1
SDM-SIO1A and SDM-SIO4A
Serial Input/Output Modules
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 datalogger 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 label
l
ing for some terminals (see
Matching SDM-SIO1A Connections to an SDM-SIO1
(p. B-1)
, 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
datalogger. 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 datalogger.
