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2021
congatec
GmbH
PA70m01
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5.8
COM Ports
The conga-PA7 provides two COM ports (X15, X16) on the bottom side. Both ports are routed from the congatec Board Controller (cBC)
through a transceiver (ISL3333) and support RS232, RS422, and RS485.
Table 20 X15, X16 Pinout
Pin
RS232 Signal
RS422 / RS485 Signal
1
GND
GND
2
TXD
TX-
3
RTS#
TX+
4
CTS#
RX+
5
RXD
RX-
Connector Type
X15, X16: 5x1 pins, 1.25 mm pitch (Molex 53261-0571); Possible Mating Connector: Molex 51021-0500
Caution
1. If termination is required, a 120 Ohm termination resistor must be added externally across pin 4 (RX+) and 5 (RX-).
2. For RS485 mode, TX and RX signals must be coupled externally.
Note
1. The port modes can be configured in the BIOS setup menu (default mode: RS232).
2. RS485 mode provides echo cancellation.
3. RS422 and RS485 modes do not provide galvanic isolation.
4. RS485 mode uses Automatic Direction Control and it is based on a delay circuit triggered by the TXD signal. Therefore, a small delay is
present after sending data and before TX output of the transceiver is disabled (typ. 2ms).
5. RS485 mode supports transfer rate 9600kbps or higher. Lower transfer rates are not supported by design.
6. congatec offers adapter cables for the COM port headers. For more information, see Table 4.
X15, X16
Pin 1
