RTE-V852-PC
USER’ S MANUAL (Rev. 1.10)
11
3.7. SERIAL CONNECTOR [SOCKET BOARD] (J3)
The J3 connector is used for the RS-232C interface, controlled by the UART built into the CPU. The
pins of this connector have a pitch of 2.54 mm, and the pin arrangement is identical to that of the 9-
pin D-SUB RS-232C connector normally provided on the PC/AT when using a push-fit connector with
a ribbon cable. All signals at this connector are converted to the RS-232C level.
The pin arrangement of the J3 connector is shown below, after which the signal assignment is listed.
For details of the wiring of the connection signals when the board is connected to a PC (or host), see
the table in Section 3.20.
1
10
9
8
7
6
5
4
3
2
J3 Pin Arrangement
J3 pin No.
Signal name
Input/output
Corresponding port
1
NC
Input
3
RxD(RD)
Input
P34
5
TxD(SD)
Output
P33
7
DTR(DR)
Note
Output
--
9
GND
2
DSR(ER)
Input
P37
4
RTS(RS)
Output
P35
6
CTS(CS)
Input
P36
8
NC
10
NC
J3 Connector Signals
Note The DTR signal outputs the active level at power-on.
