The KB232 Manual

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KB232 - Excerpts from Customer Support

Question: Whenever I press a "Caps Lock" or "Num Lock" key, the keyboard stops working. (Application is powering the keyboard and adapter from the RS-232 connection.)
Answer: The current to power the indicator lights exceeds the power that can be extracted from the RS-232 port. You can either disable the indicator LEDs by changing the configuration string, or you can use an external power supply to power the KB232.

Question: Can you recommend a power supply for the KB232 adapter and a keyboard?
Answer: Try a Digi-Key part number T403-PIP-ND. It's a 9V wall mount supply made by CUI Inc. Last price I saw was $5.08 for 0ne piece.

Question: What signals does the KB232 adapter use?
Answer: The RS-232 signnals used are Receive (pin 2), Transmit (pin 3) and Ground (pin 5). The KB232 derives power from the DTR (pin 4) input and CTS (pin 7) input. All other lines are not connected.

Question: The key code "83" used for the F7 key doesn't seem to work when loaded in the key code table.
Answer: There was a misprint in the KB232 manual. The key code for the F7 key is "F0".

Question: I can't load the entire configuration string. It returns to the prompt before I'm done.
Answer: Versions before 3.0x7 have a problem that the input buffer is set too short. You can work around this by using abbreviated settings. Fo example, instead of using "Simple,9600,No Par,nc,2,20", use "S,96,N,nc,2,20". We can upgrade the program version if this is a problem.

Question: At 1200 baud, the "C" command to display the configuration string does not work.
Answer: Versions before 3.0x7 have this problem. The recommended work-around is to use 9600 baud to set up the key code lookup table. Then change the configuration to 1200 baud once you're done. We can upgrade the program version if this is a problem.

Question: It's very awkward to have to erase the whole key code lookup table when you make a mistake.
Answer: We have a macro script for Tera Term to download a keycode table from a file on your PC. The macros are online at ftp://ftp.L3sys.com/pub/kb232_tera_term_macros.zip. The Tera Term application is available at: http://hp.vector.co.jp/authors/VA002416/teraterm.html.

Question: Can you make the KB232 send serial ASCII for the CAPS-LOCK and NUM-LOCK keys?
Answer: Yes. You can assign ASCII to these keys in the key code table. The CAPS-LOCK key code is "58" and the NUM-LOCK key code is 77. These we're originally left out of the manual, but have since been added.

Question: When I plug the KB232 with the keyboard into the RS-232 port, I cannot communicate with it using Hyperterm or Tera Term. Using a breakoutbox, I can see data going to the adapter but nothing coming back.
Answer: Have you tried connecting it to a COM port without a keyboard attached? You should be able to press "Enter" on Hyperterm and get a prompt back. The KB232 will plug directly into a COM port. I don't suggest using a breakout box as it can suck power away from the control lines for the LEDs and not allow enough power to power the KB232.

The keyboard you are using may draw more power than can be obtained from the RS232 signals. If you are using a notebook computer, often these computers don't provide true RS-232 signals and don't provide adequate power. The Belkin Model F8E223 keyboard that we re-sell is particularly low powered and may staisfy your needs. Failing that, you may need to use a +9V or +12V DC power supply. (See above.)