User`s manual

PK2200
PLCBus s 97
Two independent buses, the LCD bus and the PLCBus, exist on the single
connector.
The LCD bus consists of the following lines.
 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
drive certain small liquid crystal displays directly. Figure E-2 illustrates
the connection of an OP6000 interface to a controller PLCBus.
Figure E-2. OP6000 Connection to PLCBus Port
The PLCBus consists of the following lines.
 /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.
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.
Yellow wire
on top
PLCBus Header
Note position of connector
relative to pin 1.
From OP6000
KLB Interface Card
Header J2
Pin 1