Chapter 3 |
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| Pin # | Signal | DB9 # | Description |
| 4 | RTS* | 7 | Request To Send – Indicates serial port is ready to transmit data. Used |
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| as hardware handshake with CTS for low level flow control. |
| 5 | TXD | 3 | Transmit Data – Serial port transmit data output is typically held to a |
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| logic 1 when no data is being sent. Typically, a logic 0 (On) must be |
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| present on RTS, CTS, DSR, and DTR before data can be transmitted on |
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| this line. |
| 6 | CTS* | 8 | Clear To Send – Indicator to serial port that external serial |
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| communications device is ready to receive data. Used as hardware |
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| handshake with RTS for low level flow control. |
| 7 | DTR* | 4 | Data Terminal Ready – Indicates serial port is powered, initialized, and |
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| ready. Used as hardware handshake with DSR for overall readiness to |
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| communicate. |
| 8 | RI* | 9 | Ring Indicator – Indicator to serial port that external modem is detecting |
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| a ring condition. Used by software to initiate operations to answer and |
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| open the communications channel. |
| 9 | GND | 5 | Digital Ground |
| 10 | Key/NC | NC | Key Pin – Not connected |
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Notes: The shaded area denotes power or ground. The signals marked with * indicate active low.
USB Port (J10)
The CoreModule 420 contains one root USB (Universal Serial Bus) hub and one functional USB port. The USB function is provided by the STPC ATLAS CPU (U14). Features implemented in the USB port include the following:
•One root hub with one USB port
•USB v.1.1 and Universal OHCI v.1.0 compatible
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•Supports a fuse (F1, 1.5A) for over current protection
Table
Pin # | Signal | Description |
1 | USBPWR | USB Power – Vcc power |
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| disabled if this input is low. |
2 | USBPN | USB Port Data Negative. |
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3 | USBPP | USB Port Data Positive |
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4 | GND | USB Port ground |
5 | SHIELD | USB Port shield |
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Notes: The shaded area denotes power or ground.
CoreModule 420 | Reference Manual | 35 |
