Extron electronics IN1508 Manuale utente

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NetLinx Module Interface Specification

for

Extron IN1508 Switcher/Scaler

Professional Control Solutions LLC 3804 Parchment Circle Richmond, VA 23233-7034

804-364-3809 [email protected]

TABLE OF CONTENTS

Introduction................................................................................................................................................3

Overview....................................................................................................................................................3

Implementation ..........................................................................................................................................3

Port Mapping..............................................................................................................................................4

Channels.....................................................................................................................................................5

Levels.........................................................................................................................................................5

Command Control......................................................................................................................................6

Command Feedback...................................................................................................................................7

Device Notes..............................................................................................................................................7

Programming Notes ...................................................................................................................................7

Adding Functions to Modules....................................................................................................................8

Commands to the device........................................................................................................................8

Responses from the device.....................................................................................................................8

Date

Initials

Version

Comments

06-05-2008

V1.0.0

Initial release

09-22-2009

V1.1.0

Minor changes to queue handling

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Introduction

This is a reference manual to describe the interface provided between an AMX NetLinx system and an

Extron IN1508 Switcher/Scaler.The Extron IN1508 Switcher/Scaler supports an RS-232 serial protocol.

The required serial communication settings are a baud rate of 9600, 8 data bits, 1 stop bit, no parity, and

handshaking off.The cable for this device is FG#10-752. The wiring diagram for this cable is as follows

AMX NXI AMX NI Extron Crosspoint (Male DB9)

(Gnd) 1 (Gnd) 5 __________ (Gnd) 5

(Rx) 2 (Rx) 2 __________ (Tx) 2

(Tx) 3 (Tx) 3 __________ (Rx) 3

This module package contains only the COMM module. There are no Main or UI .axi files provided.

Overview

The COMM module translates between the standard interface described below and the switcher serial

protocol. It parses the buffer for responses from the switcher, sends strings to control the switcher, and

receives commands from the main program.

The following diagram gives a graphical view of the interface between the interface code and the Duet

module.

Some functionality in the device interface may not be implemented in the API interface. In cases where

device functions are desired but not API-supported, the PASSTHRU command may be used to send any

and all device-protocol commands to the device. See the PASSTHRU command and the Adding

Functions to Modules section for more information.

Implementation

To interface to the AMX Extron IN1508 Switcher/Scaler module, the programmer must perform the

following steps:

1. Define the device ID for the switcher that will be controlled.

Extron

IN1508

NetLinx

COMM

Module

NetLinx

Main

Program

Virtual

Device

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2. Define the virtual device ID that the Extron IN1508 Switcher/Scaler COMM module will use to

communicate with the main program and User Interface.

3. The NetLinx Extron_IN1508_Comm module must be included in the program with a

DEFINE_MODULE command. This command starts execution of the module and passes in the

following key information: the device ID of the switcher to be controlled, and the virtual device

ID for communicating to the main program.

For an example of how to do this, see below:

DEFINE_DEVICE

dvSwt = 5001:1:0 // serial control

vdvSwt = 33001:1:0

dvTP = 10001:1:0

define_module 'Extron_in1508_Comm mSwtDev (vdvSwt, dvSwt)

Upon initialization the AMX Commmodule will communicate with the switcher and information will be

exchanged.

Port Mapping

This module uses multiple virtual devices in order distinguish events for one zone from another.

Virtual Device

Channels

Levels

Control

Feedback

33001:1:0

All Channels

All Levels

All Control Cmds

All Feedback Cmds

Table 1 - Port Mapping

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Channels

The main program controls the switcher via channel events (NetLinx commands pulse, on, and off) sent to

the COMM module. The channels supported by the COMM module are listed below. These channels are

associated with the virtual device and is independent of the channels associated with the touch panel

device.

Note: An ‘*’ indicates an extension to the standard API.

Channel

Description

PULSE: Ramp Volume Up 1db

PULSE: Ramp Volume Down 1db

PULSE: Cycle Volume Mute

199

ON: Set Volume Mute On –used for feedback also

OFF: Set Volume Mute Off

251

ON: Device is Online –used for feedback only

OFF: Device is not Online

Table 2 - Virtual Device Channel Events

Levels

The main program controls the switcher via level events (NetLinx command send_level) sent to the

COMM module. The level supported by the COMM module is listed below. This level is associated with

the virtual device and is independent of the levels associated with the touch panel device.

Note: An ‘*’ indicates an extension to the standard API.

Level

Description

Volume Level (range 0…255)

Table 3 - Virtual Device Level Events

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Command Control

The main program the switcher via command events (NetLinx command send_command) sent to the

COMM module. The commands supported by the COMM module are listed below.

Note: An ‘*’ indicates an extension to the standard API.

Command

Description

SWITCH=<input>

Switch the input to the output.

<input> : 0 = disconnect input channel

1..8 = input channel

SWITCH=1

DEBUG?

Query the state of the debug feature.

DEBUG?

DEBUG=<value>

Set the state of debugging messages in the Comm.

module.

Note: See Programming Notes section.

<value> : 0 = set all messages off

1 = set all messages on

DEBUG=1

PASSTHRU=<string>

Allows user the capability of sending commands

directly to whatever unit is attached with minimal

processing by the Duet module. User must be aware of

the protocol implemented by the unit to use this

command. This gives the user access to features that

may not be directly supported by the module. For more

information, see the “Adding Functions to Modules”

section below.

Note: The terminating characters should not be sent.

The module will append them.

<string> : string to send to unit

PASSTHRU=2*1B (Video Mute)

SWITCH?

Query for the input channel that is currently

connected to the output channel.

SWITCH?

VERSION

Query for the current version number of the Duet

module.

VERSION?

Table 4 –Send Command Definitions

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Command Feedback

The COMM module provides feedback to the main program for switcher changes via string events. The

strings supported are listed below.

PLEASE NOTE: Feedback is only provided when there is a state change. If no state change resulted

from the command sent in, then no feedback will be returned.

String

Description

DEBUG=<value>

Returns the state of debugging messages in the UI module

and the Comm. module.

<value> : 0 = all messages off

1 = set all messages on

DEBUG=1

SWITCH=<input>

Reports the input channel that is currently connected to

the output channel. This string is sent in response to

the CL= command being successfully executed or in

response to the SWITCH= command.

<input> : 0 = no input channel connected

1..8 = input channel

SWITCH=1

VERSION=<version>

Reports the version number of the module.

<version> : x.y.z = module version number

VERSION=1.0.0

Table 5 - Command Feedback Definitions

Device Notes

The supported device is the Extron IN1508.

Programming Notes

By default the number of inputs is 8 and the number of outputs is 1.

This module de-queues commands to the device at a regular interval of 200 milliseconds and also

de-queues when valid response is received.

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Adding Functions to Modules

Commands to the device

This module supplies a mechanism to allow additional device features to be added to software using the

module. This is the ‘PASSTHRU=‘ command, which allows protocol strings to be passed through the

module. The device-specific protocol must be known in order to use this feature.

As an example, suppose that a module for a projector has not implemented the 'white balance adjustment'

feature. The command that the projector protocol requires is 03H, 10H, 05H, 14H, followed by a

checksum. The documentation for the ‘PASSTHRU=‘ command specifies that the module will

automatically generate the checksum. In this case, the following string should be sent from the UI code

to implement 'white balance adjustment'.

send_command vdvDevice, "'PASSTHRU=',$03,$10,$05,$14"

The reason to use ‘PASSTHRU=‘ instead of sending a protocol string directly to the device port is that

the device may require command queuing, calculation of checksums, or other internal processing, which

would not be done if the string was sent directly. Because of this, it is best to filter all communication TO

the device through the module. (The module documentation will indicate any processing that will be

automatically done to the ‘PASSTHRU=‘ command like checksum calculation.)

Responses from the device

The module will automatically interpret replies from the device and pass these on to the application code

according to the documented API. Some device replies may not be passed on to the application code.

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