GENISYS II System Hardware Installation
UNION SWITCH & SIGNAL
SM-6900B Rev. 0.0
August 1999
3-7
performance, interconnecting cables should not contain extra wires. Extra wires should be
connected to COM at both ends for best noise immunity. Note that COM cannot be connected to
frame or earth ground as it is directly connected to GENISYS II logic common. The cable shield
should be connected to frame ground at one end of the cable only. If CTS is not used, it must
be forced to its unasserted state. To permanently force an input to its unasserted state, the input
should be connected to -12V. To force an input to its asserted state, the input should be connected
to +12V.
RS-423 ports may be connected to RS-232 ports by strapping COM and RXCOM terminals
together on the RS-423 end and connecting signals as described under the RS-232 connection
scheme below.
3.2.5 Connecting to RS-232 Serial Ports
Serial port 4 is the RS-232 serial port: it supports TXD and RTS output signals, and RXD and DCD
input signals. Each RS-232 signal is transported by a single wire and is referenced to signal
common (COM). When any RS-232 signal is not asserted, the voltage level for that signal is
between –3 and –15 volts. (For data lines TXD and RXD, the quiescent or unasserted state is the
MARK state.) The asserted state for all signals is b3 and +15 volts. RS-232 ports should be
interconnected using only multi-conductor cable with an over-all shield. The cable should not
contain any twisted pairs. The serial port signal commons (COM) should be interconnected using
one of the conductors in the cable (NOT the shield). For best performance, interconnecting cables
should not contain extra wires. Extra wires should be connected to COM at both ends for best noise
immunity. If connected, the cable shield should be connected to frame ground at one end of the
cable only. The length of interconnecting cables should be limited to 50 feet or less. If it is necessary
to permanently force an input to its unasserted state, the input should be connected to -12V. To
force an input to its asserted state, the input should be connected to +12V.
Summary of Contents for GENISYS II
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