Remote-processing RPC-210 Instrukcja Użytkownika Pobierz pdf (Strona 29)

DIGITAL LINES BASIC SECTION 6

Page 6-1

Figure 6-1 Digital Input - Output connectors

INTRODUCTION

DIGITAL LINES SECTION 6

Digital I/O lines ar e used to inter face with opto-module

racks, switches, low current LED’s, and other TTL

Digital I/O lines ar e used to inter face with opto-module

racks, switches, low current LED’s, and other TTL

devices. The RP C-210 has 37 of these lines. 24 go to 26

pin connector J3. The remaining lines go to J5 and J7.

Some of the lines may be used for multiple uses. These

uses include:

LCD display at J4 (shared with J3)

Keypad at J5. Inputs only at J7

Keypad column outputs 1-4 are dedicated to the keypad.

This is because keypad scanning automatic in RPBASIC-

52. However, keypad row inputs m ay be used fo r inputs

at J7.

J7-17 is used for autorun detect. When this line is low,

RPBASIC-52 automatically executes the first BASIC

program on power up, reset, or CALL 0 command.

Three RPBASIC-52 commands are used to access lines

at J3: LINE, LINEB, and LINE #. Two event-driven

commands, ON LIN E and ON C OUNT, monitor the

lines. Lines at J3 ar e configured for inputs and outputs

using the CONFIG LINE command. L ines at the other

ports are accessed u sing LI NE B.

RPBASIC-52 Programming Manual difference

The syntax for LINEB is slightly different than shown in

the RPBA SIC-52 m anual.

A = LIN EB(address) Read from I/O area

LINEB, address, data Write to I/O area

There is no i/o bank param eter as shown in the m anual.

The Programming Manual states that lines are checked

every 5 mSec for ON COUNT and ON LINE. Lines are

checked every 10 mSec on the RPC-210. Maximum

counting frequency is effectively 45 Hz. Lines must be

stable for 10 mSec or longer to ensure detection.

ELECTRICAL CHARACTERISTICS

Digital output ports sink and source a limited amount of

current. Each por t is different as shown in the table

below:

Ports Current @ condition

J3 20 mA sink @ 1V (low)

20 mA source @ 3.6V (high)

J5 & J7 10 mA sink @ 1V (low)

10 mA source @ 3.6V (high)

Digital inputs at J3 have 100K resistor pull ups. Inputs

at J5 and J7 have 10K pull ups. For a m ore noise

immunity, add a lower value pull up r esistor to the inp ut.

NOTE: The 82C55 inputs at port A are latched.

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 59 60

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