Epson TM-U950P Specifications - Page 38

DC Characteristics Except Logic-H, V signals, Logic-H Signal Sender Characteristics

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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 DC Characteristics (Except Logic-H, 5 V signals) Characteristics Output HIGH voltage Symbol Specifications Min Max VOH *2.4 V 5.5 V Conditions *IOH=0.32mA Output LOW voltage VOL -0.5 V *0.4 V *IOL=-12mA Output HIGH current IOH 0.32 V - VOH=0.32V Output LOW current IOL -12 V - VOL=0.4V Input HIGH voltage VIH 2.0 V - Input LOW voltage VIL - 0.8 V Input HIGH current VIH - -0.32 mA VIH=2.0V Input LOW current VIL - 12 mA VIL=0.8V Characteristics Output HIGH voltage Output LOW voltage Logic-H Signal Sender Characteristics Symbol Specifications Min Max Conditions VOH 3.0 V 5.5 V VOL - 2.0 V While the power is OFF TITLE EPSON TM-U950/U950P Specification (STANDARD) SHEET NO. REVISION AD NEXT 1272-3 SHEET 1271-2

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EPSON
TITLE
SHEET
REVISION
NO.
SHEET
NEXT
TM-U950/U950P
Specification
(STANDARD)
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
DC Characteristics (Except Logic-H,
5 V signals)
Specifications
Characteristics
Symbol
Min
Max
Conditions
Output HIGH voltage
Output LOW voltage
Output HIGH current
Output LOW current
V
OH
V
OL
I
OH
I
OL
*2.4 V
-0.5 V
0.32 V
-12 V
5.5 V
*0.4 V
-
-
*IOH=0.32mA
*IOL=-12mA
VOH=0.32V
VOL=0.4V
Input HIGH voltage
Input LOW voltage
Input HIGH current
Input LOW current
V
IH
V
IL
V
IH
V
IL
2.0 V
-
-
-
-
0.8 V
-0.32 mA
12 mA
VIH=2.0V
VIL=0.8V
Logic-H Signal Sender Characteristics
Specifications
Characteristics
Symbol
Min
Max
Conditions
Output HIGH voltage
Output LOW voltage
V
OH
V
OL
3.0 V
-
5.5 V
2.0 V
While the power is OFF
D
17-2
17-3