ST2523 Series Operation Manual Ver1.2
30
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 ST2523 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 a serial interface for communication.
The connection of the instrument with a PC is shown in figure 6-1.
TXD(2) (3) RXD
PC
(Controller) RXD(3) (2) TXD ST2523
GND(5) (5) GND
Figure 6-1 Connection of the instrument with a PC
Figure 6-1 shows that the serial interface pin definition of this instrument is different from that of 9 pin
connector used in computer. Users 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 2kB.
For result data formats transmitted to a PC from the instrument, see Commands Reference.
Signal
Code
Connector Pin Number
Transmitted Data
TXD
2
Received Data
RXD
3
Signal Ground Common
GND
5
