NETkom ES75 - Page 22

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Interface description
Purpose of the connectors/connections
Signal
name
PIN I/O Description Parameters
DCD 1 O The functions
correspond to
those of a serial
interface on the
basis of a V.24
protocol.
active high > 5 V
low < –5 V
RXD 2 O logical 1 = low < –5 V
logical 0 = high >
+5 V
TXD 3 I active high > 2.4 V
low < 1.8 V
DTR 4 I active high > 2.4 V
low < 1.8 V
GND 5 0 V
DSR 6 O active high > 5V
low < –5 V
RTS 7 I active high > 2.4 V
low < 1.8 V
CTS 8 O active high > 5 V
low < –5 V
RI 9 O active high > 5 V
low < –5 V
Use and operation
In order to control the modem and transfer
data, the customer application (e.g. host
computer) is connected via the RS232
cable.