Ampro Corporation Single Board Computer 700 User Manual
Page 48
Chapter 3
Hardware
42
Reference Manual
ReadyBoard 700
Pin #
Pin #
DB9
Signal
Description
B16
8
CTS4*
RX4+
Clear To Send 4 – Indicates external serial communications device is
ready to receive data. Used as hardware handshake with RTS4 for low
level flow control.
RX4+ – If in RS485 or RS422 mode, this pin is Receive Data 4 +.
B17
4
DTR4*
Data Terminal Ready 4 – Indicator Serial port 4 is powered, initialized,
and ready. Used as hardware handshake with DSR4 for overall
readiness to communicate.
B18
9
NC
Not connected
B19
5
GND
Ground
B20
NC
NC
Not connected
Notes: The shaded area denotes power or ground. RS232 signals are listed first followed by
RS485/RS422. The signals marked with * = Negative true logic.