Keri Systems SB-293 - Manual (Page 93)

Keri Systems, Inc. Technical Reference Manual – PXL-250 and SB-293
Revision 5.5 P/N: 01836-004 Page 93
Figure 11-2: Close-Up of JP-3, S1, and Address Display LEDs
NOTE: Resetting the system RAM completely erases all information within the PXL-
250 controller. Should there be any information in system RAM from an access control
installation and the system RAM is reset, the information in the controller is lost and
cannot be recovered from the controller.
11.1.4 Controllers with Modems
If the controller is a master controller and it communicates with the host
computer via modem, power up the modem before powering up the controller.
This ensures the modem is ready and able to communicate with the controller
when the controller becomes ready to determine the method of communication
with the host computer. While most modems initialize quickly and can respond to
the controller’s inquiry, some take more time and result in the controller not
recognizing the modem and configuring itself for communication with the host
computer via a direct-connect serial cable.