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PDF EDE1400 Data sheet ( Hoja de datos )
| Número de pieza | EDE1400 | |
| Descripción | Parallel-Printer Interface IC | |
| Fabricantes | E-Lab | |
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EDE1400 Serial to Parallel-Printer
Interface IC
Printer STROBE Line 1
Serial Data Input 2
Connect to +5V DC 3
Connect to +5V DC 4
Digital Ground 5
Printer Data 0 6
Printer Data 1 7
Printer Data 2 8
Printer Data 3 9
EDE1400
STROBE
BUSY
Serial In
Flow
+5V
OSC1
+5V
OSC2
GND
+5V
D0 D7
D1 D6
D2 D5
D3 D4
18 Printer BUSY Line
17 Hardware Handshaking (PC Only)
16 Oscillator Connection
15 Oscillator Connection
14 Connect to +5V DC
13 Printer Data 7
12 Printer Data 6
11 Printer Data 5
10 Printer Data 4
The EDE1400 Serial to Parallel-Printer (Centronics) converter IC is designed to allow printing on
most parallel-interface printers via microcontrollers and BASIC Stamps™. It allows such devices the
ability to create hard-copy output of data or status without the intervention of a PC and without the
I/O or timing demands of the printer's parallel interface. Typical applications include data logging,
status reports, parameter graphing, etc. Data is written to the EDE1400 over a single serial data wire
at 2400 Baud. The EDE1400 generates the appropriate printer control signals as well as monitors
printer status to cause the incoming serial stream to be printed on the parallel printer, thus allowing
designers the ability to use the less-expensive and more readily available parallel-type printers as
opposed to the more costly serial-input printers. The EDE1400 can also be used with most PC's,
allowing data to be sent to most parallel printers over a single serial wire; hardware handshaking
signals are also generated by the EDE1400 to allow it to communicate properly with the PC.
Connection to most microcontrollers, stamps, or microprocessors can be made using a single data
wire, without any type of voltage level conversion.
Some of the special features of the EDE1400 are as follows:
• Directly receives RS-232 data from microcontrollers or Stamps
• Single-chip design is ideal for embedded designs
• Prints any ASCII character on most Centronics/Parallel type printers
• Monitors printer status for reliable operation
• Allows printed data to be sent over a single wire
• Internal watchdog timer allows for trouble-free operation
• Operates from single +5V supply
• 2400 Baud serial input data rate (2400 N-8-1)
• Available in 18 pin DIP or SOIC packages
Copyright © 1997 E-Lab Digital Engineering, Inc. All Rights Reserved. Page 1
1 page  
USE OF THE EDE1400 WITH A PC
The EDE1400 can also be used with a PC, causing data sent out the PC serial port to be printed on a
parallel printer. This is convenient for extending the distance from printer to PC, testing the
EDE1400-printer interface in design projects, etc. The EDE1400 should work with most types of
printers, but will, of course, not provide the full range of functions gained when connecting the
printer to a PC using the traditional parallel port interface (e.g. paper out, etc.)
Serial data from a PC is a true RS-232 voltage levels (-15VDC to +15VDC) and must, therefore, be
changed to TTL-level signals. This can be accomplished by the use of a MAX232 voltage level
converter or similar device, as illustrated in Figure Two. When writing to the EDE1400 from a
terminal program, custom software, or another program that does not require hardware flow control,
you will need only to connect the serial data output pin from the PC to the serial data input pin on
the EDE1400 (as well as connecting printer Ground) to print on the printer. However, when printing
from DOS you will also need to connect the EDE1400's hardware handshaking pin to the PC. This
TTL level signal must first be sent through a TTL to RS-232 voltage level converter IC before going
back to the PC. Fortunately, one MAX232 IC or similar device contains the necessary drivers to do
both the incoming and outgoing conversions in one chip. When using the hardware handshaking,
connect the 'Flow' pin (Pin 17) of the EDE1400 to both the PC's CTS (Clear to Send) and DSR (Data
Set Ready) inputs. The following table illustrates the RS-232 pins required for both a 9-pin and a 25-
pin connector:
Signal Name
Ground
Serial Transmit
CTS
DSR
9-Pin D Connector
Pin 5
Pin 3
Pin 8
Pin 6
25-Pin D Connector
Pin 7
Pin 2
Pin 5
Pin 6
Table Two: RS-232 Pin Connections
Note: The CTS and DSR pins are only necessary when the host requires that hardware flow control
be used. Most hosts, such and stamps, microcontrollers, and microprocessors, do not require the
use of hardware flow control; in these cases the EDE1400's 'Flow' pin would be left unconnected.
The schematic in Figure Two illustrates the connection of a parallel printer to a PC via the EDE1400.
To print to is through DOS, the following command must first be issued to set serial communications
port properly (COM1 is used in this case):
MODE COM1 2400 N 8 1
This instructs DOS to set the parameters of COM1 to 2400 Baud, no parity, 8 data bits, and one stop
bit. To print a text file on the printer from DOS, you would type:
COPY textfile.txt COM1:
Copying the entire directory to the printer would be accomplished with:
DIR > COM1:
To re-route all output going to the LPT1: port (the standard parallel printer port) to the serial port
(COM1), type:
MODE LPT1: = COM1:
Copyright © 1997 E-Lab Digital Engineering, Inc. All Rights Reserved. Page 5
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet EDE1400.PDF ] | |
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