Confidential
EPSON
TITLE
SHEET
REVISION
NO.
SHEET
NEXT
B
RP-U420 series
Specification
(STANDARD)
15
14
2.1.2.2 Switching between online and offline
The printer is not equipped with any online/offline switch. The printer is placed in offline status in any of
the following:
•
When the power is turned on or until the printer becomes ready for data transmission after it is
initialized by the reset signal (nInit) from the interface.
•
In the process of self-test.
•
In the process of paper feeding using the paper feed switch
•
Between the time when the printer stops printing due to a paper-end and when the online recovery
wait time finishes after loading paper (in cases when an empty paper supply is detected by either
the paper roll end detector or the paper roll near-end detector with a printing halt feature set
enabled due for low paper by ESC c 4).
•
When an error has occurred.
2.1.2.3 Compatibility Mode (Data Transmission from Host to Printer)
Centronics compatible
2.1.2.4 Reverse Mode (Data Transmission from Printer to Host)
The STATUS data transmission from the printer to the host proceeds in the Nibble or Byte mode.
•
Description
This mode allows data transmission from the asynchronous printer under the control of the host.
Data transmissions in the Nibble Mode are made via the existing control lines in units of four bits
(a Nibble). In the Byte Mode, data transmissions proceed by making the eight-bits data lines
bidirectional.
Both modes fail to proceed concurrently in the Compatibility Mode, thereby causing half duplex
transmission.