Specifications

Chapter 3 Hardware
ReadyBoard 800 Reference Manual 39
Pin # Pin #
DB9
Signal Description
B17 4 DTR4*
Data Terminal Ready 4 – Indicates serial port is powered, initialized, and
ready. Used as hardware handshake with DSR4 for overall readiness.
B18 9 NC Not connected (RI)
B19 5 GND Ground
B20 NC NC Not connected
Notes: The shaded area denotes power or ground. RS-232 signals are listed first followed by
RS-485/RS-422. The signals marked with * = Negative true logic.