Phytec phyCORE-i.MX31, Hardware Manual

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The phyCORE-i.MX on the Development Board
13.5.3.2 UART3 (P1A)
UART3 provides only two handshake signals: RTS and CTS. Figure 20 below shows the signal mapping
of the RS-232 level signals to connector P1A.
1 - NC
6 - NC
2 - TXD
7 - RTS
3 - RXD
8 - CTS
4 - NC
9 - NC
5 - GND
Figure 20: UART3 connector P1A signal description
Caution:
It should be noted that the standard phyCORE-i.MX31 module provides the UART3 signals
x_CTS_RS232, x_RTS_RS232, x_RXD_RS232, and x_TDX_RS232 at RS-232 levels. Configuration
jumpers on the module allow for TTL levels at these signals instead. If you have ordered a module with
this configuration you should remember that the signals at P1A will be at TTL levels and not RS-232
levels. In this configuration damage will occur if connected to an RS-232 level interface such as a PC.
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PHYTEC Messtechnik GmbH 2007 L-700e_0
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