15
Figure 9
– SW3 and L2
4.7. Serial Communication
The UEPM Development Board uses two UART ports of the MSP430 and one SPI port.
The two UART ports of the MSP430 are USCI0 and USCI1 and are respectively called
on the UEPM Development Board UART1 and UART2.
The SPI port is directly connected to the micro-SD Slot. An additional interruptible input
SD_CD is used to detect when a micro-SD card is inserted into the slot.
The UART1 can be used with any XBee footprint compatible module, an INNOVASUB
pressure sensor or an underwater communication module (provided optionally).
However, only 1 device can be used at the same time. The Jumper JP9 is used to
select which device is to be used with UART1.
To use XBEE1 with UART1, REMOVE FIRST the jumpers from the positions UART1
and SNS1, and finally place three jumpers on XBEE1 on JP9. In order to use the
INNOVASUB pressure sensor 1, remove first all the jumpers from JP9 and place two
jumpers on the position SNS1. In order to use the underwater communication module,
remove all the jumpers from JP9 and place three jumpers on the position UART1.
When using XBEE1, CTS and RTS pins are directly wired to the MSP430 if high baud
rates needed.
The UART2 can be used with a Xbee footprint compatible module or an INNOVASUB
pressure sensor. However, only 1 device can be used at the same time. The Jumper
JP10 is used to select which device to use with UART2.
To use XBEE2 with UART2, REMOVE FIRST the jumpers from the position SNS2, and
finally place three jumpers on XBEE2 on JP10. In order to use the INNOVASUB
pressure sensor 2, remove first all the jumpers from JP10 and place two jumpers on the
position SNS2.
