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KeyVerter® converts key stroke events from any PS/2 keyboard (small DIN connector) into an  RS-232 and TTL serial output stream.  Keyboard enable your favorite microcontroller like Parallax's BASIC Stamp 2 using only one 9600 baud serial input pin.


  • Dimensions: 2.7" x 1.825" x .6"
  • Weight: 0.9 oz.
  • Input voltage: 7.5 to 12.0 volts DC (17 ma @ 9 volts without keyboard attached)
  • Operating temperature: -10 C to +70 C
  • RS-232 output: 9600 baud, 8 data bits, 1 stop bit, no parity, inverted
  • TTL output: 9600 baud, 8 data bits, 1 stop bit, no parity, inverted


Pad/Connector Hookup To
DC IN Power supply +7 to +12 volts
GND Power supply ground
RS-232 OUT Microcontroller RS-232 serial input (Female DB-9 pin 2)
GND Microcontroller  RS-232 ground (Female DB-9 pin 5)
TTL OUT Microcontroller TTL serial input
GND Microcontroller  TTL ground
J1 PS/2 keyboard

Configuration and Operation:

KeyVerter® has two modes of reporting key stroke information.  These modes are selected via the JMP1 jumper.

Jumper State
  • Removed: Normal mode
  • Installed: Extended mode

Normal Mode - One byte is sent per key stroke (see figure 1.0)
For example when the user types "Yes" <enter> then 4 bytes: 59 hex, 65 hex, 73 hex, and 0D hex are sent out the TTL and RS-232 port.
Extended Mode - Two bytes are sent per each key stroke, the Shift/Ctrl/Alt state (see figure 2.0) followed by the key stroke value (see figure 1.0)
For example when the user presses the left Control, left Alt, and Delete keys 2 bytes: D4 hex and 83 hex are sent out the TTL and RS-232 ports. 
Programming code samples are available at Any terminal program, such as HyperTerminal, can be used to demonstrate KeyVerter® functionality.

KeyVerter® Keyboard Mapping Chart:

KeyVerter® Extended Keyboard Mapping Chart:

Warranty & Service:

If the product fails to perform as described in our product description or specification, within 90 days from the date of shipment to the buyer, we will repair or replace the product and/or accessories originally supplied. Failure due to improper installation, misuse, abuse or accident is not covered by this warranty. Incidental and consequential damages are not covered by this warranty.The buyer must obtain a Return Material Authorization by calling (248) 588-4400, and shipping the defective product to Intuitive Circuits, 3928 Wardlow Ct., Troy, MI 48083, freight prepaid. After the warranty expires, we will promptly supply an estimate for the repair cost.