User`s manual

ManualsBrandsZ-World ManualsComputer equipmentXP8900

XP8000 Series (PLCBus

)

Z-World 530-757-3737 12

Typical Operations

In the examples given below, the shorthand notation

BUS

xxx

value

stands for this assembly code

ld a,

value

out0 (BUS

xxx

),a

Perform board check

BUSADR0 0010

BUSADR1 000z

BUSADR2 yx10 ;select mode

BUSRD0 value ;1010 if board exists

Turn analog section on or off

BUSADR0 0010

BUSADR1 000z

BUSADR2 yx10 ;select mode

BUSWR 011

;

is 1 for on, 0 for off

Select a channel

BUSADR0 0010

BUSADR1 000z

BUSADR2 yx10 ;select mode

BUSWR 1

xxx

;

xxx

is channel (0–7)

Drive a channel

Select the channel, then...

BUSADR0 0010

BUSADR1 000z

BUSADR2 yx00 ;data mode

Repeat

BUSWR 000

;

is data

BUSWR 001

;bit 1 is clock

BUSWR 000

;not change clock same time as data

for each of 16 bits

Read or write the EEPROM

BUSADR0 0010

BUSADR1 000z

BUSADR2 yx01 ;EE mode

BUSWR 0000 ;Init EE clock and data bits

Make transaction with EE. Serial reads and writes

BUSWR 0000 ;Re-init the EEPROM

Current Consumption

The DAC8 board draws approximately 30 mA at 24VDC.

The AD5320s are single-channel 12-bit DACs. They consume

very little power: 140 µA at 5V and can power down to 200 nA

(at 5V). The contribution of the DAC channels to current con-

sumption is negligible.

The effect of power-down mode is also negligible.

DAC8 Specifications

Board Size 2.835 × 3.525 × ~0.75

Operating Temp –40°C to +70°C

Humidity 95% r. h., non-condensing

Power

24VDC, 30 mA

Provides Eight (or four) 12-bit DAC channels, output

rated –

10V to +10V.

Each AD5320 has a linearity of ±16 LSB and a gain stability of

approximately 5 ppm per °C.

The RS232 Board

Z-World’s RS232 (XP8700) expansion boards provide a simple

way to add an RS232 channel to your control system. Each

board has a single Signetics SCC2691 UART. Up to 4 RS232

boards can be addressed on a single PLCBus.

Latch

PAL

SCC2691 UART

232 Driver

3.686

MHz

RN1

R2R1

C1 C3 C4 C2

RS232

Jack

To operate the RS232 board’s UART, you read and write to two

registers on the RS232 board: the control register (CTRL) and

data register (DATA). In addition, the RS232 board can raise a

processor interrupt INT1.

The SCC2691 UART

The SCC2691 is a full-duplex asynchronous receiver/transmit-

ter. It supports 18 baud rates from 50 to 38,400 baud. Data may

be framed with from 5 to 8 data bits, four parity modes, and 1,

1.5, or 2 stop bits. The UART provides error detection (framing

errors, parity errors, and overrun errors), break detection and

generation, and echo. There are two diagnostic modes. The

chip also has a multifunction 16-bit counter/timer.

Bus Buffer

–

Communication

Transmit Holding

Receiver Holding

Registers (3)

MR1 & MR2

TxD

RxD

Operation Control

Address Decode

Interrupt Control

IMR

ISR

I/O Pins

Change of State

Detector

Function Select Logic

MPI

Timing

Baud Rate Generator

Clock Selectors

CSR

ACR

CTUR

Counter/Timer

CTLR

X1/CLK

A0–A2

READ

RESET

WRITE

ENABLE

Read/Write Control

INTR

The chip will generate interrupts under seven maskable condi-

tions. It has a low-power mode and a “wake-up” mode. Re-

ceiver data are buffered (4-byte FIFO).

Control of the UART is accomplished by reading or writing its

internal registers. You may set up a counter or timer, initiate

RS232 communication, or control interrupts. Options include

setting baud rates, parity and other modes.