BDM-610000083
Rev L
Chapter 3: Connecting the cpuModule
39
Facing the serial port’s connector pins, the pinout is:
RS-422 or RS-485 Serial Port
You may use the BIOS setup utility to configure the serial ports as RS-422 or RS-485. In this case, you must
connect the serial port to an RS-422 or RS-485 compatible device.
When using RS-422 mode, you can use the serial ports in either half-duplex (two-wire) or full-duplex (four-wire)
configurations.
When using full-duplex in RS-422 mode, connect the ports as shown in Table 20.
In RS-485 mode, the connection of the ports is always half-duplex, as the transceivers’ transmitters are
connected to the receivers internally.
9
7
5
3
1
GND
DTR
TXD
RXD
DCD
GND
RI
CTS
RTS
DSR
10
8
6
4
2
Note
The cpuModule has a 120 Ohm termination resistor. Termination is usually necessary on all RS-422
receivers and at the ends of the RS-485 bus. Termination resistors can be enabled in the BIOS setup utility.
Table 20
Full-Duplex Connections
Port 1
Port 2
RXD+
TXD+
TXD+
RXD+
RXD–
TXD–
TXD–
RXD–
Содержание cpuModules CMA34CR
Страница 3: ...Accessing the Analog World www rtd com ISO9001 and AS9100 Certified CMA34CR cpuModules...
Страница 4: ...iv CMA34CR cpuModule BDM 610000083 Rev L...
Страница 34: ...26 CMA34CR cpuModule BDM 610000083 Rev L...
Страница 60: ...52 CMA34CR cpuModule BDM 610000083 Rev L...
Страница 84: ...76 CMA34CR cpuModule BDM 610000083 Rev L...
Страница 100: ...92 CMA34CR cpuModule BDM 610000083 Rev L...
Страница 102: ...94 CMA34CR cpuModule BDM 610000083 Rev L...