Watchdog NTC to F500 PGW CAI REV0 July 2014
15
Relay status (Byte 32)
This byte contains information relating to the status of the Watchdog LED’s and Relays.
Although the byte is represented in Hexadecimal converting it to binary helps to explain
the contents a little better.
0000
:0000
The left hand four bits are always
0000
and can be ignored.
0000:0000
The right hand four bits contain the following information.
:
This bit indicates the condition of the STOP Led
(1=ON: 0=OFF)
:
This bit indicates the condition of the ALARM Led (1=ON: 0=OFF)
:
This bit indicates the condition of the STOP Relay (1=ON: 0=OFF)
:
This bit indicates the condition of the ALARM Relay (1=ON: 0=OFF)
Not used and always ‘
0000
’
When a relay is considered to be ‘ON’ we mean energized and when ‘OFF’ we mean de-
energized.
0000:0000 = 00 then no conditions exist
0000:0010 = 02 then the alarm Led is on
0000:1010 = 0A then the alarm Led and Alarm Relay are active
0000:0011 = 03 then both Led’s are ‘on’ and both Relays are ‘off’ (de-energized)
Persistent alarm value NTC only (Byte 35)
This is how long the temperature alarm will take in seconds before stopping the elevator.
The default value is ‘B4’ 180 seconds. If this value reaches ‘0’ then the elevator will be
stopped.
Update counter (Byte 34)
Every time the F500 successfully receives information from the chosen watchdog, then
this counter value will be incremented by 1. The watchdog treats serial communications
as low priority so occasionally requests for data can be ignored. It is advisable to keep
checking this value so as to know when new data has arrived in the F500. The counter
will increment from 0 to 255 and then return to 0 again in a continuous loop.
Below is an example of the data returned when the F500 is polling Watchdogs
