RS-232 CONTROL
Connectingthe RS-232 Port
46 SuperView3000 User Manual May9, 2002
A
echo” is made with the ECHO command. If the SuperViewis connectedto a
computerconfigured as Data Communications Equipment (D.C.E.), you need
touse a null modem. See “The Null Modem” on page 48.
Almostall ASCII terminals, and most computer serial ports, are configured as
D.T.E.To connect these to SuperView,you need a “straight-through” cable with
pins1 through 8 connected. “Straight-through” implies that pin 1 is connected
top in 1, pin 2 to pin 2, and so on (Figure 12). The cable will have a 9-pin male
plug on SuperView’send, and t he appropriate gender of a 9-pin connector on
theo ther end. Most ASCII terminals and host computers have a 9-pin female
connector for their RS-232 port.
Theserial cable can be up to 50 feet long for regular cable, or substantially
longerfor low capacitance cable. Depending on the signals used, one or more of
theco nductors internal to the cable may not be needed.
PINOUT
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DESCRIPTION
The9-pin D-Sub connector is configured as Data Communications Equipment
(D.C.E.)with the followingsignals:
Asseen in Figure 12, the pins are numbered from top to bottom, right to left.
So,looking at the connector, pin #1 is located in the upper right corner, andpin
#9 isin the lower left corner.
FIGURE12. 9-pinD-Sub RS-232 Female Connector
TABLE7. RS-232 Serial Port Pinout
D-Sub9-pin Circuit Description
1 CD CarrierDetect
2 TD TransmitData
3 RD ReceivedData
4 (notconnected)
5 AB SignalGround(commonreturn)
6 DSR DataSet Ready
7CTSCleartoSend
8 RTS Request to Send
9 (notconnected)
5
96
1