Serial Ports
8-13
NOTE.
The EIA-232C specification defines a maximum rate of 20,000 bits per
second over a typical 50-foot cable (2,500 picofarads maximum load
capacitance). Higher baud rates are possible, but depend specifically
upon the application, cable length, and overall signal quality.
8.3.4 Connectors and Cabling
The Ultra I/O Controller provides two standard EIA-232 serial I/O ports. Serial
Port A is available at the BajaPPC-750 front panel P4 connector (standard con-
figuration only) and at the VMEbus P2 connector (optional configuration).
Table 8-7 lists the pinouts for the front panel connector. A console adapter (Fig. 8-
2) also is available for this connector, providing connectivity with a standard
DB25 connector. Table 6-10 lists the pinouts for the VMEbus connector. Please
refer to Table 8-1 for a summary of the port connector configurations.
NOTE.
This connector (P4) is not installed for the optional (Motorola-com-
patible) P2 configuration.
Figure 8-1. Serial Port-A Connector (P4, RJ45)
Table 8-7. Serial Port-A Pin Assignments (P4 RJ45 or Console Adapter)
RJ45 Pin#
(P4)
DB25 Pin#
(Adapter)
Signal
RJ45 Pin#
(P4)
DB25 Pin#
(Adapter)
Signal
1
8
no connection
5
7
GND
2
3
TXD_A*
6
6
RTS_A
3
2
RXD_A*
7
4
DCD_A
4
20
CTS_A
8
5
DTR_A
1
8
Содержание BajaPPC-750
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