Interface Specifications. Epson LQ-510
advertisement
Interface Specifications
Your printer is equipped with an B-bit parallel interface. For specifications on optional interfaces, refer to their manuals.
Pin Assignments for the Parallel Interface
Connector pin assignments and a description of their respective interface signals are shown in the following table.
Signal Return
Pin Pin
1 19
Signal
STROBE
Directior
IN
4
5
6
2
3
7
8
9
10
11
12
20
21
22
23
24
25
26
27
28
29
30
DATA 1
DATA 2
DATA 3
DATA 4
DATA 5
DATA 6
DATA 7
DATA 8
ACKNLG I
BUSY
PE
IN
IN
IN
IN
IN
IN
IN
IN
OUT
OUT
OUT
Description
STROBE pulse to read data. Pulse width must be more than 0.5
microseconds at the receiving terminal.
These signals represent information of the 1st to 8th bits of parallel data, respectively. Each signal is at HIGH level when data is logical 1 and LOW when it is logical 0.
About an 11 -microsecond pulse. LOW indicates that data has been received and that the printer is ready to accept more data.
A HIGH signal indicates that the printer cannot receive data. The signal goes
HIGH in the following cases:
1) During data entry (ea. char. time)
2) During printing
3) When off line
4) During printer-error state
A HIGH signal indicates that the printer is out of paper.
Technical Specifications 8-9
Interface Specifications
8-10 Technical Specifications
Interface Specifications
The column heading “Direction” refers to the direction of signal flow as viewed from the printer.
“Return” denotes the twisted-pair return, 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. These cables should be shielded and connected to the chassis of the host computer and the printer.
All interface conditions are based on TTL level. Both the rise and the 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.
Interface Timing
The figure below shows the timing for the parallel interface.
Technical Specifications 8-11
Interface Specifications
Printing Enabled/Disabled Signals and Control Conditions
The table below shows the relationship between printing being enabled or disabled, the on line/off line status, and the receipt of the data on/off control characters, DC1 or DC3.
ON LINE SLCT IN DC1/DC3 ERROR BUSY
(Indicator on)
(Data on/off control) on line Low (J1 DC1/DC3 High interface) (no effect)
ACKNLG Printing
(Disabled/ enabled)
High/Low Pulsed Enabled ea. char.
(normal cond.) on line High DC1
Recv’d
High High/Low Pulsed ea. char.
Enabled on line off line
High DC3
Recv’d
High
High/Low DC1/DC3 Low
(no effect) (no effect)
High/Low Pulsed ea. char.
High Not generated
Disabled*
Disabled
* While printing is disabled, character data is being received and acknowledged so that the printer can look for another DC1 character, which would allow it to resume printing.
8-12
Technical Specifications
advertisement