1. Introduction
The
SDM-SIO1A
and
SDM-SIO4A
Serial
Input/Output
Modules
are
designed
to
allow
expansion
of
the
number
of
serial
ports
available
on
a
data
logger
for
communicating
with
intelligent
sensors
or
driving
external
displays.
The
SDM-SIO1A
is
a
functional
replacement
for
the
SDM-SIO1
interface,
being
slightly
smaller
and
having
different
labe
l
ling
for
some
terminals
(see
for
more
details
of
the
differences).
Figure 1-1. SDM-SIO1A Serial Input/Output Module
The SDM-SIO4A module is functionally the same as four SDM-SIO1As fitted inside in a compact
case providing four serial ports. The SDM-SIO4A is used in the same way as the SDM-SIO1A and
uses the same CRBasic code in the data logger. Although it has a similar function to the older
SDM-SIO4 module, it is much easier to use, smaller, less expensive, has more flexible outputs,
and uses different instructions in the data logger.
SDM-SIO1A and SDM-SIO4A Serial Input/Output Modules
1
