there is a 9-pin female d-type connector, located on the mca, used to connect the mca to the host device. the output signals on the 9-pin host end of the mca are dependent upon which version of the scanner that is being used. the following is a list of the pin assignments for the different versions:

    version "9" (ocia)↑*** version "11" (46xx)

    pin function pin function

    1↑** ocia shield ground 1↑** shield ground

    2 rdata 2 rs-232 transmit output

    3 rdata return 3 rs-232 receiver input

    4 clock out 4 ibm 4680 -b

    5 power/signal ground 5 power/signal ground

    6 clock out return 6 ibm 4680 +a

    7 clock in return 7 clear to send input

    8 clock in 8 request to send output

    9↑* +5vdc power to scanner 9↑* +5vdc power to scanner

    version "14" (232) version "15" (ltpn)

    pin function pin function

    1↑** shield ground 1↑** shield ground

    2 rs-232 transmit output 2 rs-232 transmit output

    3 rs-232 receiver input 3 rs-232 receive input

    4 data terminal ready input 4 light pen source (+5v input)

    5 power/signal ground 5 power/signal ground

    6 data set ready output 6 light pen data (output)

    7 clear to send input 7 clear to send (input)

    8 request to send output 8 request to send (output)

    9↑* +5vdc power to scanner 9↑* +5vdc power to scanner

    *when the host supplies power to the scanner, this is the pin assignment for the +5vdc for the scanner. if, in the application, the host device will supply the power necessary for the scanner, reposition an internal jumper within the mca and plug the 4 position ground jumper to the power supply connector for fcc and esd purposes. (refer to ms6720 installation: powered by external power supply page 5)

    **pin 1 of the mca provides a connection point for various ground/shield ground configurations on different metrologic products. internal jumper jp2 of the mca gives end users the option of changing pin 1 of the db9 into a no connect (nc). simply remove the jumper from the pins, then pin 1 of the db9 becomes an open/no connect pin.

    ***jp2 should always be in place for ocia applications