HD SCAN™
PAGE 20
Chapter 11 : RS-232 PROGRAMMER'S GUIDE
11-1. INTRODUCTION
If you need to use your own Control Software Program with a PC, MAC or WORKSTATION by a RS-232 port. The
HD SCAN
™
allows to communicate by simple transmit or receive ASCII code.
The HD SCAN
™
treats any character that it received on the RS-232 as a possible command but accepts only legal
commands. There are no starting/ending in a command string.
A command can be 1 or 2 characters typed on a keyboard and does not required any special characters before or after it
(it is not necessary to press "ENTER" from the keyboard). A command can be preceded by a value (see chapter 11-2.
COMMANDS STRUCTURE).
When the HD SCAN
™
receives a valid command, it will execute the command. Then the HD SCAN
™
will send back
the status of all parameters that have changed due to this command.
If the command cannot be executed (value out of range, no signal on the selected input) the HD SCAN
™
just send back
the current status of the corresponding parameters.
If the command is invalid, an error response will be returned to the control device. All responses sent to the control
device end with a carriage return <CR> and a line feed <LF> signaling the end of the response character string. (see
chapter 11-3. ERROR RESPONSES).
11-2. 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 = VALUE (optional) + CHARACTER(S).
Examples:
COMMAND
VALUE CHARACTER(S)
RESPONSE DESCRIPTION
none F
TSY3
Read the output format.
10 v
VP10
Set the vertical position to 10.
11-3. ERROR RESPONSES
When the HD SCAN
™
receives from the controlling device an invalid command or value, it returns an error response:
COMMAND
VALUE CHARACTER
RESPONSE DESCRIPTION
none BB
E10
Invalid command.
70260 v
E13
Invalid value.
