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6. Functional Description
The BISM2 Bluetooth module is a
The variety of interfaces and the AT command set allow the BISM2 module to be used for a wide number of short range wireless applications, from simple cable replacement to complex multipoint applications, where multiple radio links are active at the same time.
The complexity and flexibility of configuration are made simple for the design engineer by the integration of a extremely comprehensive set of AT commands, supplemented with a range of “S” registers which are used for
To provide the widest scope for integration a range of different physical host interfaces are provided:
6.1Interfaces
6.1.1UART interface
UART_TX, UART_RX, UART_RTS and UART_CTS form a conventional asynchronous serial data port with handshaking. The interface is designed to operate correctly when connected to other UART devices such as the 16550A. The signalling levels are nominal 0V and 3.3V and are inverted with respect to the signalling on an RS232 cable. The interface is programmable over a variety of bit rates; no, even or odd parity; stop bit and hardware flow control. The default condition on
By writing different values to the relevant S register the UART_RI can be continuously polled to detect incoming communication. The UART_RI signal serves to indicate incoming calls.
UART_DSR is an active low input. It should be connected to DTR output of the host. When the module is running in high speed mode (See definition for S Reg 507), this pin should be asserted by the host to ensure connection is maintained. A
The module communicates with the customer application using the following signals:
Port /TXD @ application sends data to the module’s UART_RX signal line
Port /RXD @ application receives data from the module’s UART_TX signal line
UART Interface
Serial Module
UART_TX UART_RX UART_CTS UART_RTS UART_DSR UART_DTR UART_RI UART_DCD
Application
/RXD |
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/TXD |
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/RTS |
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| RS232 | |
/CTS |
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/DTR |
| Interface |
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/DSR |
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/RING |
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/DCD |
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Figure 6.1 : UART interfaces
Note that the serial module output is at 3.3V CMOS logic levels. Level conversion must be added to interface with an