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Crestron ST-IO Input/Output Module

Input/Output Module: ST-IO

Introduction

Features and Functions

There are two Crestron

Input/Output Module configurations available: ST-IO and

STI-IO. Configuration differences depend on which power pack is used. The ST-IO

is supplied with a power pack for a 120V AC supply and the STI-IO is supplied with

a power pack for 220VAC. For purposes of this Operations Guide, the term ST-IO is

used for either configuration.

The ST-IO device has eight relays and four digital voltage/closure inputs. As part of

the Cresnet system, use of an external power pack is optional. This unit can operate

using the Cresnet

voltage or an external power supply.

NOTE: When connected to both the Cresnet power and the external power supply,

the Cresnet power is disconnected.

The ST-IO module incorporates eight relays that can be connected to controllable

devices. The eight normally open relays are isolated from one another.

The ST-IO also incorporates four digital inputs that can operate in one of two

modes: closure and voltage. The input mode is configured using internal jumpers.

The ST-IO is set to closure mode when shipped.

• In closure mode, the ST-IO detects switch/relay closures to ground (closed

= logic 1 and open = logic 0). The inputs are connected to 5 VDC via a

1.0K ohm “pull-up” resistor and protection diode.

• In voltage mode, the ST-IO detects active voltages (voltages > 2.5V = logic

1 and voltages < 1.5V = logic 0). The mode for these inputs is selectable via

internal jumpers.

Refer to “

Digital Input Modes” on page 7 for a description to change digital input

mode.

Functional Summary

• Eight isolated normally open relays

• Four digital inputs operating in closure mode or voltage mode

• Two network connectors for daisy-chaining units

• Rack mountable with optional ST-RMK (1 space height)

Operations Guide - DOC. 5675A Input/Output Module: ST-IO • 1

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