Epson TM-U950P - B/W Dot-matrix Printer Specification page 38

NOTE: 1. A prefix "n" to signal names refers to "L" active signals. To the host provided with none of
the signal lines listed above, both-way communication fails.
2. For interfacing, signal lines shall use twisted pair cables with the return sides connected
to signal ground level.
3. Interfacing conditions shall be all based on the TTL level to meet the characteristics
described below. In addition, both rise time and fall time of each signal shall be 0.5Js or
less.
4. Data transmission shall not ignore the signal nAck or Busy. An attempt to transmit data
with either signal, nAck or Busy, ignored can cause lost data. (Data transmissions to the
printer shall be made after verifying the nAck signal or while the Busy signal is at the "L"
level.)
5. Interface cables shall be as minimum required short in length as possible.
* NC: No Connect
ND: Not Defined
5) Electrical Characteristics
Characteristics
Output HIGH voltage
Output LOW voltage
Output HIGH current
Output LOW current
Input HIGH voltage
Input LOW voltage
Input HIGH current
Input LOW current
Characteristics
Output HIGH voltage
Output LOW voltage
EPSON
DC Characteristics (Except Logic-H,
Symbol
V *2.4 V
OH
V -0.5 V
OL
I 0.32 V
OH
I -12 V
OL
V 2.0 V
IH
V -
IL
V -
IH
V -
IL
Logic-H Signal Sender Characteristics
Symbol
V 3.0 V
OH
V -
OL
TITLE
TM-U950/U950P
Specification
(STANDARD)
5 V signals)
Specifications
Min Max
5.5 V *IOH=0.32mA
*0.4 V *IOL=-12mA
- VOH=0.32V
- VOL=0.4V
-
0.8 V
-0.32 mA VIH=2.0V
12 mA VIL=0.8V
Specifications
Min Max
5.5 V
2.0 V While the power is OFF
SHEET
REVISION
D
A
Conditions
Conditions
NO.
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