Chapter 10 Communication; Usb-Com Interface - Denso GT10Q-SU User Manual

Chapter 10 Communication

This scanner is compliant with USB 1.1 (Universal Serial Bus Specification Revision 1.1).

10.1 USB-COM interface

Installing the dedicated USB-COM device driver to the host computer allows the USB-COM interface to operate in
communications applications using the conventional serial port.
Notes for use
• In Windows 2000/XP, if you connect the scanner to your computer first time or have changed the COM port for
the scanner or hub, then confirm the COM port number on the Windows device manager or the like before use.
• Windows 98SE/Me will automatically assign the COM port number according to the OS specifications so that the
port number cannot be fixed. This may cause the COM port number to be changed at the time of next rebooting of
the host computer if (1) you have connected the scanner to the COM port first time or (2) you have changed the
configuration as given below:
- Changing the number of the scanner units connected to the COM ports
- Changing the COM port to which the scanner or hub is connected.
In such a case, reboot the host computer, open the device manager, and check the COM port number actually
assigned by OS before use.
• If you want to use two or more communications processors (software) or scanners concurrently on your computer,
be sure to assign a unique COM port number to each of them.
• If the host computer switches to the suspend mode when any communications software is running and recovers
from that suspend mode, the software may freeze in some computers. Quit and restart the software.
• It is not necessary to make settings such as transmission speed, data bits, parity, and stop bits (which are required
for communications software using a conventional serial port) since the USB interface ignores those settings. The
flow control should be set to "Hardware (RTS/CTS)" or "None."
• The virtual COM port on the computer and the scanner are connected with each other as shown below.
Computer
Communications protocol
You can select either non-acknowledge mode or ACK/NAK mode.
Non-acknowledge mode (default)
If the CTS signal is at a high level (Enable transmission), the scanner transmits code data read.
Note: The configuration software (ScannerSetting_2D) provides a choice of CTS timeout settings from 100 ms to 9.9
s in 100-ms increments and two CTS signal control choices Yes and No.
ACK/NAK mode
If the CTS signal is at high level (Enable transmission), the scanner transmits code data read. After that, the scanner
waits for and then processes a response. If the response is an ACK, the scanner normally ends the transmission; if it is
a NAK, the scanner transmits the code data again.
Note: The configuration software (ScannerSetting_2D) provides a choice of CTS timeout and ACK/NAK response
time settings each from 100 ms to 9.9 s in 100-ms increments.
TxD
RxD
RTS
CTS
DTR
DSR
DCD
Scanner
RxD
TxD
CTS
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