Chapter 9: Breakout Board
RS-232 / UART Data Pins
136
Psion Teklogix Omnii HDK User Manual
To configure the data pins on the breakout board for a serial device connected to the RS-232 DE9
connector (J30), set the following jumpers as indicated:
Figure 9.15 RS-232 Jumper Headers and Pin Order
The RS-232 standard male DE9 serial connector (J30) has the following pinout:
Table 9.7 RS-232 / UART Jumper Settings
Jumper Pins
Function
J16
1-2
UART_TXD & RS-232_TXD
/ SPI_INT & GPIO_0
J17
1-2
UART_RXD & RS-232_RXD
/ GPIO_1
J18
1-2
UART_CTS & RS-232_CTS
/ GPIO_2
J19
1-2
UART_RTS & RS-232_RTS
/ GPIO_3
J20
2-3
UART_TXD /
RS-232_TXD
J21
2-3
UART_CTS /
RS-232_CTS
J22
2-3
UART_RXD /
RS-232_RXD
J23
2-3
UART_RTS /
RS-232_RTS
Table 9.8 Modem Signal Jumper Settings
Jumper Pins
Function
J24
2-3
SPI_MOSI /
RS-232 RI & GPIO_4
J25
2-3
SPI_MISO /
RS-232_DCD & GPIO_5
J26
2-3
SPI_SCLK /
RS-232_DSR & GPIO_6
J27
2-3
SPI_CS_N /
RS-232_DTR & GPIO_7
J43
2-3
GPIO_4 /
RS-232_RI
J44
2-3
GPIO_5 /
RS-232_DCD
J45
2-3
GPIO_6 /
RS-232_DSR
J46
2-3
GPIO_7 /
RS-232_DTR
Table 9.9 RS-232 Header J30 Pinout
Pin
Name
Description
1
DCD
Data Carrier Detect
2
RXD
Received Data
2
1
3
2
1
3
2
1
3
2
1
3
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