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JP5 position
COM #1 Working Mode
1-2
RS-422
2-3
RS-232
Not Inserted
RS-485
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.
Signals Description
COM1_RxD/COM2_RxD: COM port #1 / #2 RS-232 Receive data
COM1_TxD/COM2_TxD: COM port #1 / #2 RS-232 Transmit data
COM1_RTS#/COM2_RTS#: COM port #1 / #2 RS-232 Request to Send handshaking signal.
COM1_CTS#/COM2_CTS#: COM port #1 / #2 RS-232 Clear To Send handshaking signal
COM1_RX+/COM1_RX-: COM port #1 RS-422 Receive differential pair
COM1_TX+/COM1_TX-: COM port #1 RS-422 Transmit differential pair
COM2_RX+/COM2_RX-: COM port #2 Full Duplex RS-485 (RS-422) Receive differential pair
COM2_TX+/COM2_TX-: COM port #2 Full Duplex RS-485 (RS-422) Transmit differential pair
COM1_Data+/COM1_Data-: COM Port #1 Half Duplex RS-485 Differential Pair
COM2_Data+/COM2_Data-: COM Port #2 Half Duplex RS-485 Differential Pair
RS232 Internal pin Header- CN26
Pin
Signal
Pin
1
UART0_232_RX
2
3
UART0_232_TX
4
5
GND
7
N.C.
8
9
N.C.
10
CCOMe-C96
CCOMe-C96 - Rev. First Edition: 1.0 - Last Edition: 1.0 - Author: A.R. - Reviewed by C.M. Copyright © 2021 SECO S.p.A.
JP6 position
Not Inserted
In addition, COM Express modules foresee a maximum of 2 Serial Ports with only Tx and Rx signals
(SER #0 and SER #1).
Signal
These two ports are managed though a single RS-232 transceiver, and the output is
UART1_232_RX
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.
UART1_232_TX
N.C.
N.C.
COM #2 Working Mode
1-2
RS-422
2-3
RS-232
RS-485
45
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