Xycom XVME-400, Руководство пользователя

Страница: 22 / 83

XVME-400/401/490/491 Manual
October, 1989
On the XVME-400/401, connector JKl carries the signals for Channels 0 and 2, while
connector JK2 carries the signals for Channels 1 and 3. On the XVME-490/491, the signals
for all four channels are carried on connector P2. All channels on all modules are
configured as DTE.
Sources of JKl /JK2. or P2 Connector
Output
Signals (one set for each serial channel)
TXD/SD SCC output pin TXD drives a line driver. Driver output is sent to this pin.
RTS/RS SCC output pin RTS* drives a line driver. Driver output is sent to this pin.
TXC/TT SCC output pin TRXC drives a line driver. Driver output is sent to this pin.
DTR/TR SCC output pin DTR* drives a line driver. Driver output is sent to this pin.
NOTE
The RS232C signal names (XVME-400/490) are given to the left of
t h e s l a s h , a n d t h e RS-485/422A signal names to the right
(XVME-40l/491).
All line drivers invert the signal. For modem control lines, writing a 1 to the appropriate
SCC writer register bit will cause the output to be asserted. For TXD/SD and TXC/TT,
the polarity defined by RS-232C or RS-485 is provided.
Destinations of JKl /JK2. or P2 Connector
Input
Signals (one set for each serial channel)
RXD/RD This input pin is buffered by a line receiver and is driven to the SCC input pin
RXD.
CTS/CS This input pin is buffered by a line receiver and is driven to the SCC input pin
CTS*.
RXC/RT This input pin is buffered by a line receiver and is driven to the SCC input pin
RTXC.
DCD/RR This input pin is buffered by a line receiver and is driven to the SCC input pin
DCD*.
All line receivers invert the signal. For modem control lines, a 1 will be read from the
appropriate SCC read control register bit when the input is asserted. For RXD/RD and
RXC/RT, the polarity defined by RS-232C or RS-485 is provided.
2-11