User's Manual

RS-232 CONTROL

Connecting the RS-232 Port

46 SuperView 3000 User Manual May 9, 2002

echo” is made with the ECHO command. If the SuperView is connected to a

computer configured as Data Communications Equipment (D.C.E.), you need

to use a null modem. See “The Null Modem” on page 48.

Almost all 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

pins 1 through 8 connected. “Straight-through” implies that pin 1 is connected

to pin 1, pin 2 to pin 2, and so on (Figure 12). 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.

The serial cable can 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.

PINOUT

............

DESCRIPTION

The 9-pin D-Sub connector is configured as Data Communications Equipment

(D.C.E.) with the following signals:

As seen 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, and pin

#9 is in the lower left corner.

FIGURE 12. 9-pin D-Sub RS-232 Female Connector

TABLE 7. RS-232 Serial Port Pinout

D-Sub 9-pin Circuit Description

1 CD Carrier Detect

2 TD Transmit Data

3 RD Received Data

4 (not connected)

5 AB SignalGround(commonreturn)

6 DSR Data Set Ready

7CTSCleartoSend

8 RTS Request to Send

9 (not connected)