Extron electronics IP Link IPL T CR48, Руководство пользователя

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Communication and
Control
This section describes communication with the IPL T CR48 as well as AV device control.
Topics that are covered include:
•
Ports Overview
• Communication with the Interface
• Programmer Guide for the Telnet and Web Browser
• Device Control
•
Troubleshooting
Ports Overview
Contact Closure Input Ports
The contact closure inputs on the IPL T CR48 are able to detect a closed circuit between
any of the inputs and ground. The contact closure input ports use a 1k ohm pull-up resistor
in a TTL (5 VDC) circuit to sense external switch or contact closure.
By connecting one side of an external switch or relay to the contact
+5V
1K
closure ground port and the other side to one of the four contact
closure input ports, logic 1 (closed) can be produced. Logic 0 (open)
can be produced by disconnecting either side of the external switch
or relay from the IPL T CR48.
Relay Ports
The relay ports can be used for remote switching of low level signals. The relays can be
activated via software in three ways:
1. The
Port Settings
default web page found under the
Configuration
tab (see
figure 15 on page 19).
2. Telnet
3. An event script running on the IPL T CR48
The
Port Settings
web page allows you to turn any of the eight relays on or off.
Telnet allows you to send SIS commands (see Command and Response Table for SIS
Commands on page 27 to turn the relays on or off directly.
Event scripting allows an event script to turn the relays on or off based on the state of the
four inputs on the IPL T CR48, or any other event script conditions.
States of the relay ports are volatile; if a given relay port is on and power for the unit is
turned off, the state of the port is not remembered. When the unit is powered on, the relay
ports are open and the corresponding LED will be off.
IPL T CR48 • Communication and Control 16