BV4103

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IASI - BV4103 LCD Display

The Intelligent Asynchronous Serial Interface (IASI) is a common standard that makes it much easier to control and use hardware from either a standard communication interface (terminal) or a microcontroller. It is based on a very simple text command set and a flexible hardware interface. The ‘Intelligent’ aspect is derived from the fact that each particular IASI knows about the connected hardware so a simple command can make the hardware perform a reasonably complex function. Scroll text on an LCD display for example.

Contained within this html page are scripts that will work in conjunction with the IASI devices, the big advantage of using IASI is that they can be connected directly to the RS232 COM port if there is one on the PC and more than one device can be connected to the same port because the devices can be configured with their own address.

Because VBScript is used then an IE (Microsoft) compatible browser is required. VBscript can also be made to run stand alone and within Microsoft applications such as Excel and Word. The script in this file should run with little modification.

	Open COM Port
	When the 'OpenPort' button is pressed, it will open the port and send 3 CR to establish a Baud rate on success "IASI Connected" is displayed in the text box. Should any errors occur look at the bottom left of the browser for this and double click on it, this will indicate what the error is and where it occurred. Open COM Port Com Port Number 1-5: Port Settings: Status NOTE: If the status is inverted only a limited number of commands will work. It is better to configure the device for normal un-inverted operation, the status for this will read 'Okay'

IASI System (Z) Commands

The next section is common to all I2C BV devices and can be used to interrogate the EEPROM and change the address etc. You will see that address 0 of the EEPROM is the device address. The blue form below contains most of the Z commands that are applicable to all IASI devices. On the left hand side are the configuration slots, 5 and 6 can be modified and set with the set button but be warned that if the invert flag is set to N then communication will cease unless a converter is used.

To create a macro simply put in the commands and separate with a comma. The script will take care of presenting them to the IASI device and checking that there is enough space.

IASI System Command

This form sets the Z commands for IASI

BV4103 16 x 2 LCD display

The BV4103 is an integrated IASI and 16 x 2 LCD display. The module, which is the same as a BV4108 is connected to the back of the display. The picture shows how the connection is made including a suitable power source. The white cable goes of to an RS232 connector and is attached to the PC.

The pin connections and wiring diagram are shown in the table below. NOTE that an IASI module can operate in two modes. 1) When connected directly to the RS232 as shown in the table below and 2) when connected to a microcontroller or to a PC through a converter. The scripts in this file will work with whatever the IASI module is configured to but the connections must reflect the mode. This is because there is only one output pin from the IASI device and this pin can sent inverted signals for RS232 or non-inverted signals for use with a microcontroller or PC with a converter. The scripts look for the '>' in the prompt, if the signal is inverted when it shouldn't be or vice versa then the '>' will not be visible and the scripts will fail.

RS232 9 Pin	LCD
Pin 2	Pin 2
Pin 3	Pin 4
Pin 5	Pin 5
Short pins 1,6,4
Short pins 7 and 8

	BV4103 Form - Controlling the LCD Display
	LCD Specific IASI