FS-6700
RS-232C interface voltage levels
The voltage levels of the RS-232C signals conform to EIA RS-232C specifications.
FALSE is from 3 volts to 15 volts. TRUE is from -3 volts to -15 volts. Voltages
between -3 volts and 3 volts are undefined. The voltage levels of the RS-422A sig-
nals are equivalent to those of the RS-232C signals except the signals used for
transmission and reception.
Connector configurations
The printer uses a DB-25 connector for the serial interface. Depending on the com-
puter configuration for serial interface, use either of the appropriate configura-
tions. A special cable must be prepared or obtained for the RS-422A configuration
by referring to the diagram (last) below.
RS-232C—for computers with a DB-9 connector
RS-232C—for computers with a DB-25 connector
SG
7
All signals can transmit between the printer and the host
computer to send each signals with a signal ground.
SDA
8
This output transmits asynchronous inversed form of dif-
ferential data from the printer to the computer.
SDB
8
This output carries asynchronous non-inversed form of
differential data from the cmputer to the printer.
DTR [Data Terminal
Ready]
20
This output is used as a buffer nearly-full handshake line.
It is held high (above 3 V) when the buffer can accept more
data.
Table A. 6 Meaning of signals—2/2
Signal
Pin
Meaning
Computer
serial port
(DB-9)
Printer
serial port
(DB-25)
RXD-2
TXD-3
DTR-4
GND-5
DSR-6
RTS-7
CTS-8
2-TXD
3-RXD
4-RTS
5-CTS
6-DSR
7-SG
20-DTR
Содержание Ecosys FS-6700
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