
8.1 ST5540/ST5541 Remote Interface Overview (USB connection)
140
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
Summary of Contents for ST5540
Page 2: ......
Page 6: ...Contents iv Index i ...
Page 29: ...23 2 Chapter 2 Instrument Labels and Screens Instrument Labels and Screens Chapter 2 ...
Page 80: ...4 8 Changing the Measurement Method Auto Manual 74 ...
Page 121: ...115 8 9 7 Chapter 7 Instrument System Settings Instrument System Settings Chapter 7 ...
Page 144: ...7 14 Setting the Backlight 138 ...
Page 284: ...10 14 Measurement Networks 278 ...
Page 290: ...11 4 Instrument Disposal 284 ...
Page 320: ...Appendix4 External Dimensions A30 ...
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