Extron electronic System 7SC manual RS-232 Programmer’s Guide, Host-to-switcher communications

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Serial Communication

The System 7SC can be remotely controlled via a host computer or other device (such as a control system) attached to the rear panel RS-232 connector. The control device (host) can use either Extron’s Simple Instruction Set (SIS) commands or the graphical control program for Windows.

The switcher uses a protocol of 9600 baud, 1 stop bit, no parity, and no flow control.

The rear panel RS-232 9-pin D connector has the following pin assignments:

Pin

RS-232 function

Description

1

–

No connection

2

Tx

Transmit data

3

Rx

Receive data

4

Tx 2

Transmit data

5

Gnd

Signal ground

6

–

No connection

7

–

No connection

8

Rx 2

Receive data

9

–

No connection

51

96

DB9 Pin Locations

Female

Pins 4 and 8 on the host connector must be used for Tx2 and Rx2 only (for communicating with a slaved switcher), and not for other signals in the host system. If needed, disable or disconnect pins 4 and 8 on the host side.

RS-232 Programmer’s Guide

Host-to-switcher communications

SIS commands consist of one or more characters per field. No special characters are required to begin or end a command sequence. When the System 7SC determines that a command is valid, it executes the command and sends a response to the host device. All responses from the switcher to the host end with a carriage return and a line feed (CR/LF = ), which signals the end of the response character string. A string is one or more characters.

Switcher-initiated messages

When a local event such as a front panel (or SCP control pad) selection or adjustment takes place, the System 7SC switcher responds by sending a message to the host. No response is required from the host. The switcher-initiated messages are listed here (underlined).

(C) Copyright 2001, Extron Electronics, System 7SC, Vx.xx

The System 7SC sends the copyright message when it first powers on. Vx.xx is the firmware version number.

C hn X1 (where X1 is the input number)

The System 7SC sends this response when an input is switched. C = both audio and video were switched.

Error responses

When the switcher receives a valid SIS command, it executes the command and sends a response to the host device. If the System 7SC is unable to execute the command because the command is invalid or it contains invalid parameters, it returns an error response to the host.

The error response codes and their descriptions are as follows:

E01 – Invalid input channel number (the number is too large)

E10 – Invalid command

E13 – Invalid value (the number is out of range/too large)

E16 – Unit is busy

E23 – Checksum error.

4-2 System 7SC • Serial Communication

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Contents System Switcher System 7SCSicherheitsanleitungen Deutsch Safety Instructions EnglishConsignes de Sécurité Français Instrucciones de seguridad EspañolTable of Contents Table of Contents, cont’d System 7SC Table of Contents Iii Iv System 7SC Table of Contents One About the System 7SC What is the System 7SC?About this Manual Typical System 7SC applicationControlling the switcher and an A/V system MHz -3 dB video bandwidth Configurable video inputs Features and OptionsFeatures Options and accessories Introduction, cont’d Two Tabletop use Mounting the SwitcherCabling and Panel Views Rack mountingSystem 7SC Front Panel Power, video, and audio conections Front panel inputsRear panel inputs Captive screw connector wiring for rear panel audio inputs OutputsAudio inputs Control device connections RGBIR communications port IR Comm IR Communications port wiring options For the IR Emitter onlyUC 50, 100, 200 Cable Color Codes Connecting and Slaving a Switcher System 7SC master connected to a slaved switcher System 7SC Rear PanelExample of input numbering with a six-input slaved switcher Labeling Buttons on the System 7SC and SCPsButton-Label Generator software Installing the softwareUsing the software System 7SC button label screen SCP 200 button label screenInstalling labels in the System 7SC’s buttons Three System 7SC Operation and Configuration Front Panel Features and Basic OperationControl features Display Mute button Display Power buttonMode button Operation and Configuration, cont’d Adjustment featuresDisplay command indicator LEDs Input selection featuresMiscellaneous features Projector control memory usage IR and RS-232 Projector ControlProjector control memory ExampleSetting up a DVD source Optimizing the SystemDefault menus Menus, Configuration, and AdjustmentsMoving through menus by using front panel controls Menu overviewSwitcher Setup/Configuration Scaler Polarity +/V+Scaler Sync RGB format Scaler Rate resolution and refresh rateRGB Delay Triple-Action Switching Scaler Polarity sync polarityEdge Smoothing Add Slave slaving switchersSystem 7SC with a slaved switcher Audio/Video Adjustments Input Configuration signal formatImage Size Blank Input blanking adjustmentAudio Level Size InputIR Learning Configuration Navigating through the IR Learning Configuration menuClearing IR commands from memories Clearing IR commands from a button’s memoryInitiating IR learning Initiating IR learningGlobal system reset Image adjustmentsReset to Default clearing settings and adjustments Information/System OptionsCentering Executive mode front panel lockoutInput you wish to adjust SCP control pads Remote Control of the System 7SCEnabling and disabling executive mode IR 701 infrared remote control Selecting an inputFour Error responses Host-to-switcher communicationsSwitcher-initiated messages RS-232 Programmer’s GuideAscii to Hex conversion table Using the command/response tablesSymbol definitions Command Ascii Command Response Additional description Color Video configurationDetail mode TintVertical size Image sizeHorizontal size Top blankingFirmware version, part number & information requests Executive mode front panel lockoutZap reset to default settings Scaler settings Command Ascii Command Response ValuesDelay times Room relaysMiscellaneous settings Audio settingsIR-related settings Send/receive data to/from page 1 memory Command Hex. command Response Additional descriptionSend/receive data to/from page 0 memory Send/receive a flag parameter blockMini Mode Installing the softwareUsing the control program Control Software for WindowsConfiguration User ModeSpecial features Real Time Adjustments Projector Driver Saving and restoring configurations Room & Misc. OptionsKey to file names File name Description Using the help programDownloading and using projector drivers AAppendix a Specifications System 7SC Reference MaterialSync Reference Material, cont’d Included parts Replacement Part number Part Numbers and AccessoriesAccessories Accessories Part numberFirmware Upgrade Installation Align NotchesSystem 7SC Reference Material Glossary FCC Class a Notice Extron’s Warranty Asia JapanExtron Electronics, USA
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