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5.15 Serial Interface
The PICMG COM.0 specification revision 2.0 defines two optional 2-pin serial interfaces on COM Express® connector
pins A98/A99 and A101/A102 formerly used for 12V VCC input. Both new interfaces are available directly on optional
pin-header J83 and J84.
J78 and J79 allow both interfaces to be used as 2-pin RS232 interfaces COMA and COMB with Kontron Adapter cable
KAB-DSUB9-3. Please check the documentation of your module if this interface is supported and how to configure.
Pin
J78 (COMA)
1
n.c.
2
n.c.
3
RX0
4
n.c.
5
TX0
6
n.c.
7
n.c.
8
n.c.
9
GND
10
+5V
36
COM Express® Eval Type 10 / Connectors and Features
J79 (COMB)
J83 (SER0, A98/99)
n.c.
+5V
n.c.
SER0_TX
RX1
SER0_RX
n.c.
GND
TX1
-
n.c.
-
n.c.
-
n.c.
-
GND
-
+5V
-
J84 (SER1, A101/102)
+5V
SER1_TX
SER1_RX
GND
-
-
-
-
-
-
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