User guide

Chapter 3 Hardware
36 Reference Manual Express-IBR
System Fan
Table 3-7 lists the pin signals of the System Fan interface, which provides a 3-pin, single-row header with
0.049" (1.25mm) pitch.
Note: The shaded table cell denotes power or ground.
Serial Console
The Express-IBR supports the serial console (or console redirection) feature. This I/O function is provided
by an ANSI-compatible serial terminal, or the equivalent terminal emulation software running on another
system. This can be very useful when setting up the BIOS on a production line for systems that are not
connected to a keyboard and display.
Serial Console Setup
The serial console feature is implemented by connecting a standard null modem cable or a modified serial
cable (or “Hot Cable”) between one of the serial ports on the baseboard, such as COM 1, and the serial
terminal or a PC with communications software. The BIOS Setup Utility controls the serial console settings
on the Express-IBR. Refer to Chapter 4, BIOS Setup for the settings of the serial console option, the serial
terminal, or PC with communications software, and the connection procedure.
Hot (Serial) Cable
To convert a standard serial cable to a Hot Cable, certain pins must be shorted together at the serial port
(DB9) connector. For example, short together pins 7 (RTS) and 9 (RI) on COM port 1 (DB9) connector as
shown in Figure 3-1.
Figure 3-1. Hot Cable Jumper
Table 3-7. Optional System Fan (FAN1)
Pin # Signal Description
1 HWM_PWM2 Modulation – This signal controls the fan speed
2
VCC +5.0/12.0 volts DC +/- 5%
3
HWM_TACH2 Fan Tachometer – This signal monitors the fan speed
Standard DB9 Serial
Port Connector (Female)
Rear View
5
4
3
2
1
9
8
7
6
Express-IBR_hotcable