Measurement Computing Analyzer488 User Manual
Page 43
Section 2
Getting Started
2.21
View of the Analyzer488 Serial Connector
GND
-RXD
-TXD
CTS
RTS
5
1
9
6
DTR
-RxD
Receive Data - Input - Pin 2
This pin accepts serial data sent by the RS-232 host. The serial
data is expected with the word length, baud rate, stop bits and
parity selected by the internal switches. The signal level is low
true.
-TxD
Transmit Data - Output - Pin 3
This pin transmits serial data to the RS-232 host. The serial data
is sent with the word length, baud rate, stop bits and parity
selected by the internal switches. The signal level is low true.
DTR
Data Terminal Ready - Ouptut - Pin 4
The DTR output is connected directly to + 9 volts.
Gnd
Ground - Pin 5
This pin sets the ground reference point for the other RS-232
inputs and outputs.
RTS
Request To Send - Output - Pin 7
The RTS output is used as a hardware handshake line to prevent
the RS-232 host from transmitting serial data if the Analyzer488 is
not ready to accept it. When RTS/CTS handshake is selected, the
Analyzer488 will drive the RTS output high when there are greater
than 1000 character locations available in its internal buffer. If the
number of available locations drops to less than 1000, the
Analyzer488 will un-assert (low) this output. If XON/XOFF