Olivetti ECR 7900 Service Manual page 78

5.DeviceClass specification
Comply with USB device class's communication device class A
Please refer to "USB Class Definition for Communication Devices Version 1.1" of the USB
society issue for a detailed specification.
6. of use
Restriction
This driver emulates the RS232C operation by the USB connection.
The following usage restrictions are generated under the WindowsAPI environment.
1) COMSTAT structure
Neither fXoffHold nor fDsrHold are detected automatically. Please note that this function cannot
be used by the application. Please correspond by the following content when using it.
#1 fXoffHold...Please examine receive data from the device by the application, and judge
#2 fDsrHold・・・Please use GetCommModemStatus API.Sample is follows.
//C language sample source
DWORD ModemStat;
GetCommModemStatus(hCom, &ModemStat);
if(ModemStat & MS_DSR_ON)
{
//DSR signal is on.(Device is not busy)
}
else
{
//DSR signal is off.(Device is busy)
}
2) Virtual COM(RS232C) port
Please do not turn off the power supply of the device and do not pull out the USB cable
while having opened virtual COM port by the application. After that, the port might not
be able to be used until the personal computer is rebooted.
72
the Xon/Xoff character directly.
ECR 7900 Service Manual
bstract Control Model spec.
Y108540-8