Keri Systems SB-293 - Manual (Page 92)

Technical Reference Manual – PXL-250 and SB-293 Keri Systems, Inc.
Page 92 P/N: 01836-004 Revision 5.5
11.1.2 Verify Wiegand Compatible Reader Supply Voltage
All Keri Systems proximity readers use 5 to 12 VDC power (except for the MS-9000
which uses 12 to 24 VDC power) while most Wiegand compatible readers use just 5
VDC power. For Wiegand configured PXL-250 controllers, there is a warning LED on
the controller board to indicate if the controller is applying 12 VDC to the Wiegand
compatible reader (see Figure 11-1). If your Wiegand compatible reader does operate
on 5 VDC no changes need to be made, the default position for the jumper is to set
power to 5 VDC. If your Wiegand compatible reader requires 12 VDC, turn the
controller power off and follow the instructions in the Jumper Settings section on
page 28 to set the reader supply voltage to 12 VDC. When power is restored, the
warning LED will turn on indicating 12 VDC is being supplied to the Wiegand
compatible reader.
Figure 11-1: Wiegand 12 VDC Warning LED
NOTE: Applying 5 VDC to a 12 VDC reader will not damage the 12 VDC reader.
However, applying 12 VDC to a 5 VDC reader very likely will damage the 5 VDC
reader. Be sure you are applying the correct supply voltage to the reader. Keri Systems
cannot be responsible for 5 VDC readers damaged by excessive voltage.
11.1.3 Resetting the Controller's RAM
If you're turning system power on for the first time, the PXL-250 controller's RAM
must be reset before performing any other action. This clears any spurious information
that may be in the RAM in preparation for entering your access control information.
On the controller, insert a jumper across pins 1 and 2 of JP3. Hold the S1 Address and
Diagnostics Button down and turn the controller's power on (see Figure 9-1 on page 39
and Figure 11-2 on page 93). The beeper for the reader attached to the controller will
beep as power comes on followed by a beep-beep indicating the controller's firmware
has reset the controller's RAM. Release S1. If the optional Alpha/Numeric Plug-in
Display has been installed, it will display a "SYSTEM RESET" message. Remove the
jumper on JP-3. The controller is now ready for programming.