![](/images/new-backgrounds/1205902/20590257x1.webp)
Appendix B |
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| I/O Interface Board | |
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| J4 | Signal | Pin # On- | Description |
| Pin # |
| board |
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| 14 | RTS1* | Request To Send 1 – Indicates serial port is ready to transmit data. Used | |
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| as hardware handshake with CTS1 for low level flow control. |
| 15 | TXD1 | Transmit Data 1 Output – This line is typically held to a logic 1 when | |
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| (through |
| no data is being sent. A logic 0 (On) must be present on RTS1, CTS1, |
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| JP1) |
| DSR1, and DTR1 before transmitting data on this line. |
| 16 | CTS1* | Clear To Send 1 – Indicates external serial device is ready to receive | |
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| data. Used as hardware handshake with RTS1 for low level flow |
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| control. |
| 17 | DTR1* | Data Terminal Ready 1 – Indicates port is powered, initialized, and | |
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| ready. Used as hardware handshake with DSR1 for overall readiness to |
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| communicate. |
| 18 | RI1* | Ring Indicator 1 – Indicates external serial device is detecting a ring | |
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| condition. Used by software to initiate operations to answer and open |
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| the communications channel. |
| 19 | GND | Digital Ground | |
| 20 | S1_TXD | Serial Port 2 Transmit TTL – Places TTL TX signals on pin 3 of the | |
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| Serial Port 2 (J4) when jumper (JP1) on I/O Board is set to pins |
| 21 | USBOC0 | USB 0 Over Current – The Power Distribution Switch (U1) monitors | |
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| power and disables port if this input is low. |
| 22 | USB Pwr | USB Port 0 power (+5V | |
| 23 | USBP0- | Universal Serial Bus Port 0 Data Negative | |
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| 24 | USBP0+ | Universal Serial Bus Port 0 Data Positive | |
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| 25 | GND | USB Ground | |
| 26 | USBOC1 | USB 1 Over Current – The Power Distribution Switch (U1) monitors | |
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| power and disables port if this input is low. |
| 27 | USB Pwr | USB Port 0 power (+5V | |
| 28 | USBP1- | Universal Serial Bus Port 1 Data Negative | |
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| 29 | USBP1+ | Universal Serial Bus Port 1 Data Positive | |
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| 30 | GND | USB Ground | |
| 31 | MSDT | Mouse Data | |
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| 32 | MSCK | Mouse Clock | |
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| 33 | GND | Ground | |
| 34 | MSPwr | Mouse Power (+5V | |
| 35 | HDDAct | IDE Hard Disk Drive Activity – IDE activity signal to HDD Activity | |
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| LED (D1). |
| 36 | ExtSMI* | External SMI – Provides external SMI signal to the CoreModule 800. | |
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| 37 | ThermDP | Thermal Data Positive – Thermal data positive received from CPU. | |
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| 38 | BatLow* | Battery Low – | |
| 39 | ThermDN | Thermal Data Negative – Thermal data negative received from CPU. | |
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| 40 | NC | Not Connected (External | |
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Notes: The shaded area denotes power or ground. The signals marked with * = Negative true logic. NC = Not Connected at CoreModule 800.
CoreModule 800 | QuickStart Guide | 25 |