Myalarm V-LCD1 Bedienerhandbuch PDF herunterladen (Seite 274)

TROUBLESHOOTING

12-268

System 2 Installation / Programming Manual

“Memory Corrupt” and “Reset” messages while programming the

unit

Possible Cause:

U The system is probably getting a great deal of electrical noise.

U Make sure Terminal #1 is connected to a good earth ground. Generally a cold water pipe

that goes to ground is best.

U Remove the reader/keypad wiring and attempt to program after pressing the “Reset” button.

If the problem clears up, verify that the correct shielded, non-twisted wire is not being run

near AC lines or flourescent lighting (both of which emit a great deal of noise)

U Disconnect the power transformer and run the unit on it’s backup battery during

programming. If the problem disappears, the AC line being used probably has noise on it

being generated by other equipment powered from the same line. Try a good surge

suppressor/filter or find a “cleaner” power line.

“Invalid Configuration” message when trying to turn a particular

slave on

Possible Cause:

U That slave doesn’t have all of the same options activated as the master.

My master board will not communicate with any slave

Possible Cause:

U Verify in programming that you have added the slaves to the network.

U Make sure the polarity of the RS485 buss (Terminals #14 & #15) do not get crossed

anywhere in the RS485 communication lines between the System 2 boards.

IMPORTANT: The first and last System 2 board must have a 120ohm resistor installed

across Terminals #14 & #15. Failure to install these resistors will result in erratic

operation of the entire System. Refer to Figure 34.

U Remove all the units from the RS485 communication line.

U Attach an AC volt meter between Terminal #14 and ground (Terminal #1).

U Enter program mode. Go to Option #18 - Networking, choose Test RS485 and press #.

AC voltage should be present between 1.9 VAC and 2.2 VAC. This voltage will last about 10

seconds.

U Put the meter between Terminal #15 and ground (Terminal #1).

U Enter program mode. Go to Option #18 - Networking, choose Test RS485 and press #.

AC voltage should be present between 1.9 VAC and 2.2 VAC.

This voltage will last about 10 seconds.

Now put the meter between Terminals #14 & #15.

U Enter program mode. Go to Option #18 - Networking, choose Test RS485 and press 3.

AC voltage should be between 3.8 VAC and 4.4 VAC. This voltage will last about 10 seconds.

This test assures the RS485 transmission ability of this circuit board.

If the proper voltages are not present, the RS485 communications circuit may be damaged and

the circuit board may have to be replaced.

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