User`s manual

XP8300/XP8400/SE1100 PLCBus s 59
Two independent buses exist on a 26-conductor connector: the LCD bus
and the PLCBus.
LCD Bus Signals
The LCD bus consists of the following signals:
 LCDX  positive-going strobe.
 /RDX  negative-going strobe for read.
 /WRX  negative-going strobe for write.
 A0X  address line for LCD register selection.
 D0X-D7X  bidirectional data lines (shared with expansion bus).
The LCD bus is used to connect Z-Worlds OP6000 series interfaces or to
directly drive certain small liquid crystal displays. Figure A-2 illustrates
the connection of an OP6000 interface to a BL2100 controller.
Figure A-2. OP6000 Connection to BL2100
PLCBus Signals
The PLCBus may be used as a 4-bit bus (D0XD3X) or as an 8-bit bus
(D0XD7X). Whether it is used as a 4-bit bus or an 8-bit bus depends on
the encoding of the address placed on the bus. Some PLCBus expansion
cards require 4-bit addressing and others (such as the XP8700) require
8-bit addressing. These devices may be mixed on a single bus.
The PLCBus consists of the following signals.
 /STBX  negative-going strobe.
 A1XA3X  three control lines for selecting bus operation.
 D0XD3X  four bidirectional data lines used for 4-bit operations.
 D4XD7X  four additional data lines for 8-bit operations.
 /AT  attention line (open drain) that may be pulled low by any
device, causing an interrupt.
Yellow wire
on top
PLCBus Header
Note position of connector
relative to pin 1.
From OP6000
KLB Interface Card
Header J2
Pin 1