Imagine Panacea Lite, Руководство по эксплуатации

Страница: 69 / 205

Chapter 4
P12×1-SP Installation, Configuration, and Operation
50
Copyright © 2004-2007, 2008, 2010, Harris Corporation
X-Y Control
of Datatek
®
Routers:
LXYTODATEK
NOTE : This submodule can also be set up to operate in LSERIAL mode. See
page 42 for more information about LSERIAL mode.
To control a Datatek
1
router via Harris control panels or automation software, use
the LXYTODATEK configuration in conjunction with the Datatek router. In this
application, the P12×1-SP will convert from X-Y to Datatek protocol.
The Datatek protocol is a bidirectional RS-232/RS-422 (default is RS-232) protocol
where all communications are initiated by the controller (in this case the controller
is the LXYTODATEK). The LXYTODATEK comes up, sends a DEL character to reset
the Datatek communications and begins to search for frames by sending out
Expanded Tally Requests to the Datatek port. When it receives a status response
from this request, the LXYTODATEK uses the information to determine the levels
and size of the Datatek router connected to it. From this point on, communications
with the Datatek router are limited to an “as-needed” basis.
The LXYTODATEK will wait for each character (other than the DEL/reset character)
to be echoed back to it. This wait will be at least 3-character times (changes based
on the baud-rate set). The LXYTODATEK will also guarantee at least 20 ms
between messages as recommended in the Datatek protocol documentation.
The LXYTODATEK will wait at least 1 second for a response to each message sent
to the Datatek router. This is 1 second from the last character of a message to the
first byte of a response. If a response is received earlier than the 1 second, the
LXYTODATEK will begin transmitting the next message (if any are pending). This
timing guarantees the Datatek router has enough time to process each message.
The LXYTODATEK supports the following functionality of the Datatek protocol:
1
“Datatek” is a trademark of Datatek Corp, Mountainside, New Jersey.
Table 4-6 Supported Functionality
Feature Description
Take Switches the source to the destination
on the requested levels controlled by
the Datatek router
Status Request Returns the status of the requested
destination controlled by the Datatek
router
Protect / Unprotect Protects or unprotects the requested
destination on all levels (Datatek calls
this feature “LOCK”)
IMPORTANT
: Datatek treats all communications from its serial port as if they were
coming from one device with an ADDR/ID of 253. This prevents the LXYTODATEK from
sending the actual ADDR/ID of the panel which requested a Protect to the Datatek router
Therefore, the Protect feature has been implemented as a Lock. In this implementation,
any panel can apply or remove the Lock. This is done to prevent a panel at an address
other than the one applying a Protect from being able to switch the Protected
destination.