Ampro Corporation 420 - Manual (Page 41)

Chapter 3 Hardware
CoreModule 420 Reference Manual 35
Pin # Signal DB9 # Description
4 RTS* 7 Request To Send – Indicates serial port is ready to transmit data. Used
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
logic 1 when no data is being sent. Typically, a logic 0 (On) must be
present on RTS, CTS, DSR, and DTR before data can be transmitted on
this line.
6 CTS* 8 Clear To Send – Indicates external serial device is ready to receive
data. Used as hardware handshake with RTS for low level flow control.
7 DTR* 4 Data Terminal Ready – Indicates serial port is powered, initialized, and
ready. Used as hardware handshake with DSR for overall readiness.
8 RI* 9 Ring Indicator – Indicates external serial device is detecting a ring
condition. Used by software to initiate operations to answer and open
the communications channel.
9 GND 5 Ground
10 Key/NC NC Key Pin – Not connected
Notes: The shaded area denotes power or ground. The signals marked with * indicate active low.
USB Interface (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:
• Provides one root hub with one USB port
• Supports USB v.1.1 and Universal OHCI v.1.0
• Over-current detection status is provided by STPC ATLAS CPU (pin D21)
• Provides a fuse (F1, 1.5A) onboard for over current protection
Table 3-14. USB Interface Pin/Signal Designations (J10)
Pin # Signal Description
1 USBPWR USB Power – Vcc (+5V +/-5%) power goes to the port through an
onboard fuse. Port is disabled if this input is low.
2 USBPN USB Port Data Negative.
3 USBPP USB Port Data Positive
4 GND USB Port ground
5 SHIELD USB Port shield
Note: The shaded area denotes power or ground.