Owner`s manual

Page A-9Serial, Parallel, UPS and Ethernet Connector Configurations
RS-232 RJ-45 TO DB-25 CABLES FOR TERMINALS AND PRINTERS
The following table shows the signal-to-pin orientation of each of the Eagle 550’s four
on-board serial I/O connectors. Note that this particular cable uses an RJ-45 to RJ-45
patch cord, and a DB-25 connector adapter to interface the terminal or printer. The
AM-359 serial I/O paddle cards can use the same identical cable when required.
RS-232 RJ-45 to DB-25 Connector Signals
Computer End RJ-45
Patch Cord
Terminal or Printer
DB-25 Adapter
SIGNAL PIN# DIRECTION PIN# DIRECTION PIN# SIGNAL
RXD 5 <----- 5 <----- 2 TXD
RTS 4 -----> 4 -----> 5 CTS
TXD 3 -----> 3 -----> 3 RXD
DTR 6 -----> 6 -----> 8 DCD
CTS 2 <----- 2 <----- 20 DTR
GND 7 <----- 7 <----- 7 GND
DCD 8 <----- 8 <----- 4 RTS
Shld GND 1 <----- 1 <----- 1 Shld GND
The patch cords should be internally twisted-pair cable with RJ-45 connectors on both
ends. The pin assignments are straight through (pin-for-pin) with no swapped ends.
Alpha Micro also offers a pre-made cable featuring an RJ-45 connector on one end, and
a standard female DB-9 connector on the other end. For more information on RJ-45
cable adapters and types, refer to the AM-359 product installation instructions
(PDI-00359-00). The AM-359 PDI has details on the cables and adapters available from
Alpha Micro to interconnect just about any serial device to these ports.
PARALLEL PRINTER PORTS
Eagle 100 computers have one standard-speed parallel port, accessed from the rear
panel via one DB-25 female connector. Eagle 300-500 computers have two high-speed
parallel ports, and Eagle 550 computers have four high-speed parallel ports. All Eagle
parallel ports support the industry standard Centronics interface. The signal pinouts for
the parallel ports are as follows:
To insure the reliability and performance of your parallel ports, avoid using parallel
printer cables longer than six feet.
Eagle Series Computer Owner’s Manual, Rev. 03