Mesa 4I33, Руководство пользователя

Страница: 9 / 12

4I33 6
CONNECTORS
PARALLEL CONNECTOR
P2 is the parallel connector. P2 is a 26 pin .1" header that provides access to
the 4I33s 82C55 based 24 bit parallel I/O. The 26 pin connector uses the ISO
standard pinout.The parallel connector pinout is as follows:
PIN FUNCTION PIN FUNCTION PIN FUNCTION PIN FUNCTION
1 PA0 2 VCC 3 PA1 4 PA2
5 PA3 6 PA4 7 PA5 8 PA6
9 PA7 10 PB0 11 PB1 12 PB2
13 PB3 14 PB4 15 PB5 16 PB6
17 PB7 18 PC0 19 PC1 20 PC2
21 PC3 22 PC4 23 PC5 24 PC6
25 PC7 26 GND
AUI CONNECTOR
P4 is AUI connector. P4 is a 16 pin connector. When P4 is terminated with a 15
pin female IDC DSUB connector (with cable conductor pin unused), that connector will
have the standard Ethernet AUI pinout. P4 gets its +12 volt transceiver power from
the PC/104 bus so +12V must be supplied if using and external transceiver. It is
suggested that the cable connecting P4 to the DSUB female connector be 12 inches
or shorter in length, as the flat cable creates an impedance mis-match.
P4 is also used for connecting to MESA’s MAU external BNC adapter. This
adapter gets its isolated transceiver power from the 4I33s on card DC-DC converter,
and so does not r12V on the PC/104 bus.