Epson TM-L90 Developer's Manual page 92
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Also See for TM-L90:
- Technical reference manual (212 pages) ,
- Service manual (148 pages) ,
- User manual (112 pages)
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Bidirectional communications cannot take place unless all signal names for both sides correspond to each
other.
Connect all signal lines using twisted pair cable. Connect the return side to the signal ground level.
Make sure that the signals satisfy electrical characteristics.
Set the leading edge and trailing edge times to 0.5 m s or less.
Do not ignore nAck or BUSY signals during a data transfer. Ignoring such signals may result in data
corruption.
Make the interface cables as short as possible.
Electrical characteristics
DC Characteristics (excluding logic-H, +5 V signals)
Characteristic item
Output
Voltage
Current
Input
Voltage
Current
LOGIC-H Signal Transfer Characteristics
Characteristic item
Output
Voltage
+5 V Signal Transfer Characteristics
Characteristic item
Output
Voltage
Current
* VO and IOL are not guaranteed during a power off condition.
** No guarantee is offered to VOL and IOL while the power is OFF.
Rev. A
Symbol
Standard
Minimum value
H level
VOH
* 2.4 V
L level
VOL
–0.5 V
H level
IOH
0.32 mA
L level
IOL
–12 mA
H level
VIH
2.0 V
L level
VIL
-
H level
IIH
-
L level
IIL
-
Symbol
Standard
Minimum value
H level
VOH
3.0 V
L level
VOL
-
Symbol
Standard
Minimum value
H level
VOH
* 2.4 V
L level
VOL
-
H level
IOH
-
**
L level
IOL
-
TM-L90 Developer's Guide
Condition
Maximum value
5.5 V
*IOH = 0.32 mA
* 0.4 V
*IOL = –12 mA
-
VOH = 2.4 V
-
VOL = 0.4 V
-
0.8 V
–0.32 mA
VIH = 2.0 V
12 mA
VIL = 0.8 V
Condition
Maximum value
5.5 V
2.0 V
During power off
Condition
Maximum value
5.5 V
*IOH = 0.32 mA
**
-
During power off
0.32 mA
VOH = 2.4 V
-
During power off
Interface And Connectors A-7
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