GV75MG User Manual
All outputs are internally pulled up to PWR pin by a diode, so no external flyback diode is needed
when the output is connected to an inductive load.
5.7.
UART Interface
There is one UART interface on GV75MG. UART is used for configuration and firmware upgrade.
Please note that the UART interfaces are all of RS232 level. For RS232, valid signal levels are 3V
to 15V and -3V to -15V, and the -3V to +3V is not a valid level. 3V to 15V corresponds to logic 0 of
RS232 level, while -3V to -15V corresponds to logic 1.
The examples of connections of UART with female DB-9 and with external devices are shown as
follows.
Figure 11.
Connection of UART with Female DB-9
Figure 12.
Connection of UART with External Devices
QSZTRACGV75MGUM0101 10
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