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2.1.1.3 Interface connector terminal assignments and signal functions

Interface connector terminal assignments and signal functions are described in Table 2.1.1.

Table 2.1.1 TM-T88IIIPrinter Status and Signals

Pin

Signal

Signal

Function

 

 

 

 

number

name

direction

 

 

 

 

1

FG

Frame ground

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

TXD

Output

Transmit data

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

RXD

Input

Receive data

 

 

 

 

4

RTS

Output

Same as DTR signal

 

 

 

 

 

 

 

 

 

 

 

 

 

6

DSR

Input

This signal indicates whether the host computer can receive data.

 

 

 

SPACE indicates that the host computer can receive data, and MARK

 

 

 

indicates that the host computer cannot receive data.

 

 

 

 

 

 

 

When DTR/DSR control is selected, the printer transmits data after

 

 

 

confirming this signal (except when transmitting data by DLE EOT, and

 

 

 

GS a).

 

 

 

 

 

 

 

 

 

When XON/XOFF control is selected, the printer does not check this

 

 

 

signal.

 

 

 

 

 

 

 

 

 

Changing the DIP switch setting enables this signal to be used as a

 

 

 

reset signal for the printer (refer to Section 3.3.3).

 

 

 

 

 

 

 

The printer is reset when the signal remains MARK for

 

 

 

 

 

 

 

1 ms or more. (refer to Section 2.1.1.7)

 

 

 

 

7

SG

Signal ground

 

 

 

 

 

 

 

 

20

DTR

Output

1) When DTR/DSR control is selected, this signal indicates whether the

 

 

 

printer is busy. SPACE indicates that the printer is ready to receive

 

 

 

data, and MARK indicates that the printer is busy. The busy

 

 

 

 

 

condition can be changed by using DIP SW 2-1 as follows (refer to

 

 

 

Section 3.3.3):

 

 

 

 

 

 

 

 

 

 

 

DIP SW 2-1 status

 

 

 

 

 

 

Printer status

 

ON

 

OFF

 

 

 

 

 

 

1. During the period from when the power is

 

BUSY

 

BUSY

 

 

 

 

 

 

turned on (including resetting using the

 

 

 

 

 

 

 

 

 

 

interface) to when the printer is ready to receive

 

 

 

 

 

 

 

 

 

 

data.

 

 

 

 

 

 

 

 

 

 

2. During the self-test.

 

BUSY

 

BUSY

 

 

 

 

 

Offline

3. When the cover is open.

 

 

BUSY

 

 

 

 

 

4. During paper feeding using the paper feed

 

 

BUSY

 

 

 

 

 

 

 

 

 

 

 

 

 

 

button.

 

 

 

 

 

 

 

 

 

 

5. When the printer stops printing due to a

 

 

BUSY

 

 

 

 

 

 

paper-end.

 

 

 

 

 

 

 

 

 

 

6. During macro executing standby status.

 

 

BUSY

 

 

 

 

 

 

7. When a temporary abnormality occurs in the

 

 

BUSY

 

 

 

 

 

 

power supply voltage.

 

 

 

 

 

 

 

 

 

 

8. When an error has occurred.

 

 

BUSY

 

 

 

 

 

 

9. When the receive buffer becomes full.(*1)

 

BUSY

 

BUSY

 

 

 

 

 

 

 

 

 

 

 

 

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TM-T88IIIseries

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Epson specifications TM-T88IIIPrinter Status and Signals, GS a