Confidential

NOTES: 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 0.5 s 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.

2.1.2.4Electrical Characteristics

DC Characteristics (Except Logic-H, +5 V signals)

Characteristics

 

Symbol

Specifications

 

 

Conditions

 

Min

Max

 

 

 

 

Output HIGH voltage

 

VOH

*2.4 V

5.5 V

*IOH=0.32 mA

Output LOW voltage

 

VOL

-0.5 V

*0.4 V

*IOL=-12 mA

Output HIGH current

 

IOH

0.32 mA

-

 

VOH=2.4 V

Output LOW current

 

IOL

-12 mA

-

 

VOL=0.4 V

Input HIGH voltage

 

VIH

2.0 V

-

 

 

Input LOW voltage

 

VIL

-

0.8 V

 

Input HIGH current

 

IIH

-

-0.32 mA

VIH=2.0 V

Input LOW current

 

IIL

-

12 mA

VIL=0.8 V

 

Logic-H Signal Sender Characteristics

 

Characteristics

 

Symbol

Specifications

 

 

Conditions

 

Min

Max

 

 

 

 

Output HIGH voltage

 

VOH

3.0 V

5.5

V

 

Output LOW voltage

 

VOL

-

2.0

V

While the power is OFF

 

 

 

 

 

 

 

 

+5 V Signal Sender Characteristics

 

Characteristics

 

Symbol

Specifications

 

 

Conditions

 

Min

Max

 

 

 

 

Output HIGH voltage

 

VOH

*2.4 V

5.5

V

*IOH=0.32 mA

Output LOW voltage

 

VOL

-

- **

While the power is OFF

Output HIGH current

 

IOH

-

0.32 mA

VOH=2.4 V

Output LOW current

 

IOL

- **

-

 

While the power is OFF

** No guarantee is offered to VOL and IOL while the power is OFF.

TITLE

TM-T88IIIseries

SHEET

NO.

REVISION

 

EPSON Specification (STANDARD)

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Epson T88III specifications Logic-H Signal Sender Characteristics, +5 V Signal Sender Characteristics