Tonghui TH2523/A - Remote Control; RS232 C Communication

TH2523 Series Operation Manual Ver1.2
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Chapter 6 Remote Control
6.1 RS232C Connection
RS-232 standard, also called as asynchronous serial communication standard, has already been
widely used for data communication between computers, computer and external equipment.
RS is the English abbreviation of Recommended Standard; 232, the standard number. This
standard is issued by EIA in 1969, which rules to send one bit in a data line every time.
As most serial interfaces, the serial interface of TH2523 is also not strictly based on RS-232
standard but only uses the smallest subset of this standard. The signals are listed in the
following table.
Table 6-1 RS-232 Signal and Pin Connector
The reason is that the use of three lines is much more inexpensive and much simpler than that
of five lines or six lines, which is the biggest advantage of using serial interface for
communication.
The connection of the instrument with PC is shown in figure 6-1.
TXD(2) (3) RXD
PC
（Controller） RXD(3) (2) TXD TH2523
GND(5) (5) GND
Figure 6-1 Connection of the instrument with PC
Signal
Code
Connector Pin Number
Transmitted Data
TXD
2
Received Data
RXD
3
Signal Ground Common
GND
5