1155
6699
RS232 SERIAL INTERFACE
Female DB9 connector
J1
1 DTR
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 DTR When +VRS232, device is power on.
7 n.c.
8 RTS-O When +VRS232, device is ready to receive data.
9 n.c.
NOTES:
Given the presence of the RS232 standard, logic value “0” is associated with voltage value +VRS232 (corresponds
to a voltage level of between +3Vdc and +15Vdc) and logic value “1” is associated with voltage value -VRS232 (cor-
responds to a voltage level of between -3Vdc and -15Vdc).
DEVICE > PC connection
The following picture shows an example of connections between the device and a personal computer using a 9 pin
RS232 serial connectors:
DEVICE PC
DTR
TXD
RXD
GND
DTR
RTS-O
DCD
RXD
TXD
GND
DSR
CTS
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 serial cable.
26
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