Datafox ZK-MasterIV Manual page 36

Manual Datafox ZK-MasterIV
Figure 28: Wiring of the Null modem adaptor
Pin Designation
1 DCD data carrier detect
2 RxD receive data
3 TxD transmit data
4 DTR data terminal ready
5 GND ground
6 DSR data set ready
7 RTS request to send
8 CTS clear to send
9 RI ring indicator
Table 4: PIN Belegung und Kennzeichnung
Abbrevia- Description
tion
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
Importance
Träger erkannt
Empfangsdaten
Sendedaten
DEE empfangsbereit
Signalmasse
Betriebsbereitschaft
Sendeanforderung
Sendebereitschaft
Ankommender Ruf
Page 36
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