Hardware Description
SYS68K/CPU-30 R4 Technical Reference Manual
Page 66
3.9.7
RS-422/RS-485
Hardware
Configuration
of Serial Ports
It is possible to configure any or all of the four serial ports to be RS-422
compatible or – as factory option – RS-485 compatible. By default, all
four serial ports are configured for RS-232 operation. For proper RS-
422/485 operation, the correct driver/receiver hybrid module must be
installed (FH-003), and the serial interface switches must be properly
configured.
SEE ALSO: For a list of the serial interface switches on the CPU board,
please refer to Section 3.9.6, ‘RS-232 Configuration of Serial Ports,’ on
page 63.
The RS-422 compatible interface supports TXD, RXD, RTS, CTS with
differential outputs and inputs. Each port occupies the same nine pins of
the D-Sub connector as in the RS-232 compatible configuration, but with
a different signal association.
When a serial port is configured for RS-422 operation, its I/O signals will
be connected to the front panel DB-9 connector as follows (ports #1, #2
and #3 only):
When serial port #4 is properly configured for RS-422 operation, its I/O
signals will be connected to the VME P2 connector as follows:
Signal
Input
Output
9-pin D-Sub
Connector
Description
TXD-
RTS-
CTS+
RXD+
RXD-
TXD+
RTS+
CTS-
GND-
x
x
x
x
x
x
x
x
1
2
3
4
5
6
7
8
9
Transmit Data
Request to Send
Clear to Send
Receive Data
Receive Data
Transmit Data
Request to Send
Clear to Send
Signal GND
Signal
Input
Output
VME
Connector P2
Description
TXD-
RTS-
CTS+
RXD+
RXD-
TXD+
RTS+
CTS-
x
x
x
x
x
x
x
x
C29
C30
C31
C32
A32
A29
A30
A31
Transmit Data
Request to Send
Clear to Send
Receive Data
Receive Data
Transmit Data
Request to Send
Clear to Send
☞
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