PPC-E4-3354_User_Manual.docx
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Rev 1.0 © 2016 EMAC, Inc.
COM D is an RS232 port. This port offers the RTS and CTS handshake lines.
Table 3
SODIMM Pin#
SoM Pin Name
Processor Pin Name(s)
Function
109
COMC_RTS
RTS2/PC9
RS422/485 Tx Enable
118
GPIO4
ISI_D3/PB23
~RS232 Shutdown
119
GPIO5
ISI_D4/PB24
~RS422/485 Rx Enable
120
GPIO6
ISI_D5/PB25
~RS232 Enable
Table 4 (COM A Pinout) (HDR4)
#
Pin Description for 10-
Pin Header
Pin Description for DB9
Connector
1
DCD
DCD
2
DSR
RxD
3
RxD
TxD
4
RTS
DTR
5
TxD
GND
6
CTS
DSR
7
DTR
RTS
8
RI
CTS
9
GND
RI
10
NC
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Table 5 (COM B Pinout) (HDR3)
#
Pin Description for 10-
Pin Header
Pin Description for DB9
Connector
1
NC
NC
2
NC
RxD
3
RxD
TxD
4
RTS
NC
5
TxD
GND
6
CTS
NC
7
NC
RTS
8
NC
CTS
9
GND
NC
10
NC
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Table 6 (COM C Pinout) (HDR2)
#
Pin Description for 10-Pin
Header
Pin Description for DB9
Connector
1
422/485 TX-
422/485 TX-
2
NC
232 RX, 422/485 TX+
3
232 RX, 422/485 TX+
232 TX, 422/485 RX+
4
RTS
422/485 RX-
5
232 TX, 422/485 RX+
GND
6
CTS
NC
7
422/485 RX-
RTS
8
NC
CTS
9
GND
NC
10
NC
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