Programmable Device Server with I/O Expansion Slot(s)
PDS-8x1 Series User Manual, Version 1.1.2, Apr. 2015
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1.
Introduction
The PDS-811 and PDS-821 programmable device servers (PDS) are compact, modular, intelligent,
rugged, and are designed for networking RS-232 and RS-422/485 serial devices to an Ethernet
network. The PDS-811 has one I/O expansion slot, while PDS-821 has two I/O expansion slots that
can be used to attach various 2- or 4-port serial communication modules. Therefore, a maximum of
4 serial ports can be installed on the PDS-811 or a maximum of 8 serial ports can be installed on the
PDS-821.
Note: There is no serial module built-in to the PDS-811 or PDS-821 by default.
The PDS-811 and PDS-821 controllers are equipped with a 2-port 10/100 Base-TX Ethernet Switch
that can be used to connect two network segments. The Ethernet Switch processes and routes data
on the data-link layer (layer 2) of the OSI model to create a different collision domain per switch
port. Using a switch allows you to attain dedicated bandwidth on point-to-point connections with
every computer, and therefore run in full duplex mode with no collisions. Furthermore, the built-in
2-port Ethernet Switch on the PDS-811/821 enables network wiring to be simplified by cascading
your Ethernet devices.
The PDS-8x1 series contains a built-in operating system, the MiniOS7, which offers a stable and high
performance environment that is similar to DOS. The MiniOS7 can boot up the PDS-8x1 series
within just one second, with the added benefit of no virus problems and a small footprint.
Furthermore, the PDS-8x1 series is designed for low power consumption, maintenance elimination
(no hard disk and no fan), and is constructed from fire retardant materials (UL94-V0 level) with a
robust case.
