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Suggestion：
1.
2. To avoid damge the device, do not short circuit output terminal or the chassis.
5.3 Connect to Computer
Refer to Figure 5-2，the pin definition of the UTR2810E is different from the pin definition of the 9 core connector used
by computer. User can use dual-core shielded wire to made three-wire connecting cable (length should less than 1.5m)
as shown in the picture or buy the serial port cable of UTR2810E from Uni-trend company. When self-made cable
connecting to the computer, pay attention to the right connecting, the computer side should short circuit with 4, 6 pin,
7, 8 pin.
5.4 Serial Port Parameter
Serial port parameter of UTR2810E see Table 5-3：
TransmissionMode
Baud Rate
Data Bit
Stop Bit
Parity Bit
End Character
Connector
5.5 Key Points of Programming
Because UTR2810E does not use hardware communication, and RS232C serial communication is simple to use.
Therefore reduce the possible data loss or data error phenomenn, communication software should be compiled
strictly comply with the following requirements:
1） The host computer transmit command by ASCII code with NL (newline character, ASCII code is 10) as the
end character. UTR2810E will perform the command when received the end character.
2） Once UTR2810E perform inquiry command, the query result will be sent immediately, regardless of whether
the current command string has been executed completely. Therefore, a command string can inquire
multiple times, but the host computer should have a corresponding number of read result operation. This
protocol is recommends that a command string only contain one query.
To avoid electrical shock, turn off the power supply when removing or inserting the
connector.
Figure 5-2 Instrument connect with Computer
Full duplex asynchronous communication with start and stop bit
9600 bps
8 bit
1 bit
None
NL（line character，ASCII code 10）
DB9 core
Table 5-3 Serial Port Parameter
UTR2810E Series LCR Meter – User Manual
27
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