Metrologic Instruments MLPN 2178 manual Appendix C, Pin Function

Appendix C

Pin Assignments

Versions “1” and “21” Pin Assignments for RS-232, OCIA and Light Pen Emulation

The version “1” and “21” scanners head cables are terminated with a male 25-pin D-type connector. To connect the scanner to the host device, may require a communication cable. The communication cable may include a connection for a transformer or it may be designed to draw power directly from the host device. This item can be ordered at the same time scanner is purchased.

The version “1” and “21” scanners are designed to be used for RS-232, OCIA or Light Pen Emulation communication.

The following is a list of the pin assignments. The pin numbers are impressed on the head cable’s connector.

Pin	Function
1	AC Shield Ground
2	RS-232 Receive Input
3	RS-232 Transmit Output
4	CTS Input
5	RTS Output
6	Reserved
7	Signal Ground
8 - 12	Reserved
13	Earth Ground
14	Power Ground 1
15	Light Pen Source
16	Light Pen Data
17	OCIA Clock In Return
18	OCIA Clock In
19	Power (11 - 30 volts) DC
20	DTR Input
21	OCIA Clock Out
22	OCIA Clock Out Return
23	OCIA RDATA
24	OCIA RDATA Return
25	Power Ground 2

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