User's Manual

RS-232 CONTROL
Connecting the RS-232 Port
May 9, 2002 SuperView 3000 User Manual 47
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RS-232
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PARAMETERS
Ensure that your device is set up with these default serial port parameters.
Ensure that the controlling host computer or ASCII terminal is set for 9600
baud, 8 data bits, 1 start bit, 1 stop bit and no parity. These are the default serial
port parameters. The baud rate and handshake settings can be changed.
Ensure that the Echo/No Echo mode is set appropriately. Transmitted Data is
considered an input, and Received Data is considered an output because these
signals are named from the perspective of the Data Terminal Equipment
(D.T.E.) to which the D.C.E. will normally be connected. Transmitted Data is
the signal which communicates commands from the host computer RS-232
port, or the ASCII terminal, to the SuperView. Received Data is the signal that
returns status, parameter values and, if the SuperView is being controlled by an
ASCII terminal, echoes the commands.
Request to Send is a handshaking signal generated by the Data Terminal
Equipment. It is always asserted.
Clear to Send is a signal generated by the Data Communications Equipment
in response to the Data Terminal Equipment’s assertion of Request to Send.It
indicates that the Data Communication Equipment has recognized the Request
to Send and is not busy (i.e. it is ready to receive data). Clear to Send is always
asserted.
Data Set Ready is a signal generated by the Data Communications
Equipment, normally to indicate it has power. It is used by the Data Terminal
Equipment to verify that the cable is connected, that there is Data
Communications Equipment on the other end of the cable and that the
equipment is switched on. Data Set Ready is always asserted.
Received Line Signal Detector (sometimes known as Data Carrier Detect)
is a signal generated by the Data Communications Equipment. Received Line
Signal Detector is always asserted.
TABLE 8. RS-232 Parameters
Duplex: Full
Baud rate: 9600 (default setting)
Data bits: 8
Start bit: 1
Stop bit: 1
Parity: no parity
Physical: 9-pin D-Sub connector (female)
Configuration: D.C.E.
Handshake: X-On / X-Off