Users Manual

6.21.1 RS-232 interface
The RS-232 transceiver MB1262/U12 supply is 3V3. The RS-232 interface is connected to the
STM32MP157xAA3 UART4 that is shared exclusively with the USB micro-B/ST-LINK v2-1 VCP as described in
Table 32.
Table 32. HW configuration for the RS-232 interface
Jumpers IO Setting
Configuration
(1)
MB1263/JP4 UART4_TX
JP4[1-2] connected to RS232 CN12
JP4[2-3] Connected to ST-Link V2-1 VCP RX
MB1263/JP5 UART4_RX
JP5[1-2] connected to RS232 CN12
JP5[2-3] Connected to ST-Link V2-1 VCP TX
1. Default configuration in bold
Figure 18. HW configuration for the RS-232 interface
Figure 19. RS-232 connector pinout MB1262/CN12
Table 33 RS-232 connector pinout MB1262/CN12
Table 33. RS-232 connector pinout MB1262/CN12
Board function
Pin Pin Board function
NC 1 6 DSR
RXD 2 7 NC
TXD 3 8 CTS
UM2535
RS-232 port
UM2535 - Rev 2
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