ASIX UCAB232 Reference Manual - Page 8

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is being updated, drivers are kept updated, too.

Another way how to update drivers in Windows 7 is very

complicated or rather impossible.

2.2.2 Windows XP

Windows XP drivers are stable for a long time, thus there

is usually no reason for update them with the exception

that another software application using FTDI IC on the

same PC requires it. In that case, drivers are available for

download at

www.ftdichip.com

Troubleshooting and

2.3

Special Requirements

Some of applications have special requirements for

RS-232 communication, which demand particular correct

settings of the UCAB232 converter.

If there is any difficulty in communication between the

RS-232 connected device and PC try options listed below.

Red LED indicates transmitting, it can serve as a check on

that software application sends data to a correct PC port.

In other case, please check the COM port number in

software application and the assigned COM port number

by operating system.

The COM port number can be found and/or changed in

Control Panel/Device Manager/Ports.

If the RS-232 connected device does not reply (LED

indicator does not blink) although software application

sends data, it is possible that there is not correctly set

„Baud rate" (communication speed), „Data bits", „Parity",

„Stop bits" or „Flow control". Please check that the

settings meets specification of the RS-232 connected

device.

2.3.1 High demands on

time response

If the connected device replies (LED indicator blinks) but

software application still does not receive data it is

possible that the software application has high demands

on time response.

The way of communication through USB is very different

than communication through RS-232. USB uses packets

of 64 B size. Furthermore, a RS-232 device device can

receive only on PC request. Hence it is almost impossible

to assure time response lower than about 1 ms.

Time response settings can be done in Control Panel/

Device/Manager/Ports/.../Port Settings/ /Latency Timer. In

case of troubles set this number to 1 ms.

Fig.4: COM port Enhanced Settings

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