Converting comunication from Modem to RS485
The existing keypads use modem technology for communication, who's data wires are not polarized. The new RS485 communication's date wires ARE polarized.
Here is a process for converting from Modem to RS485.
1. Coordinate with us so we can assist and also make the necessary changes to the software etc.
2. Install new Communicator
3. At each keypad (and I would start at the entry),
A - Take cover off, take a picture showing the wires on the 4 pin connector
B- Remove the 4 pin connector to power down the keypad
C - Remove the existing Modem daughterboard, replace with the new Rs485 board. Make SURE that each of the 6 pins of BOTH sides of the module are mated correctly.
D - Power unit back up.
E - Press the * then the # key. Top line left side should now read 485, anything following is irrelevant.
Check the communication polarity:
a - On the back of the keypad on the right side about an inch down (and may be partially obscured by the 485 daughter board) there are 3 green lights. If the middle green blinks communication/wiring polarity is correct. You can put the keypad back on the post. The blink rate of the middle light will increase as more keypads come on line. This is normal since the computer will *wait* for what seems like forever, when there is none or a few keypads connected. The more connected and communicating, the less wait between there will be and the faster the light will blink.
b - If the middle does NOT blink, swap the two data/communication wires on the
4 pin plug and recheck. From top to bottom on the 4 pin connector, the top two are power (positive then negative). The next two are the data.
What the lights mean
There are 3 LED indicator lights.
1 – Heart Beat
2 – Receive Data
3 – Reply back to computer
When working properly the receive data LED will go on then immediately after the Reply LED will go on. The heart beat blinks periodically to indicate that the brains are working.
