Bosch Appliances LTC 8800, LTC 8600 Middle CPU DIP Switch S2, “Middle” S2 DIP Switch Function

LTC 8600 LTC 8800 Series en 51

14.1.2 Middle CPU DIP Switch S2

The middle DIP switch provides several user-selectable options. These options are as follows:

DIP Switch Number	Factory Default Setting	“Middle” S2 DIP Switch Function
1	OFF	Reserved
2	OFF	Alarm Port Mode
3	OFF	Old Keyboard Modes
4	OFF	Printer Port Mode
5	ON	Security Feature
6	OFF	Not Used
7	ON	Keyboard Protocol Mode
8	ON	Communication Parameters

•Switch 1 of S2

This switch is not used in these systems and should be left OFF.

•Switch 2 of S2

If switch 2 is turned ON, the alarm port on the rear of the main Allegiant bay is configured as an auxiliary console port. This auxiliary port allows the alarm port (in addition to the regular console port) to communicate with the optional LTC 8059/00 MCS package or the optional LTC 8850/00 GUI Software package.

The port can also be used to control the Allegiant system via the Console Com- mand Language (documented in the optional CCL manual). The normal console port and the alarm port (when switch 2 is on) may be used to control the Alle- giant system simultaneously. Communications parameters (baud & handshake) for the alarm port can be set using the keyboard (see User Function 32), with the optional LTC 8059/00 MCS package or with the optional

LTC 8850/00 GUI Software package.

Note that the pin-out of the alarm port differs from that of the console port, so the cable supplied with the optional LTC 8059/00 MCS package or with the optional LTC 8850/00 GUI Software package can not be used when interfacing with the alarm port. If necessary, See Chapter Appendix D, “Main Bay Rear Panel Connector Pin-outs,” on page 117 for the alarm port pin-outs.

•Switch 3 of S2

This switch setting is ignored if DIP switch 7 (described below) is set to ON. Current systems utilize a “variable speed” keyboard communication protocol. Older systems and keyboards were limited to using “fixed speed” keyboard communication protocols. In addition, there were two types of fixed speed pro- tocols available. By default, newer CPUs are set to operate using “six poll byte” variable speed mode, but if a newer CPU is installed into an older system, the existing keyboards would not operate with this format. This option switch is provided to support backward compatibility with the older style keyboards.

When this switch is set to OFF, the CPU in an LTC 8600 Series system communi-

cates with the system keyboards using a “four poll byte” protocol when this switch is OFF. When it is on, the keyboard communication uses an “eight poll

byte” protocol. For LTC 8800 Series systems, the settings are reversed: “eight poll bytes” when OFF, “four poll bytes” when ON.

This option is a global system setting that determines the communication pro- tocol that will be used for all keyboards connected to the system.

F.01U.127.393 2.0 2009.03 Instruction Manual Bosch Security Systems, Inc.