Note:

❑The column heading “Direction” refers to the direction of signal flow as viewed from the printer.

❑“Return Pin” denotes the twisted-pair return pin to be connected at signal ground level. For the interface wiring, be sure to use a twisted-pair cable for each signal and to complete the connection on the return side.

❑All interface conditions are based on TTL level. Both the rise and fall times of each signal must be less than 0.2 microseconds.

❑Data transfer must be carried out by observing the ACKNLG or BUSY signal. Data transfer to this printer can be carried out only after receipt of the ACKNLG signal or when the level of the BUSY signal is LOW.

Timing chart

BUSY

ACKNLG

DATA

STROBE

0.5 μs (Min.)

0 μs (Min.)

5 μs (Typ.)

0 μs (Min.)

Transition time (the rise and the fall) of every signal must be less than 0.2 μs.

Serial Interface

The printer’s built-in serial interface is based on the RS-422 standard so you can connect the printer to an Apple Macintosh.

Standard:

Based on RS-422

Synchronization:

Asynchronous

Bit rate:

57.6 Kbps/230.4 Kbps

Handshaking:

DTR protocol

Technical Specifications A-11