Epson TM-U950 Technical Manual page 34

CONFIDENTIAL
The following illustrates an example serial interface connection:
Host (DTE example 8251)
TXD
DSR
CTS
RXD
DTR
FG
SG
When connected to a DCE-type device, data should not be
sent non-stop (without handshake).
DTE = Data Terminal Equipment
DCE = Data Circuit Terminating Equipment
Figure 1-16. Serial Interface Connection Example
Parallel interface
(Bidirectional parallel interface in accordance with the IEEE 1284 nibble/byte modes).
Copyright © 1994 by the Institute of Electrical and Electronic Engineers, Inc.
Compatibility mode
(Data transmission from host to printer: Centronics compatible)
Data transmission:
Synchronization:
Handshaking:
Signal levels:
Connector:
Reverse mode
(Data Transmission from printer to host)
The STATUS data transmission from the printer to the host is accomplished in the Nibble or
Byte mode.
This mode allows data transmission from the asynchronous printer under the control of the
host. Data transmission in the Nibble mode are made via the existing control lines in units of
four bits (Nibble). In the Byte mode, data transmission is accomplished by making the 8-bits
data lines bidirectional.
Neither mode can operate at the same time as the compatibility mode, so switching is always
required.
The 1284 Nibble/Byte modes may be subject to change without notice.
Rev. A
Printer
RXD
DTR
RTS
TXD
DSR
FG
SG
8-bit parallel
Externally supplied nStrobe signals
nAck and Busy signals
TTL compatible
57RE-40360-830E(DDK) or equivalent (IEEE 1284 Type B)
Features and General Specifications 1-23
TM-U950/U950P Technical Manual