Extron electronic RGB 202 Rxi VTG user manual RemoteControl,cont’d, RS-232 Programmer’s Guide

RemoteControl,cont’d

There are three ways to control input selection and centering features of an RGB 202 Rxi /RGB 202 Rxi VTG interface: by using the front panel controls, by using an RS-232 remote control device, and by using a contact closure keypad.

RS-232 Programmer’s Guide

The interface can be remotely controlled via a host computer or other device (such as a control system) attached to the rear panel 9-pin D RS-232 connector. The protocol is 9600 baud, 1 stop bit, no parity, and no flow control.

The control device (host) can use either Extron’s Simple Instruc- tion Set (SIS) commands or the graphical control program for Windows. RS-232 control software is included with the interface.

The rear panel RS-232 9-pin D female			5	1
connector has the following pin assignments:			DB9 Pin Locations
			9	6
			Female
Pin	RS-232 function	Contact closure	Description
1	–	Input 1	Select input #1
2	Tx	–	Transmit data
3	Rx	–	Receive data
4	–	Input 2	Select input #2
5	Gnd	Gnd	Signal ground
6	–	–	Not used
7	–	–	Not used
8	–	–	Not used
9	–	–	Not used

Host-to-interface communications

SIS commands consist of one or more characters per field. No special characters are required to begin or end a command sequence. When a command is valid, the interface executes the command and sends a response to the host device. All respon- ses from the interface 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.

Interface-initiated messages

When a local event such as a front panel or contact closure selection or adjustment takes place, the interface sends a message to the host. No response is required from the host. The interface-initiated messages are listed here (underlined).

(C)Copyright 2000, Extron Electronics, RGB 202 Rxi, Vx.xx The interface displays the copyright message when it first powers on. Vx.xx is the firmware version number.

RECONFIG

When a change is made via a front panel control or another operation occurs that must be written to a new memory block, the interface sends the reconfiguration message. No response is required from the RS-232 host, but the host may request a new status listing via the request information command (I/i). See the command/response table in this chapter for details.

Chn X2 The input number has been changed or,

for the RGB 202 Rxi VTG, the VTG has been turned on or off.

Error responses

When the interface receives a valid SIS command, it executes the command and sends a response to the host device. If the interface 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 number (the number is too large or small; occurs when attempting to select VTG mode via RS-232)

E06 – Invalid input selection (occurs when selecting an input when the RGB 202 Rxi VTG is set to VTG mode)

E10 – Invalid command

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

Using the command/response table

The command/response table lists valid command ASCII codes, the interface’s responses to the host, and a description of the command’s function or the results of executing the command. Lower case characters are acceptable in the command field only where indicated. The ASCII to HEX conversion table below is for use with the command/response table.

ASCII to HEX Conversion Table

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3-2 RGB 202 Rxi, RGB 202 Rxi VTG • Remote Control RGB 202 Rxi, RGB 202 Rxi VTG • Remote Control 3-3