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RS-232 CONTROL
Connecting the RS-232 Port
48 SuperView 3000 User Manual May 9, 2002
A
Almost all ASCII terminals, and most computer serial ports, are configured as
Data Terminal Equipment. To connect these to the SuperView, you need a
“straight through” cable with pins 1 through 8 connected. “Straight through”
implies that pin 2 is connected to pin 2, etc. The cable will have a 9-pin male
plug on SuperView’s end, and the appropriate gender of a 9-pin connector on
the other end. Most ASCII terminals and host computers have a 9-pin female
connector for their RS-232 port. This cable may be up to 50 feet long for regular
cable, or substantially longer for low capacitance cable. Depending on the
signals used, one or more of the conductors internal to the cable may not be
needed.
THE NULL
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MODEM
You may need to connect the SuperView’s serial port to a host computer
configured as Data Communications Equipment. This is done using a null
modem. The net effect of a null modem is to reverse the Transmitted Data and
Received Data connections. Also, the Request to Send and Clear to Send
connections are reversed. This may be done by using a special “null modem”
cable, or by inserting a small “null modem” box or cable in series with a regular
“straight through” cable.