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5.8
COM Port Headers
The conga-IC370 provides four COM ports—two ports (COM 1, COM 2) from LPC to UART brigde and two ports (COM 3, COM 4) from the
congatec board controller (cBC).
5.8.1
COM 1 and 2 (RS232/RS422/RS484)
The LPC to UART bridge on the conga-IC370 provides two COM ports—COM 1 and COM 2 . COM port 1 provides RS232 COM port on pin
header X39 or RS422/RS484 COM port on pin header X41. COM port 2 provides RS232 COM port on pin header X40 or RS422/484 COM port
on pin header X42.
Use the BIOS setup menu to select the serial communication standard (RS232, RS422 or RS484) for each COM port. The RS485 mode has Tx
output control and Rx echo cancellation.
Table 37 X39, X40 Pinout Description
Pin Signal
Description
Pin Signal
Description
1
DCD
Data Carrier Detect
2
RXD
Received Data
3
TXD
Transmit Data
4
DTR
Data Terminal Ready
5
GND
Ground
6
DSR
Data Set Ready
7
RTS
Request to Send
8
CTS
Clear to Send
9
RI
Ring Indicator
10
N.C
Not connected
Table 38 X41, X42 Pinout Description
Pin Signal
Description
1
TX-
Transmit data -
2
TX+
Transmit data +
3
RX-
Receive data -
4
RX+
Receive data +
5
GND
Ground
Note
1. If 120 ohm bus termination is required, add a termination resistor to the cable or cable adapter.
2. For 2-wire RS485 (X41 and X42), externally connect pin 1 to pin 2 and pin 2 to pin 4.
X39, X40
Pin 1
Pin 2
X41, X42
