AVL-75 User Manual
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TTW-AVL75-UM001
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3.6.
UART Interface
There is one UART interface on AVL-75. UART is used for configuration and firmware downloading, and
communicating with external devices like CAN Bus module and RFID reader.
Please note the UART interfaces are all RS232 level. For RS232 level, valid signals are 3V to 15V and -3V
to -15V and the -3V to +3V is not a valid level. 3V to 15V correspond with logic 0 of TTL level, while -3V
to -15V correspond with logic 1.
The examples of connections of UART with female DB-9 and with external devices are showed as
follows.
Figure 7.
The Connection of UART with Female DB-9
Figure 8.
The Connection of UART with External Devices
