Seco SBC-C41-pITX User Manual page 69

5.2.2 USB-to-Serial port converter modules
Modules with DB-9 connector
Signal RS-232 Signal RS-422
Pin
converter converter
1 DCD# N.C.
2 RX RX-
3 TX TX-
4 DTR# N.C.
5 GND GND
6 DSR# N.C.
7 RTS# TX+
8 CTS# RX+
9 RI# N.C
Ordering Code
VA13-0000-1100-C0
VA13-0000-1200-C0
VA13-0000-1300-C0
VA13-0000-2100-C0
VA13-0000-2200-C0
VA13-0000-2300-C0
SBC-C41-pITX
SBC-C41-pITX User Manual - Rev. First Edition: 1.0 - Last Edition: 1.1 - Author: A.R./S.B. - Reviewed by M.B. Copyright © 2021 SECO S.p.A.
This optional module can be used to convert one of the internal USB ports available on connector CN18 into a serial port,
which can be of RS-232, RS-422 or RS-485 type (fixed configuration).
Depending on the type of serial port needed, different module configurations are available; moreover, the output of the module
can be available on standard DB-9 male connector or on RJ-45 sockets.
All modules type mounts an FTDI FT232R USB-to-Serial UART interface IC; RS-232 converter module then mounts a Serial
Port RS-232 Transceiver with 15kV ESD protection. Instead, the other converters mount and RS-485/RS-422 transceiver.
Signal RS-485
Pin
converter
N.C. 1 DTR#
N.C. 2 CTS#
RX- / TX- 3 N.C.
N.C. 4 RX
GND 5 N.C.
N.C. 6 TX
RX+ / TX+ 7 GND
N.C. 8 RTS#
N.C.
Description
USB to RS232 serial port converter with DB9 connector
USB to RS422 serial port converter with DB9 connector
USB to RS485 serial port converter with DB9 connector
USB to RS232 serial port converter with RJ-45 connector
USB to RS422 serial port converter with RJ-45 connector
USB to RS485 serial port converter with RJ-45 connector
Modules with RJ-45 socket
Signal RS-232 Signal RS-422
converter converter
N.C.
RX+
N.C.
RX-
N.C.
TX-
GND
TX+
In the table on the left are shown the
pinout of DB-9 connector and of RJ-
Signal RS-485
45 socket for all kind of modules.
converter
120Ω termination
N.C.
differential pairs are available both on
N.C.
RS-422 and on RS-485 modules.
N.C.
N.C.
N.C.
RX- / TX-
GND
RX+ / TX+
resistors on
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