RS 232 Information
JMB v 1.0 – 18-07-2000
Text entry for Meridian decoders
Introduction.
A feature has been added to Meridian 561,568 and 861 which allows users to input text to be displayed
on the front panel and OSD during normal operation.
The RS232 interface for Meridian products can be operated from any terminal which operates at 9600
baud with 1 start bit, 1 stop bit and no parity. Text entry commands take the form of 2 ASCII characters,
in some cases followed by a signed argument (‘nn’ below). All characters are echoed by the processor. A
carriage return character will execute the command, and backspace is also implemented. When the
‘display’ command is executed, the product will display the text on its front panel and OSD (aswell as
returning it on RS232), 12 characters for the 561 & 568, 20 characters for the 861.
Operation.
Text entry consists of four commands;
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Enter text to buffer
Modify text in buffer
Display text
Clear text from buffer
1. Enter text
TExxxx, where xxxx are four ASCII characters.
2. Display text
TDnn, where nn indicates how long the display should be on for, in multiples of 0.5 seconds, up to a
maximum of 6 seconds.
3. Modify text
TPnn sets the text entry point for the next string of four characters.
4. Clear text
Entering TC clears any text held in the buffer. It also resets the text entry point to the first character.
e.g.
TC¿
TEDoor¿
TE bel¿
TEl
¿
TD12¿
Displays “Door bell “ for 6 seconds. This could be sent repeatedly for a shorter period (e.g. TD2), to
flash the text on the OSD.
Meridian Audio Limited, Stonehill, Stukeley Meadows, Huntingdon, Cambs PE29 6EX
Tel +44 1480 52144 Fax +44 1480 459934
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