USB232U/485Ui
Page 3
1.3.1 Enhanced Features
The USB232U supports data rates up to 920k Baud. The USB485Ui supports data rates up to
3M Baud. There is a 384 byte receive FIFO buffer and 128 byte transmit FIFO buffer
associated with each port. This allows the processor to service the ports in a timely manner
over the USB bus.
If you have an RS485 Half Duplex or Multi-drop application. There is a link selectable Half-
Duplex mode. In this mode, the RS485 transmit buffer is enabled automatically by the UART,
whenever data is waiting to be sent in the UART Transmit buffer. This feature makes efficient
multi-drop communication simple to implement by removing the burden of the Transmit buffer
enable control from the software.
1.4 What the Package Contains
The package as delivered from Amplicon Liveline Ltd contains:
1. The USB serial interface as ordered, in a protective bag. The model will be one of the
following, and is identified by the type number printed on the PCB.
USB232U USB to RS232 Serial Communications Controller
USB485Ui USB to RS422/485 Serial Communications Controller with I/O signal
isolation
2. The included distribution software and this manual on CD
3. Any additional accessories (mating connectors, software etc.) may be packed separately.
1.4.1 The Amplicon Warranty Covering the USB232U/485Ui interfaces
This product is covered by the warranty as detailed in the Terms and Conditions stated in the
current domestic or international Amplicon Liveline Ltd catalogue and at our website at
http://www.amplicon.co.uk.
1.4.2 Contacting Amplicon Liveline Limited for Technical Support or Service
The USB Series of interfaces are designed and manufactured by Amplicon Liveline Ltd and
maintenance is available throughout the supported life of the product.
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