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Chapter 3
Connector and Cabling
©
National Instruments Corporation
3-3
NI-FBUS Hardware and Software User Manual
Figure 3-3 shows J1, the Fieldbus connector pinout.
Figure 3-3.
Fieldbus Connector Pinout
Figure 3-4 shows J2, the screw terminal block pinout.
Figure 3-4.
Screw Terminal Block Pinout
The pinout of the PCMCIA-FBUS uses pins 6 and 7 of the J1 connector
for the Fieldbus signals as specified in the
Fieldbus Standard for Use in
Industrial Control Systems, Part 2, ISA-S50.02.1992
. Pins 2 and 4 of the
J2 screw terminal block provide an alternate connection to the Fieldbus.
However, the screw terminal block is not an independent link.
All of the signals on the screw terminal block provide a direct connection
to the 9-pin D-SUB. National Instruments provides the Power+ and Power–
connections as passive connections from the D-SUB to the screw terminal.
The PCMCIA-FBUS itself does not supply power to, or draw power from,
these pins.
No Connection
No Connection
No Connection
No Connection
No Connection
Power –
Power +
Data –
Data +
1
3
25
4
7
6
8
9
1
2
3
4
5
Power –
Data –
Shield
Data +
Power +