2. INTERFACES
FT190S
2 - 1
2.1 RS232 SERIAL
The printer has an RS232 serial interface and is connected using a 25-pin
female connector. The communication signals used for serial protocol are TXD,
RXD and RTS (if the RTS/CTS protocol was selected) or TXD and RXD if the
XON/XOF protocol was selected.
Given below are the signals present on the connector:
PIN
SIGNAL
DIRECTION
DESCRIPTION
1
NC
-
2
TXD
Outpu
Data transmission
3
RXD
Inpu
Data reception
4
RTS
Outpu
Same as DTR signa
7
SG
-
Ground signal
(Fig.2.1)