Chapter 4
P12×1-SP Installation, Configuration, and Operation
96
Copyright © 2004-2007, 2008, 2010, Harris Corporation
X-Y Control
of Sierra
®
Routing
Switchers :
LXYTOSIERRA
NOTE
: This submodule can also be set up to operate in LSERIAL mode. See
page 42
for more information about LSERIAL mode.
Use the LXYTOSIERRA configuration to translate the commands coming from X-Y
to allow the control of Sierra routing switchers
1
. The P12×1-SP translates X-Y
commands to Sierra commands, and Sierra responses to X-Y responses. In this
application, the P12×1-SP will allow the Sierra routing switcher to be seen by the
X-Y in the same way that it would be seen if it was a Harris routing switcher.
The LXYTOSIERRA protocol is an RS-232 protocol. When the LXYTOSIERRA is
powered up, it requires approximately 4 seconds to update the internal status
table.
System and
Matrix Discovery
System Discovery
LXYTOSIERRA supports the discovery of a new Sierra router, and the loss of
communication with the previously discovered Sierra router.
Sierra Discovery
The LXYTOSIERRA will go into a discovery sequence on startup. During the
discovery sequence the unit will establish the frame size and crosspoint connects of
the connected switcher. Crosspoint information will then be relayed back to X-Y.
The LXYTOSIERRA will remain in discovery until the following events complete:
1
A Sierra “L” message is sent to Sierra switcher to query frame size.
2
A Sierra “L” response message is received to indicate the frame size is
received.
3
The frame size is sent on X-Y.
4
A Sierra “S” message is sent for each level found during frame size discovery
to query crosspoints at each level.
5
A Sierra “X,” “Y,” or “V” response is received for each level queried.
6
Data from each crosspoint disclosed in the “S” response message is sent via an
S: message to X-Y.
7
A Sierra “B” command is sent for each destination to require the lock status.
8
A Sierra “B” command response for each destination indicating the lock
status.
Loss of
Communication
The LXYTOSIERRA will detect when the previously discovered Sierra has been
disconnected. Upon detection the P12×1-SP will reset and start the discovery
mechanism over.
Detecting and
Reporting Alarm
Conditions
No alarm condition is reported by the Sierra routing switcher; therefore, the
P12×1-SP will reply with an Alarm Free message to any alarm status request from
the X-Y side.
1
The Sierra routing switcher is a product of Sierra Video Systems, Grass Valley, California.
