30
8.remote communication
You will learn the following:
Introduction of RS-232 interface
RS-232 connection.
Select baud rate.
Software protocol.
The instrument uses RS-232 interface (standard configuration) to communicate with the
computer to complete all the functions of the instrument. Through the standard SCPI
command, users can easily compile various collection systems suitable for themselves.
8.1 RS-232C
RS-232 is a widely used serial communication standard, also known as asynchronous
serial communication standard, used to achieve data communication between computers
and computers, computers and peripherals.RS is abbreviation of “Recommended
Standard” (recommended standard)
，
232 is the standard number, which was officially
published by the American Electronics Industry Association (EIA) in 1969. It provides for
one data line at a time.
Most serial port configurations are usually not strictly based on the RS-232 standard:
25-core connectors are used at each port (computers today basically use 9-core
connectors). The most commonly used RS-232 signals are shown in the table:
Table- 8 commonly used RS - 232 signals
signal
Symbol
Pin number of 25 core
connector
Pin number of 9
core connector
Request to send
RTS
4
7
Scavenging sending
CTS
5
8
Data setup preparation
DSR
6
6
Data carrier detection
DCD
8
1
Data terminal preparation
DTR
20
4
send data
TXD
2
3
