How do you get the display to work in the Bell Vista 200 wall phone? Does it need some additional battery to operate the display?

It sounds like there may be an issue with the display module of the phone system. Here are a few steps you can try to troubleshoot the issue:

1. Check the power supply: Make sure that the power supply is providing the correct voltage and amperage to the phone system. If the power supply is faulty, it could be causing the display module to malfunction.
2. Reset the system: Try resetting the phone system by unplugging it from the power source for a few minutes, then plugging it back in. This can sometimes fix software or firmware issues that may be causing the display module to malfunction.
3. Check the display module connections: Make sure that the display module is securely connected to the phone system. If the connection is loose, it can cause the display module to malfunction.
4. Contact technical support: If none of the above steps work, it may be necessary to contact the manufacturer's technical support team for further assistance. They may be able to provide additional troubleshooting steps or recommend a repair or replacement of the display module.

Try this:

Reset the Unit

- remove all the batteries from the bell
- ensure the battery in the doorbell unit is working and remove the back cover
- replace the batteries in the bell unit
- within 30 seconds of the bell unit sounding the bell, press the melody changer button on the back of the door bell unit once
- remove all the batteries from the bell

Pair the Unit

- wait at least a minute after reset
- remove all the batteries from the bell
- replace the batteries in the bell unit
- within 30 seconds of the bell unit sounding the bell, press the door bell button

IF you are going all elec,you need a door bell,bell transformer and of course the push button. This is all low voltage so phone wire will work.You are just using 1 pair of wires so pick a pair such as the blue pair.Wire from push button to transformer to door bell.It is not polarity senstive....simple to do

Download the drivers of the mic in respect of the mic's model and the operating windows i.e vista 200.then configure the operating window by installing the drivers.

1) I tested this timer and read pdf on battery specs:
20-30 days is battery life for CR2 ST01C battery
http://waterheatertimer.org/ST01C-program.html#battery

2) In addition, Fixya customers report needing to change battery frequently when timer is located in garage.
The same is true for Aube timers since timer display is dependent on rechargeable battery.
I have not tested every timer, but it seems in-wall timers that are used for 3-way switching have this problem.

3) If your garage timer is not 3-way, where more than 1 switch controls same light, then buy single pole timer and replace Intermatic.
For example GE 15086 & 15071, Woods 59018 & 59028, Tork SS720 (which is GE), Utilitec 014224

4) If you need astronomic dawn-dusk timer that is single-pole and not battery operated, then buy Utilitec 0192773 - LW60419 at Lowes.
Link below gives manual and wiring, both are tricky judging by number of fixya requests.
http://waterheatertimer.org/Program-wire-Utilitec-LW60419.html

Add a comment for more free help.
Also take advantage of fixya phone service.
For a price, expert speaks with you over phone while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call.

Go here and download the manual for this phone
It explsins it in section 8
good luck
http://nsegainkc1.aliant.net/knowledge/docs/Repair/PhManuals/Vista200.pdf

Support for CIT 200 telephony kit:
http://www.linksysbycisco.com/UK/en/support/CIT200
Original firmware 3.7.0 download in more [5] languages.

Firmware update version 3.8.2 on the US site:
support
http://www.linksysbycisco.com/US/en/support/CIT200
firmware update
http://downloads.linksysbycisco.com/downloads/CIT200_dr.zip

I am currently running Windows XP on my PC and upgraded it to a Windows Vista operation System does a USB driver exist for Windows Vista that will allow me to connect to my Panasonic KX-TDA 200 Phone System.

i need a manual for a vista 200 to programme it and to clear stored info i bought it second hand

Turn off the fire wall and try it.