Dataprobe 8P-MAS Manuale operativo - Pagina 6
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INSTALLATION
Master and Switched Ports
Connection to the Switched A-H ports is made using 25 pin D Subminiature connectors on the rear of
the unit. The following leads are supported for Asynchronous communications:
Pin #
Designation
2
Transmit Data
3
Receive Data
4
Request to Send
5
Clear to Send
6
Data Set Ready
7
Signal Ground
8
Data Carrier Detect
20
Data Terminal Ready
The eight switched ports A-H are wired DCE (output
data on pin 3,RD). The Master port is wired for as DTE.
To directly connect a terminal device to the Master
Port, a Null cable is required. Refer to Figure 4 below.
RTS / DTR Selection
Jumpers JP1 through JP8 allows selection of RTS or DTR as the control lead used in the Lead Control
mode. To access these jumpers, disconnect the power source and remove the top cover of the 8P-
CAS by loosening the two screws on the underside of the unit. The jumpers are located as shown
below on Figure 3.
DTR
RTS
Typical
Port A-H
2 TD
3 RD
4 RTS
5 CTS
6 DSR
8 DCD
20
DTR
7 SG
RTS
Mon.
Figure 2
System Diagram
Electronic
4 Way
Switch
Code
Switch
Mon.
Control
Figure 3
Component Location
Page 6
Master
Port
2 TD
3 RD
4 RTS
5 CTS
6 DSR
8 DCD
20
DTR
7 SG