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17. Serial port connectors (10-pin COM1, COM2)
These connectors are for serial (COM) ports. Connect the serial port cables
to these connectors, then install the module to a slot opening at the back of
the system chassis.
EMB-H81B Serial port connectors
Pin
Signal
1
DCD (422TXD-/485DATA-)
3
TXD (422TXD+/485DATA+)
5
GND
7
RTS
9
RI/+12V/+5V
NOTES:
•
•
2-24
The serial port cables are purchased separately.
Only COM1 can support RS-422 and RS-485.
COM1
COM2
PIN 1
Pin
Signal
2
RXD (422RXD+)
4
DTR (422RXD-)
6
DSR
8
CTS
10
N.C.
PIN 1
EMB-H81B
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