Appendix Binterface - Epson P-40 Operating Manual

APPENDIX B. Interface
There are two types of the P-40: a serial type equipped with a RS-232C inter-
face, and a parallel type equipped with a Centronics interface.
B.1 Serial Interface
[Specifications]
Bit rate: Selected by the DIP switches on the control circuit board.
Synchronization : Asynchronous
Handshaking: The DTR signal must be checked by the host each time a
character has been transmitted to the printer.
Signal levels :
Voltage Logical value
+3 to +18 V Space 0
-—3 to -18 V Mark 1
Data format : Selected by the DIP switches on the control circuit board.
(Interface connector]
6-pin DIN plug
(The length of the interface cable should be kept as short
as possible.)
[Interface signals]
; Signal ati
pin No. vem is Source Description
1
2 DTR | Printer Indicates that the
printer is not ready to
receive data.
3 RXD | Host computer| Data from the host
computer.
4
5 GND Printer control circuit
ground
6
E FG Frame ground.
37