Com Ports #2 #3 Internal Pin Headers - Seco CCHPC-C78-C User Manual

COM ports #2 #3 internal pin Headers

Two other COM ports are realised on HC78 carrier board by using an eSPI Dual UART Controller, Fintek F81214E,
These two additional COM ports are made externally accessible through two multistandard transceivers, which allow using them in RS-232, RS-422
or RS-485 mode. Related outputs are available on an internal 9-pin standard male pin header, p 2.54 mm, 5+4 pin, h= 6mm, type NELTRON p/n
2213S-10G-E06 or equivalent.
COM #2 #3 ports internal pin Header
Pin RS-232 mode
1 COM2_RxD
2 COM3_RxD
3 COM2_TxD
4 COM3_TxD
5
7 COM2_RTS#
8 COM3_RTS#
9 COM2_CTS#
10 COM3_CTS#
JP5 position COM #2 Working Mode
1-2 RS-422
2-3 RS-232
NO jumper RS-485
CCHPC-C78-C
CCHPC-C78-C - Rev. First Edition: 1.0 - Last Edition: 1.0 - Author: S.O. - Reviewed by E.S. Copyright © 2023 SECO S.p.A.
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RS-422 mode RS-485 mode
COM2_Rx+
COM3_Rx+
COM2_Tx- COM2_Rx-/COM2_Tx-
COM3_Tx- COM3_Rx-/COM3_Tx-
GND
COM2_Tx+ COM2_Rx+/COM2_Tx+
COM3_Tx+ COM3_Rx+/COM3_Tx+
COM2_Rx-
COM3_Rx-
Selection of working mode is made using jumpers JP5 and JP6,
which are standard pin headers, P2.54mm, 1x3 pin.
According to the working mode selected via jumpers JP5 and JP6, the pinout of
the connector is as described in the left table.
Please be aware that for proper RS-485 working, the RTS# signals must be
used as a handshaking signal, i.e. it is used to control the data flow direction.
When RTS# signal is driven low, then the RS-485 port is in receiving mode, when
RTS# signal is driven high then the RS-485 port is in transmitting mode.
JP6 position COM #3 Working Mode
1-2 RS-422
2-3 RS-232
NO jumper RS-485
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