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Appendix B I/O Interface Board
CoreModule 800 QuickStart Guide 25
J4
Pin #
Signal Pin # On-
board
Description
14 RTS1* J7-16
Request To Send 1 – Indicates serial port is ready to transmit data. Used
as hardware handshake with CTS1 for low level flow control.
15 TXD1
(through
JP1)
J7-12 Transmit Data 1 Output – This line is typically held to a logic 1 when
no data is being sent. A logic 0 (On) must be present on RTS1, CTS1,
DSR1, and DTR1 before transmitting data on this line.
16 CTS1* J7-17 Clear To Send 1 – Indicates external serial device is ready to receive
data. Used as hardware handshake with RTS1 for low level flow
control.
17 DTR1* J7-13
Data Terminal Ready 1 – Indicates port is powered, initialized, and
ready. Used as hardware handshake with DSR1 for overall readiness to
communicate.
18 RI1* J7-18
Ring Indicator 1 – Indicates external serial device is detecting a ring
condition. Used by software to initiate operations to answer and open
the communications channel.
19 GND J7-14 Digital Ground
20 S1_TXD JP1-3 Serial Port 2 Transmit TTL – Places TTL TX signals on pin 3 of the
Serial Port 2 (J4) when jumper (JP1) on I/O Board is set to pins 2-3.
21 USBOC0 J4-21
USB 0 Over Current – The Power Distribution Switch (U1) monitors
power and disables port if this input is low.
22 USB Pwr J4-22 USB Port 0 power (+5V +/-5%)
23 USBP0- J4-23 Universal Serial Bus Port 0 Data Negative
24 USBP0+ J4-24 Universal Serial Bus Port 0 Data Positive
25 GND J4-25 USB Ground
26 USBOC1 J4-26
USB 1 Over Current – The Power Distribution Switch (U1) monitors
power and disables port if this input is low.
27 USB Pwr J4-27 USB Port 0 power (+5V +/-5%)
28 USBP1- J4-28 Universal Serial Bus Port 1 Data Negative
29 USBP1+ J4-29 Universal Serial Bus Port 1 Data Positive
30 GND J4-30 USB Ground
31 MSDT J4-31 Mouse Data
32 MSCK J4-32 Mouse Clock
33 GND J4-33 Ground
34 MSPwr J4-34 Mouse Power (+5V +/-5%)
35 HDDAct D1-1 IDE Hard Disk Drive Activity – IDE activity signal to HDD Activity
LED (D1).
36 ExtSMI* J6-2 External SMI – Provides external SMI signal to the CoreModule 800.
37 ThermDP U3-3 Thermal Data Positive – Thermal data positive received from CPU.
38 BatLow* J6-3 Battery Low –
39 ThermDN U3-4 Thermal Data Negative – Thermal data negative received from CPU.
40 NC J4-40 Not Connected (External –5V input)
Notes: The shaded area denotes power or ground. The signals marked with * = Negative true logic.
NC = Not Connected at CoreModule 800.