Amplicon Serial Communications device driver Support

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What is the driver ?

Configuring RS485 Half Duplex turn round

Setting unusual baud rates with Visual Basic

For more information e-mail Helen Elcock

What is the driver

The Amplicon serial communications drivers are based on the Microsoft serial commuincations drivers. However they have been extended to support Amplicon specific card features, namely

Shared Interrupts

Automatic RS485 toggling in half duplex mode

Configuring RTS Half Duplex Toggle

There are two ways of commuinicating using RS485. In full duplex mode (four wire), two wires are used to send data and two two recieve data. In half duplex mode (two wire) two wires share both send and recieve data. In order for this to work, RS485 transmit buffers must only be enabled when the device is transmitting.

The driver can be configured through the control panel to only enable the RS485 transmit buffers when required.

Custom control panel applications / user interfaces are provided for Windows that have an option in the advance settings for the RS485 turn around mode.

No user program code is needed to use these functions, just enable them in the control panel and existing RS232 applications will work on two wire RS485.

The NT control panel applet is shown below