ST2515 Operation Manual
42
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 ST2515 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 ST2515
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. 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. For each transmission, the maximum receivable length of SCPI command string is 2kB.
Signal
Code
Connector Pin Number
Transmitted Data
TXD
2
Received Data
RXD
3
Signal Ground Common
GND
5
