Analog-way Scan Vision VHX II - VHX480 Manual de usuario descargar pdf (Pagina 12)

Chapter 7 : RS-232 PROGRAMMER'S GUIDE SCAN VISION VHX II

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PAGE 12

Chapter 7 :

RS-232 PROGRAMMER'S GUIDE

7-1. INTRODUCTION

If you need to use your own Software Control program from a PC, or WORKSTATION with an RS-232 port, the

SCAN VISION VHX II

™

allows communicating through an ASCII code protocol.

The SCAN VISION VHX 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 is 1 character 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 7-2. COMMANDS

STRUCTURE).

When the SCAN VISION VHX II

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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.

If the command cannot be executed (value out of range,...), the SCAN VISION VHX 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 7-3. ERROR RESPONSES).

7-2. COMMANDS STRUCTURE

Commands are usually composed of a numerical value followed by the command character. The characters used

without any numerical value return the current setting of the command.

COMMANDS structure = VALUE (optional) + CHARACTER.

Examples:

COMMAND

VALUE CHARACTER

RESPONSE DESCRIPTION

none F TSY3

Read the input format.

10 H VPOS10

Set Vertical position to 10.

7-3. ERROR RESPONSES

When the SCAN VISION VHX II

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receives from the controlling device an invalid command or value, it returns an

error response:

COMMAND

VALUE CHARACTER

RESPONSE DESCRIPTION

none Z E10

Invalid command.

70260 H E13

Invalid value.

1 2 ... 7 8 9 10 11 12 13 14 15

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