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Signal levels
Signal designations
Pin layouts
December 2001
The signals are both transmitted and received as differential voltage.
A positive differential voltage corresponds to logic zero (OFF).
A negative differential voltage corresponds to logic one (ON).
V
= 2 V and V
= 5 V
dmin
dmax
The control unit detects the differential voltages between V
V
= 6 V as a logically defined level.
dmax
The following signals are transmitted as differential signals:
Signals
Data signals
Control and message signals
The protective ground connects the transmitter and receiver housings.
GND is the differential voltage reference conductor.
These signals perform the same functions as those on the RS-232-C/V.24
interface.
The logic unit and adapter block have the same pin layout.
TNC Data Interfaces
Signal designation
TXD, TXD
RTS, RTS
DSR, DSR
= 0.2 and
dmin
RXD, RXD
CTS, CTS
DTR, DTR
8 – 13
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