Product Info

VTech proprietary and confidential
VTech Communications LTD.
R&D Department
The document is VTech’s proprietary information, Please do not disclose to third party without VTech’s consent
Ref. No.: 20191009 Version: 01 Date: 09 Oct, 2019 Page 8 of 33
PSKEY_UART_RX_PIO
PIO[0]
PSKEY_UART_TX_PIO
PIO[1]
PSKEY_UART_RTS_PIO
PIO[8] (default) or PIO[16]
PSKEY_UART_CTS_PIO
PIO[9] (default) or PIO[17]
Figure 5-1 shows the 4 signals that implement the UART function.
Figure 5-1 Universal asynchronous receiver
When VTBM-A01 BT Module is connected to another digital device, UART_RX and UART_TX transfer data
between the 2 devices. The remaining 2 signals, UART_CTS and UART_RTS, implement optional RS232 hardware
flow control where both are active low indicators.
UART configuration parameters, such as baud rate and packet format, are set via using the VTBM-A01 BT Module
firmware.
NOTE To communicate with the UART at its maximum data rate using a standard PC, the PC requires an
accelerated serial port adapter card.The use of UART and USB are mutually exclusive.
Table 5-2 Possible UART settings
Parameter
Possible values
Baud rate
Minimum
1200 baud (≤ 2% Error)
9600 baud (≤ 1% Error)
Maximum
4 M baud (≤ 1% Error)
Flow control
RTS/CTS or None