Remote-processing RPC-210 Manual de usuario descargar pdf (Pagina 30)

DIGITAL LINES BASIC SECTION 6

Page 6-2

Figure 6-2 Connector

numbering scheme

When an input line is brought low, that line

will stay low until or unless pulled high

through a 4.7K ohm, or 1 mA source

current, to + 5V. This kind of input is not

a problem when driven by external TTL

outputs. However, if driven by open

collector circuits or switches, then a 4.7K

or lower pull up r esistor is necessary to

override the latch. This latch is only active

on 82C55 port A.

CONNECTOR NUMBERING SCHEME

Connectors J3, J5, and J7 are numbered in a scheme

similar to above. The view is looking down at the top,

or com ponent side of th e board . T he square pad, visible

on the circuit side of the board, designates pin 1. The

white line next to the connector outline designates a key

plug, if used, on the ribbon connector.

J3 DIGITAL PORT

Lines are accessed using the LINE or LINEB

comm ands. Lines ar e configured for inputs or outputs

using the CONFIG LINE command.

WARNING:

When configuring lines for outputs using CONFIG

LINE, lines go low momentarily (less than 10

micro-seconds) until they are set high again per the

data in the command line. Refer to CONFIG LINE

command in Appendix A for more information.

J3 is used to interface opto modules (using MPS series

racks), drive small relays, solenoids, motors, or lamps,

and provide gener al purpose TTL I/O to other logic

devices or mechanical switches. J3, port A is also used

to drive the LC D display port at J4. J3 pin out and a list

of shared pins is at the end of this section.

The lines on J3 are divided into 3 eight bit groups from

an 82C55. Ports A and B are configured as all inputs or

outputs. Port C is programmed as one gr oup of 8 inputs

or outputs or as two groups of four lines (upper and

lower C). The four lines in upper and lower C can each

be programmed as all inputs or outputs. Refer to T able

6-1 to determine the opto channel or J3 pin number for a

port. Use C ONF IG LIN E 100 (Se e Appen dix A) to

configure ports A, B, and C for inputs or outputs.

Digital I/O lines at J3 are pulled to + 5 volts or ground

through 100K resistor packs. See N OTE above

regarding Port A latching inputs.

Application program J3-1.BAS configures J3 for 12

inputs and outputs. P orts A and upper C ar e outputs

while ports B and lower C are inputs. CONFIG LINE,

LINEB, and LINE# com mands are used.

Digital I/O software commands

A brief description of how digital I/O commands are

used is described below. These commands are further

described in the RPBASIC-52 softwar e manua l.

CONFIG LIN E determines which lines are inputs and

outputs.

CONFIG LINE 100,3,255,0,255

Configures port A for output, B for input, upper C

and output, and lower C as input. The last three

numbers determine what state the outputs are after

initialization. You can set certain bits high and

others low by adjusting output data.

LINEB 0a202h,35

Writes a byte-wide data value of 35 to port C.

A = LINEB(0a201h)

Reads byte-wide data at port B.

The 82C 55 allows you to read back what was wr itten to

at a port. It is possible to read a port, set (or clear) a

bit, and write out to it again as follows:

LINEB,0a200h,LINEB(0a200h) .OR. 64

The above example reads port A, sets bit 6 high, and

writes the data back out to the same port.

Ports A, B, and C are accessed at the addresses listed

below.

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 59 60

Comentarios a estos manuales

Sin comentarios

Remote-processing RPC-210 Manual de usuario Pagina 30

Comentarios a estos manuales

Relacionado con productos y manuales para Ordenadores Remote-processing RPC-210