jack. The extra hardware consists of a transistor, three resistors and a 4-pin headphone connector. The parts are available in all electronic parts stores and electronic components web stores, eg CONRAD. For the operation of the hardware as TTL interface you do not need any extra power supply.

The app is very easy to use. Connect the hardware to yourself, the 4-pin headphone socket and operate one of the 12 function keys. In the operation mode selected by default “Function” you can send test texts on keypress. Each button is preset with a test text. You can change this default setting at any time by pressing the mode button “Contence” and press the required button to change. The equality also applies to the button label, where you previously choose “Title” for readers to modify the desired function key label.

Using the operation mode “transmit” You can make direct entries and send via RS232. In both modes (“Function” and “Transmit”) can embed control characters. There are the control characters and available. In the keys furnished, you will find this relevant examples. By pressing the “Help” displays a help page. In the current version two help pages are present, they change at every access.


To run this app you need an additional hardware, you can create a DIY or refer to ready for use products at HMBTEC web store. The terminal provides TTL level that you possibly have to customize to your equipment. The terminal operates unidirectionally, i.e. it can only send data – not receive! For damage caused by the operation of DIY hardware the author assumes no responsibility. Always make sure that no voltage from outside is fed into the device (IP / IP)!


  • RS232 Terminal for direct connection Screenshot
  • RS232 Terminal for direct connection Screenshot

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