1155
6699
RS232 SERIAL INTERFACE
DB9 female connector
J3
1 n.c.
2 TX During transmission, takes the values -VRS232 and +VRS232 depending on data
3 RX During reception, takes the values -VRS232 and +VRS232 depending on data
4 n.c.
5 GND
6 n.c.
7 n.c.
8 RTS When “1”, printer is ready to receive data
9 n.c.
SH1 GND
SH2 GND
Given the presence of the RS232 standard, logic value “0” corresponds to the voltage value +VRS232 (voltage value be-
tween +3Vdc and +15Vdc) and logic value “1” corresponds to the voltage value -VRS232 (voltage value between -3Vdc
and -15Vdc.
The following picture shows an example of connection between the device and a personal computer using a connector 6
pin female and a 9 pin RS232 serial connector:
DEVICE PC
RXD
TXD
GND
CTS
TXD
RXD
GND
RTS
DB9
1
2
3
4
5
6
7
8
9
DB9
1
2
3
4
5
6
7
8
9
When use a serial cable, we recommend the installation of a ferrite core on the power supply cable.
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