
Manual Datafox ZK-MasterIV
Figure 28: Wiring of the Null modem adaptor
Pin
Designation
Importance
1
DCD data carrier detect
Träger erkannt
2
RxD receive data
Empfangsdaten
3
TxD transmit data
Sendedaten
4
DTR data terminal ready
DEE empfangsbereit
5
GND ground
Signalmasse
6
DSR data set ready
Betriebsbereitschaft
7
RTS request to send
Sendeanforderung
8
CTS clear to send
Sendebereitschaft
9
RI ring indicator
Ankommender Ruf
Table 4: PIN Belegung und Kennzeichnung
Abbrevia-
tion
Description
DCD
It becomes active when the connected modem has contacted another modem.
It indicates the PC that a connection is established and data can be sent.
DTR
The computer signals his ready status, e.g. at a direct connection.
DSR
As response to DTR (at crossed lines.)
RTS
Becomes active when the terminal is ready to send data.
CTS
Becomes active when the terminal is ready to receive data.
RI
Is produced by a connected modem when a ring comes in.
Table 5: Description of the identifiers of the Sub-d-9-pole
Output:
Low-Pegel = + 12V
High-Pegel = - 12V
Output current: up to 10 mA
Input:
Low-Pegel is recognized till ca. + 1V
High-Pegel is recognized from ca. + 1V
Driving point impedance = 10 kOhm
Version: 04.01.07.00
Page
36
www.datafox.de