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PREPARATION FOR USE
2-37.
SERIAL I/O INTERFACE
The serial I/O interfaces on the iSBC 86/14/30 board at connector J2
provide EIA RS232C standard interfacing capability.
Connector J2 is a
13/26-pin connector providing an RS232C-compatible interface.
The ac
characteristics of the serial interface at connector J2 are contained in
Table 2-29.
Table 2-29 also lists the corresponding RS232C connector pin
numbers at which the same signal may be located.
Notice that the J2
connector may be used only as an RS232C interface.
2-38.
Serial I/O Cabling Requirements
The iSBC 86/14/30 board requires a serial I/O cable and connectors for
the J2 connector.
The configuration of the cable and connectors depends
on the type of interfacing application, however, an RS232C interface
requires a 26-pin edge connector, a 25-conductor flat cable, and a 25-pin
RS232C connector.
Table 2-30 lists some recommended types of cables and connectors that
maybe used for interfacing the serial I/O signals.
Any functionally and
electrically equivalent parts may be substituted.
When assembling the RS232C interface cable, ensure that pin-26 of the
edge connector is not connected to a conductor in the flat cable, and
ensure that pin 2 of the edge connector is connected to pin 1 of the J2
connector on the iSBC 86/14/30 board.
Refer to Figure 2-11 for RS232C
interface cabling diagram; refer to Figure 2-12 for edge connector pin
numbering information.
o
CONNECTOR PIN 1
Figure 2-11.
Serial Cabling Diagram
2-70
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