Westinghouse 1X00024H01 WH1-2FF imported DCS system module
Technical data of product parameters
The EIA-232-D standard was originally developed by the Bell 1X00024H01 WH1-2FF
System to connect terminals via modems. Several handshaking
lines were included for that purpose. Although handshaking is
unnecessary in many applications, the lines themselves remain part
of many designs because they facilitate troubleshooting.
Table A-1 lists the standard EIA-232-D interconnections. To 1X00024H01 WH1-2FF
interpret this information correctly, remember that EIA-232-D was
intended to connect a terminal to a modem. When computers are
connected to each other without modems, one of them must be
configured as a terminal (data terminal equipment: DTE) and the
other as a modem (data circuit-terminating equipment: DCE). Since
computers are normally configured to work with terminals, they
are said to be configured as a modem in most cases. 1X00024H01 WH1-2FF
Signal levels must lie between +3 and +15 volts for a high level, and
between -3 and -15 volts for a low level. Connecting units in parallel
may produce out-of-range voltages and is contrary to EIA-232-D
specificationsOne set of handshaking signals frequently implemented are RTS 1X00024H01 WH1-2FF
and CTS. CTS is used in many systems to inhibit transmission until
the signal is high. In the modem application, RTS is turned around
and returned as CTS after 150 microseconds.1X00024H01 WH1-2FF is programmable
in some systems to work with the older type 202 modem (half
duplex). CTS is used in some systems to provide flow control to
avoid buffer overflow. This is not possible if modems are used. It is usually necessary to make CTS high by connecting it to RTS or to some source of +12 volts such as the resistors shown in Figure A-1.
CTS is also frequently jumpered to an MC1488 gate which has its
inputs grounded (the gate is provided for this purpose).
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reminder
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