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CT 9000 © ADV
3-14
Auxiliary VO Interface
The auxiliary VO interface provides the RS-422 interface between
: an external device and the CPU board. U4 pin 1 is used to trans-
late the serial communications transmitted from the CPU board to
the external device to RS-422 levels.
U13 pin 3 is used to translate
RS-422 serial communications from the external device to the CPU
board.
An RS-232 device can be connected to this port by connecting the
minus output of U4 (U4 pin 3) to the external device receive line.
The auxiliary YO connector pinout is shown in Table 3-3.
Table 3-3. Auxiliary I/O Connector Pinout
J5 | Signal Name
Pin
1
Not Used
2
Not Used
3
RCV-
4
GND
5
TXD-
6
RCV+
7
Not Used
8
TXD+
800961-C. Nov. 2000
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