Serial Interface; Optional Interface - Epson DFX-8500 Service Manual

DFX-8500

1.3.3 Serial Interface

‰
Synchronization :
‰
Signal level (ELA-232D) :
„
MARK (logical 1) :
„
SPACE (logical 0) :
‰
Word length :
„
Start bit :
„
Data bit :
„
Parity bit :
„
Stop bit :
‰
Baud rate :
‰
Handshaking :
„
DTR=MARK, X-OFF :
„
DTR=SPACE, X-ON :
Note: The DTR signal is MARK and X-OFF code (DC3, 13h) is transmitted when the rest of the
input buffer becomes 256-byte. The DTR signal is SPACE and X-ON code (DC1, 11h) is
transmitted when the rest of the input buffer is regained 256-byte.
‰
Error handling :

‰
Connector :
‰
Connector pin assignment and signals :
Table 1-12. Signal and Connector Pin Assignment (EIA-232D)
Pin No. Signal Name
2 TXD
20 DTR
11 REV
4 RTS
3 RXD
7 Signal GND
1 Chassis
GND
Other NC
Note: * In/Out refers to the direction of signal flow from the printer's point of view.

1.3.4 Optional Interface

Type-B and Type-B level 2 optional interfaces are available (Refer to Table 1-1.).
1-22
Asynchronous
-3Vto-25V
+3Vto+25V
1 bit
8 bit
Odd, Even, Non, of Ignore
1 bit or more
2400, 4800, 9600 or 19200 bps
DTR signal or X-ON / X-OFF
Indicates that the printer cannot receive data.
Indicates that the printer is ready to receive data.
When parity error is detected, the received byte is changed to the
"*" character code. Overrun error and framing error are ignored.
25 pin sub-miniature D-shell connector (female)
In / Out* Functional Description
Out Transmit data.
Out Indicates that the printer is ready to receive data or not.
Out Connected directly to the DTR signal.
Out Request to send. always SPACE level when the printer is
powered on. Pulled up to +12 V via 4.7K-ohm resistor.
In Receive data
- Signal GND
- Chassis GND
- Not used. Not connected.
Refer to Table 1-12.
Rev. B