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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.
J2
Pin
Description
1
Ground
In the RS-232C environment, this line provides a safety frame ground for
RS-232 equipment.
2
Transmit Data (Output)
This line transfers data to the RS-232C device.
3
Receive Data (Input)
This line accepts data input from the RS-232C device.
4
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.
5
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.
6
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.
7
Signal Ground
This line provides a common signal connection.
8
Carrier
2
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
6