Analog Way Graphic Switcher II - GSW2811 - Manuel (Page 34)

GRAPHIC SWITCHER II™
PAGE 34
Chapter 10 : RS-232 PROGRAMMER'S GUIDE
10-1. INTRODUCTION
If you need to use your own Control Software from a PC, or WORKSTATION with an RS-232 port, the GRAPHIC
SWITCHER II
™ allows communicating through an ASCII code protocol.
The GRAPHIC SWITCHER II ™ treats any character received on its RS-232 as a possible command but, it only accepts
legal commands. There is no starting/ending in a command string.
A command can be 1 or 2 characters typed on a keyboard and does not require any special characters before or after it.
(it is not necessary to press "ENTER" on the keyboard). A command can be preceded by a value (see chapter 10-2.
COMMANDS STRUCTURE).
When the GRAPHIC SWITCHER II ™ receives a valid command, it will execute the command. Then it will send back
the status of all the parameters that have changed due to this command from the control device.
For example: When you pre-select an input the GRAPHIC SWITCHER II
™ indicates the input that you have pre-
selected and the status of all its parameters (input standard, image adjustment,...)
If the command cannot be executed (value out of range, no signal on the selected input), the GRAPHIC SWITCHER
II
™ just send back the current status of the corresponding parameters.
If the command is invalid, an error response will be returned to the controlling device. All responses sent to the
controlling device end with a carriage return <CR> and a line feed <LF> signaling the end of the response character
string. (see chapter 10-3. ERROR RESPONSES).
10-2. COMMANDS STRUCTURE
Commands are usually composed of a numerical value followed by the command characters (1 or 2). The characters
used without any numerical value return the current setting of the command.
COMMAND structure = VALUE (optional) + CHARACTER(S)
Examples:
COMMAND
VALUE CHARACTER(S)
RESPONSE DESCRIPTION
none fm OSYN0 Read the Sync type of the MAIN output.
10 V VP10 Set Vertical position to 10.
10-3. ERROR RESPONSES
When the GRAPHIC SWITCHER II ™ receives from the controlling device an invalid command or value, it returns an
error response:
COMMAND
VALUE CHARACTER(S)
RESPONSE DESCRIPTION
none BB E10 Invalid command.
70260 V E13 Invalid value.