Chapter 4
P12×1-SP Installation, Configuration, and Operation
90
Copyright © 2004-2007, 2008, 2010, Harris Corporation
Loss of
Communication
The LXYTOLIGHTWAVE will detect when the previously discovered Matrix-Hub has
been disconnected. Upon detection the P12×1-SP will transmit a series of frame
size messages indicating the change (typically, “frame size 0”).
Detecting and
Reporting Alarm
Conditions
Unlike Harris products, the Lightwave Matrix-Hub will not send the bus unsolicited
alarm messages when an alarm occurs. To simulate operation as a Harris router,
the LXYTOLIGHTWAVE will periodically send the Lightwave CP <
Level
> command
to query for alarms.
1
After receiving the solicited CP response the message is parsed. If an alarm
condition exists:
The alarm value is stored in the event that X-Y solicits for alarms later with
the
Q?
message.
An unsolicited
Q:
alarm with the new alarm information is sent back on
X-Y.
2
Matrix-Hub CP response messages will be in the following formats:
2PP1,Power Supply A +5V: OK
2PP1,Power Supply A -5V: OK
2PP0,Power Supply B +5V: Failed
2PP0,Power Supply B -5V: Failed
2PT 95ßF
2PT 97ßF
2PT 91ßF
3
The P12×1-SP will convert Matrix-Hub status messages to Harris alarm
messages as follows:
If Power Supply A fails, the value “4” will be bit-masked into the alarm
message. Within Harris router control applications, this alarm value will
correspond to the alarm “Power Supply 1 Failure.”
If Power Supply B fails, the value “8” will be bit-masked into the alarm
message. Within Harris router control applications, this alarm value will
correspond to the alarm “Power Supply 2 Failure.”
If a temperature value exceeds 100° (either Centigrade or Fahrenheit), the
value “1” will be bit-masked into the alarm message. Within Harris router
control applications, this alarm value will correspond to the alarm “Fan 1
Failure.”
IMPORTANT:
Lightwave Communications has indicated that temperatures
above 100°F may be a concern, since at this temperature VGA output may
start to become distorted. However, in trial runs at Harris, standard operating
temperatures often exceed this value.
The elevated temperature may have little to do with an actual “Fan”
malfunction in the Matrix-Hub. Currently, Harris has no alarm value to indicate
elevated temperature. The temperature has been arbitrarily mapped to the Fan
alarm, as a closest match solution.
The temperature alarm condition is not dependent on the style of
measurement (i.e., Centigrade, Fahrenheit), only that the units meet or exceed
100. You can disable this alarm by running the Lightwave with “Display
Temperature in °C” mode. This mode is enabled by adjusting the DIP switches
in the Matrix-Hub control card (see “
Other Information
” [
page 93
]).
