Rs-232C Protocol - Citizen CLP-6401 User Manual

Citizen systems user's manual printer clp-6401

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6.2.4 RS-232C protocol

(1)

X-ON/X-OFF system (see the figure)

This is a control system in which the data transmission request

signal (X-ON (11H) code) and the data transmission stop request

signal (X-OFF (13H) code) are output.

Requirements of output of X-ON code:

･ When the power is switched to ON.

･ When the remaining buffer is 2K bytes or less, the X-OFF is

output, and the remaining buffer is 4K bytes or more.

Requirements of output of X-OFF code:

･ When printer error occurs.

･ When the remaining buffer is 2K bytes or less.

Note:

Receive buffer size = 32K bytes

Receiving data

X-ON code output

Even if each code is ready for output, the same code cannot be

transmitted twice successively (except when the power is turned on

or the printer is reset from the control panel).

Fig. Buffer in use

4K bytes

2K bytes

X-OFF code output

6-9

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