Metrologic MS6720 Installation And User Manual page 39

Pin Assignments for the MCA951 (DEC9S)
Located on the MCA is a 9-pin female D-type connector 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)
Pin Function
1 OCIA Shield Ground
2 RDATA
3 RDATA Return
4 Clock Out
5 Power/Signal Ground
6 Clock Out Return
7 Clock In Return
8 Clock In
*9 +5VDC Power to Scanner
Version "14" (232)
Pin Function
1 Shield Ground
2 RS-232 Transmit Output
3 RS-232 Receiver Input
4 Data Terminal Ready Input
5 Power/Signal Ground
6 Data Set Ready Output
7 Clear to Send Input
8 Request to Send Output
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 Scanner Installation: Powered by
External Power Supply page 5).
Version "11" (46XX)
Pin Function
1 Shield Ground
2 RS-232 Transmit Output
3 RS-232 Receiver Input
4 IBM 4680 -B
5 Power/Signal Ground
6 IBM 4680 +A
7 Clear to Send Input
8 Request to Send Output
*9 +5VDC Power to Scanner
Version "15" (LTPN)
Function Pin
1 Shield Ground
2 RS-232 Transmit Output
3 RS-232 Receive Input
4 Light Pen Source (
+5V Input)
5 Power/Signal Ground
6 Light Pen Data (Output)
7 Clear to Send (Input)
8 Request to Send (Output)
*9 +5VDC Power to Scanner
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