Toshiba B-570 SERIES User Manual

Page 45

1-9

1. OUTLINE OF THE SYSTEM

EM10-33006A

Signal Name

DATA 1 ~ 8

INPUT•PRIME

DATA•STB

BUSY

FAULT

PAUSE
ACK

Centronics interface
(1) Data input method:

8-bit parallel (DATA 1 ~ 8)

(2) Control signals:

ACK, BUSY, PAUSE, DATA;STB, INPUT; PRIME, FAULT, PE

(3) Data input code:

ASCII, JIS 8-bit code for European characters, 8-bit code for graphic

(4) Receiving buffer:

5KB

(5) Input/Output crcuit configuration and Input/Output conditions

1.5 ELECTORONICS SPECIFICATIONS

SN74LS14 or equivalent

SN7406 or equivalent

+5V

100P

Type

Input

Output

Configuration

Logical level (input)
"1" = 2~5 V
"0" = 0~0.4 V

Logical level (input)
"1" = 2.4~5 V
"0" = 0~0.4 V

Fig. 1-7

External I/O interface
(1) Interface circuit

■

Input circuit

Fig. 1-8

There are five input circuits, and each input is a current loop using a photo-coupler. The anode of the
photo-coupler is connected to common pin COM1 in each of the five circuits. Each cathode is
independent. The voltage of Vcc is 24 V (max.) while the diode operating current is 16 mA.

External controller, etc.

Vcc

Photo-coupler
TPL521 (TOSHIBA)

COM1

IN0

IN4

Printer