Seco Qseven CQ7-D59 User Manual page 45

3.3.13 Serial ports
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According to Qseven specifications rel.2.1, there is the possibility of having a serial port directly on Qseven
This interface (eventually managed by the processor/chipset of the Qseven
of common PCs or consumer peripherals.
For this reason, on CQ7-D59 carrier board has been introduced a multistandard transceiver, which allows using the serial port interface offered by the Qseven
module in RS-232, RS-422 or RS-485 mode.
JP7 position JP8 position Serial Port #0 working
Not Inserted Not Inserted RS-485 Half Duplex mode
Not Inserted Inserted RS-485 Full Duplex mode (RS-422)
Inserted Not relevant RS-232 mode
According to the working mode selected via jumpers JP7 and JP8, the pinout of the connector will be as described in the following table.
Serial port #0 connector - CN29
Signal RS-485 Full
Pin Signal RS-232 mode
Duplex mode
1 N.C. N.C.
2 RxD_0 RX+
3 TxD_0 TX-
4 N.C. N.C.
5 GND GND
6 N.C. N.C.
7 RTS_0# TX+
8 CTS_0# RX-
9 N.C. N.C.
CQ7-D59
CQ7-D59 - Rev. First Edition: 1.0 - Last Edition: 1.1 - Author: S.O. - Reviewed by S.B. Copyright © 2021 SECO S.p.A.
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module used), is at TTL electrical level, i.e. it cannot be used directly for the connection
Selection of working mode is made using jumpers JP7 and JP8, which are standard pin
headers, P2.54mm, 1x2 pin.
Please refer to the table on the left for the selection of working mode of the serial port coming
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out from Qseven connector.
Such a serial port is available on connector CN29, which is a standard DB-9 male connector.
Please consider that RS-232 signals RxD_0, TxD_0, RTS_0# and CTS_0#
are obtained from signals UART0_RX, UART0_TX, UART0_RTS# and
UART0_CTS# coming out from Qseven
Signal RS-485 Half
Duplex mode
If the Qseven
interface in those pins, then serial port #0 on connector
N.C.
CN29 will not be usable, neither in RS-232 nor in RS-
---
485 (Half and Full Duplex) modes.
RX-/TX-
N.C.
GND
N.C.
RX+/TX+
---
N.C.
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card edge connector.
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card edge connector.
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module used doesn't support the UART
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