Hioki ST5540 - ST5540;ST5541 Remote Interface Overview (USB Connection)

8.1 ST5540/ST5541 Remote Interface Overview (USB connection)
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Figure 1 shows a block diagram of the ST5540/ST5541 remote interface.
Operating
principle
Communication between a personal computer and the is virtual RS-232 serial
communication. While the USB interface is installed as the transmission route,
actual communication uses RS-232.
It is necessary to issue RS-232 commands via the virtual COM port.
When RS-232 commands are issued to the virtual COM port, commands are
sent to the in the following order. (For the receipt of data, the order is reversed.)
8.1 ST5540/ST5541 Remote Interface Over-
view (USB connection)
USB signal
Virtual COM
((Virtual RS-232C) port
USB RS-232
conversion application
USB A connector
Central processing unit (CPU)
USB  RS-232
conversion device
USB B connector
USB signal
USB device driver
Communication terminal
software or application software
RS-232
compatibility signal
USB cable
Baud ratem :9600bps (fixed)
Data bit : 8bit (fixed)
Parity : none (fixed)
Stop bit : 1 (fixed)
Flow control :none (fixed)
ST5540/ST5541
Personal Computer (PC)
Figure 1: Overview block diagram of the remote interface
(PC internal) Virtual COM port
(Communication signal via RS-232)
(PC internal) USB  RS-232 data conversion
USB
( internal) USB  RS-232 conversion device
( internal) CPU(Communication signal via RS-232)
Sending a command
Receiving data