Epson DLQ-3000 Service Manual page 21

Service Manual
Data transmission timing:
- - - - - -
(-v)
(-v)
(-v)
Start Bt
(-v)
Figure 1-7. Serial Data Transmission Timing
Notes: The value of "T" varies according to the input data.
The word structure of serial data is 1 start bit + 8 data bits + parity (Odd, Even, or none) +
Table 1-13 shows the connector pin assignments and signal functions for the RS-232C serial
interface.
Table 1-13. Signal and Connector Pin Assignments for Serial Interface
I
No. Signal Name UO
Pin
2
20
REV
3
7
CHASSIS GND
Other NC
Note: /n/Out refers to the direction of signa/ f/ow as viewed from the printer.
See Figure 1-7.
Parity Bit
Start Data Bit
I
out
Transmit data.
out Connected directly to the DTR signal.
In Receive data.
Signal ground level.
Chassis GND.
-
Not used. Not connected.
Product Description
T ,,
Start Data Bii
Bit (X-ON)
Description