B. Making Your Own Cable
B-4 UniSite-xpi User Manual
Pin Functions When In
DTE Mode The following table explains the function of the pins on the Terminal and
Remote ports when connected to DTE equipment.
Pin Signal Description
1 Ground Provides a safety ground connection.
2 Receive Data Carries the received data from the DTE
device to the programmer.
3 Transmit Data Carries the transmitted data from the
programmer to the DTE device.
4 Request to Send This line is held high by the programmer.
5 Clear to Send A high on this line from the programmer
means that it is ready to receive data.
(Used for hardware handshaking.)
6 Data Set Ready This line is held high when the
programmer is ready to transfer data.
7 Signal Ground Provides a reference ground for all signals
on the cable.
8 Data Carrier This line is held high by the programmer.
9-19 No Connection
20
*
* If this line is not connected, the programmer will consider it high and will function
normally.
Data Terminal A high on this line enables the
programmer to transmit data. (Used for
hardware handshaking.) A low inhibits
data transmission from the programmer.
21-25 No Connection
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