Chapter 1 Product Description

Rev. A 1-21

1.3.2.3 Optional Interface

Type-B optional interface cards are available.
Reply message ESC/P2 IBM 2390 Plus
Main-Type MT24p,PW106cl10cpi,PRG(W0xxxx)rev MT24p,PW106c110cpi,PRG(W0xxxx)rev
Product-Name LQ-670 LQ-670
Emulation-Type ESCPL2-00 PRPXL24-01
Entity-Type EPSONLQ2 EPSONPRPXL24

1.3.2.4 Interface Selection

The printer has 2 interfaces; the parallel interface and Type B optional interface. These interfaces are
selected manually by Default setting or selected automatically.

1.3.2.5 Manual selection

Out of 2 interfaces can be selected by Default Setting.

1.3.2.6 Automatic selection

The automatic interface selection is enabled by Default Setting. In this automatic interface selection
mode, the printer is initialized to the idle state scanning which interface receives data when it is powered
on. Then the interface that receives data first is selected. When the host stops data transfer and the
printer is in stand-by state for the seconds specified by Default Setting, the printer is returned to the idle
state. As long as the host sends data or the printer interface is busy state, the selected interface is let as it
is.

1.3.2.7 Interface state and interface selection

When the parallel interface is not selected, the interface gets into a busy state. When the Type-B serial
interface card is installed and it is not selected, the interface sends XOFF and sets the DTR signal MARK.
When the optional interface is not selected, the printer sends disable commands to the optional interface.
When the printer is initialized or returned to the idle state, the parallel interface gets into a ready state, the
serial interface sends XON and sets the DTR SPACE and the printer sends enable commands to the
optional interface. Caution that the interrupt signal such as a /INIT signal on the parallel interface is not
effective while that interface is not selected.
1.3.3 Prevention Hosts from Data Transfer Timeout
Generally, hosts abandons data transfer to peripherals when a peripheral is in busy state for dozens of
seconds continuously. To prevent hosts from this kind of timeout, the printer receives data very slowly,
several bytes per minute, even if the printer is in busy state. This slowdown is started when the rest of the
input buffer becomes several hundreds of bytes. At last, when the input buffer is full, the printer is in busy
state continuously.
Table 1-22. Optional Interface