Serial Port Header J18; Table 6-7. Serial I/O Header Pin Assignments - Motorola MBX Series Installation And Use Manual

Notes

Serial Port Header J18

A 10-pin header (J18 on MBX series boards) provides access to the EIA-
232 serial I/O interface. The pinouts are arranged to permit a direct ribbon
cable connection to a DB9 male connector. The pin assignments are listed
in the following table.

Table 6-7. Serial I/O Header Pin Assignments

DB9 Pin Header
(DTE) Pin
1 1
2 3
3 5
4 7
5 9
Note
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Table 6-6. Parallel I/O Header Pin Assignments
Pin # Signal
19 STBI#
21 BUSY
23 PERROR
25 SEL_OUT
1. AUTOFD#, INIT#, and SEL_IN# are not supported when
the MPC8xx port is used. They are supported when the
Peripheral I/O controller port is used.
2. BUSY, PERROR, and SEL_OUT are pulled down with
4.7KΩ resistors. All other control signals are pulled up with
4.7KΩ resistors.
Signal
DCD
RXD
TXD
DTR
GND
For SMC1, only TXD and RXD are supported.
Serial Port Header J18
Signal Pin #
GND
GND
GND
Key
Signal Header
Pin
DSR 2
RTS 4
CTS 6
RI 8
10
20
22
24
26
DB9 Pin
(DTE)
6
7
8
9
6-15
6