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DATA-LINC GROUPp

LCM100 User’s Guide

Appendix A

RS-232 Connector Pin Assignments

Both modules of the LCM100 have female DB-25 connectors which can be directly connected to

DTE and DCE equipment. All output levels are a minimum of +6 volts when active and a

maximum of –6 volts when inactive, measured in a 3k ohm load. Inputs will sink 10Ma and have

a typical turn-on threshold of +1.25 volts and a turn-off threshold of +0.8 volts.

Description

Ground

In the RS-232C environment, this line provides a safety frame ground for

RS-232 equipment.

Transmit Data (Output)

This line transfers data to the RS-232C device.

Receive Data (Input)

This line accepts data input from the RS-232C device.

Request to Send

Request to send output; indicates that the terminal is ready to transmit data.

This line is enabled, pulled up to +12 volts through a 4.7K ohm resistor.

Clear to Send

Clear to Send input; acknowledges that the terminal may begin

transmission. This line is enabled, pulled up to +12 volts through a 4.7K ohm

resistor.

Data Set Ready

Data Set Ready input; acknowledges that the remote device is on and

operational. This line is enabled, pulled up to +12 volts through a 4.7K ohm

resistor.

Signal Ground

This line provides a common signal connection.

Carrier

Detect (Output)

This line is a high level (+12 VDC) when carrier is detected, and a low level

(-12 VDC) when carrier is not detected.

PN 161-09998-001A

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Omron LCM100 Manual de usuario Pagina 7