BECKHOFF CB3052 - Manual (Page 33)

Serial Ports COM2 through COM4 Chapter: Connectors
Beckhoff New Automation Technology CB3052 page 33
3.17 Serial Ports COM2 through COM4
There are three more serial interfaces on the board. Of these, COM3 is available through the power
connector (cf. p. 16). COM2 and COM4 and made available via a 2x5 pin connector each (JST
B10B-PHDSSLFSN, mating connector: PHDR-10VS). However, if the board has a touch screen interface,
COM4 is used internally. On these boards, the COM4 connector is either not populated or it is used for
mouse and keyboard signals (see pinning below). Signals default to RS232 level but can be ordered as
TTL level also.
The port address and the interrupt are set via the BIOS setup.
Description Name Pin Name Description
data carrier detect DCD 1 6 DSR data set ready
receive data RXD 2 7 RTS request to send
transmit data TXD 3 8 CTS clear to send
data terminal ready DTR 4 9 RI ring indicator
ground GND 5 10 VCC 5 volt supply
Alternative pinout of COM-connector when touchscreen feature is present:
Description Name Pin Name Description
keyboard clock KCLK 1 6 MCLK mouse clock
keyboard data KDAT 2 7 MDAT mouse data
reserved N/C 3 8 N/C reserved
reserved N/C 4 9 N/C reserved
ground GND 5 10 VCC 5 volt supply