ST2683A Operation Manual Ver.1.3
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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 ST2683A 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 ST2683A series
GND(5) (5) GND
Figure 6-1 Connection of the instrument with PC
Figure 6-1 shows that the serial interface pin definition of this instrument is different from that of
9 pin connector used in the computer. User can purchase the serial interface cable from our
company.
RS232 interface characterizes with a baud rate ranging from 9600 to 115200, no parity, 8-bit data
bit, 1-bit stop bit.
The instrument commands comply with the SCPI standard. When a command string is transmitted
to the instrument, it is required to send LF (hexadecimal: 0AH) as the terminating character. Each
time the maximum receivable number of SPCI command string is 2kByte.
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