User Manual DEV 1953
Copyright DEV Systemtechnik GmbH 2015-2017
101
If the device is in Simultaneous switching mode and a Leitch switching com-
mand is issued for a member of a group, the whole group is implicitly
switched to the desired target position. Naturally, only the response (for
the addressed member) is returned.
This means that following two scenarios are to be distinguished for the com-
mands "Request Crosspoint Status" (chapter 5.7.4.5) and "Direct Crosspoint
Take" (chapter 5.7.4.6):
(1): Individual switching mode with Individual Switch Level Assignment Enabled
and
(2): Individual Switch Level Assignment Disabled
5.7.2
Leitch Protocol Communication Structure
The basic command structure is:
Command:
@
<sp>
<command>
<CR>
Notation:
@
= the "AT" sign
<sp>
= the "space" character
<CR>
= the carriage return or carriage return/line feed character(s)
Other characters used in this context:
?
= the question mark character
!
= the exclamation mark character
,
= the comma character
:
= the colon character
/
= the slash character
Note:
All commands start with a "
@
", followed by the space character
<sp>
.
The command input is completed with a carriage return character
<CR>
.
Parameter numbers are noted in hexadecimal format ("0"…"9" and "A"…"F")
and the counting is zero based, i.e. starting from "0"; e.g. "
1
" for addressing the
second input port.
For corrections during the command input, the backspace key ("←" on the
keyboard) is supported.
The device sends a new prompt ("
>
") after the execution of a command and
after the possible response of a command to indicate that it is ready for the
next command.
If the syntax of the command is not correctly entered, if a parameter exceeds
the permissible range, or if there is an attempt to switch in Local Mode,
the device responds with the Leitch Error Message:
*** ERROR 2002 *** Illegal, Invalid, or overrange parameter entered
Command entry ignored
>_
Except to the "Enable Reporting" command (please refer to chapter 5.7.4.1) the
device always returns a response to a command.
The switching command (
X:
, chapter 5.7.4.6) can be only executed in
Remote Mode.
