Rs232 Serial Interface; Introduction Of Rs-232C Interface; Utr2810E Serial Interface - UNI-T UTR2810E Series User Manual

5. RS232 Serial Interface

In this chapter you will learn the following：
 Introduction of RS-232 interface
 UTR2810E serial interface
 Connect to computer
 Serial port parameter
 Key points of programming
The instrument uses an RS-232 interface (standard) to communicate with the computer for all instrument functions. Through
standard SCPI commands, user can also easily compile a variety of acquisition systems suitable for their own.

5.1 Introduction of RS-232C Interface

RS-232 is the widely used serial communication standard, it's also called asynchronous serial communication standard.
RS-232 is used to realize data communication between computers and peripherals. RS is an abbreviation for
"Recommended Standard", 232 is the standard number, this is a standard officially published by EIA in 1969, which
stipulates that one data line is transmitted one at a time.
The configuration of most serial ports is usually not strictly based on the RS-232 standard: 25 core connector are used on
each port (the current computer is basically use 9 core connector). The common RS-232 signal table see Table 5-1.
Signal
Request to Send
Clear to Send
Data Set Ready
Data Carrier Detection
Data Terminal Ready
Transmitted Data
Received Data
GND

5.2 UTR2810E Serial Interface

Serial ports of UTR2810E is not strictly based on the RS-232 standard，it's just provide a smallest simplified subset, see
Table 5-2.
Signal
Transmitted Data
Received Data
GND
RS232C connector uses 9 core pin DB socket，sequence of pin see Figure 5-1
Symbol Pin number of 25 core
RTS
CTS
DSR
DCD
DTR
TXD
RXD
GND
Table 5-1 RS-232 Common Signal
Symbol
TXD
RXD
GND
Table 5-2 UTR2810E Serial Signal
Figure 5-1 Back View of RS232C Connector
26
UTR2810E Series LCR Meter – User Manual
Pin number of 9 core
connector connector
4
5
6
8
20
2
3
7
Pin number of 9 core connector
3
2
5
7
8
6
1
4
3
2
5