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36
APPENDIX C (CONTINUED)
Pin Assignments for the MCA951
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
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