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SDA 601 Serial Digital Analyzer
straight-through—a simple ribbon cable may be adequate. Use a null modem
cable (which swaps the lines between pins 2 and 3 and pins 7 and 8) to commu-
nicate with another DCE device. Figures 2- -3 and 2- -4 illustrate cable wiring for
communicating with a device that has a 25-pin serial connector.
Because of space limitations on the connector end of the SDA601, you may
have to insert a 9-pin adapter between the cable and the connector. If the cable
has a female end, use a male/male adapter such as ITT Cannon p/n 111805- -1.
Table 2- 1: RS-232 Connector Pin Assignments
764 DB9 Pin
1
Not connected
2
RXD (Received Data)
3
TXD (Transmitted Data)
4
Not connected
5
Signal Ground
6
Not connected
7
RTS (Request to Send)
8
CTS (Clear to Send)
9
Not connected
NOTE. RS-232 signals are named from the perspective of the DTE device. Since
the SDA601 is a DCE device, pin 2 ("Received Data") is an output from the
instrument; that is, the data is received by the connected DTE device.
Figure 2- 3: Connecting to a DTE Device with a DB25 Serial Port
Signal Name
Operating Information
Signal Direction
—
From SDA601
To SDA601
—
—
—
To SDA601
From SDA601
—
2- 5
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