Re: COMM failed status of Fire Alarm 8000 series

[Bif <sample@xxxxxxx>]

albertleng wrote:
> Hi.
>
> I'm working on a VB programming project (residing in PC) which needs to
> receive data from a Fire Alarm 8000 series via RS232 and all the data
> received need to be converted to MODBUS addresses.
>
> The Fire Alarm 8000 series will not send anything to the RS232
> connected to my VB programming unless there's an event like Technical
> Alarm, fire in a zone, fault and reset. I manage to capture all these
> different events and convert them to MODBUS protocol addresses
> respectively.
>
> One of our customer's requirements is that whenever the Fire Alarm 8000
> series is disconnected from RS232 port of my PC, my VB program will be
> able to capture it and set the relevant bit in MODBUS addresses. This
> can't be done because as i wrote earlier, the fire alarm wont write
> anything to the RS232 as long as nothing happens. So, disconnecting
> Fire Alarm 8000 series from my PC is the same as "nothing happens".
>
> Does someone have any idea which my VB program can know when the fire
> alarm is disconnected from the RS232 port of the PC?
>
> Thanks.
>
> Albert
>
run an empty zone on the fire alarm thru the connection so that then it
is disconnected it will remove that current from the connection.  Have
program set up to look for that current and when it is missing to trigger?