38 CMA24BT cpuModule
BDM-610000087 Rev A
Serial Port 1 (CN7) and Serial Port 2 (CN8)
Serial Port 1 (COM1) is implemented on connector
CN7
, and Serial Port 2 (COM2) is implemented on
connector
CN8
. The serial ports are normally configured as PC compatible full-duplex RS-232 ports, but
you may use the BIOS Setup program to reconfigure these ports as half-duplex RS-422 or full-duplex
RS-422 or RS-485. If you reconfigure the ports, you must also select the I/O address and corresponding
interrupt using Setup. Table 11 provides the standard I/O addresses and corresponding interrupts.
Serial Port UART
The serial ports are implemented with a 16550/16750-compatible UART (Universal Asynchronous
Receiver/ Transmitter). This UART is capable of baud rates up to 115.2 kbaud, and includes a 64-byte FIFO.
Refer to any standard PC-AT hardware reference for the register map of the UART.
It is possible to change the slew rate for the UARTs of the cpuModule to allow the serial ports to operate at
higher speeds than 115200 bps. For more information see
Chapter 4 - “Non-Standard Serial Port Modes”
.
RS-232 Serial Port (Default)
The default serial port mode is full-duplex RS-232. With this mode enabled, the serial port connectors must
be connected to RS-232 compatible devices. Table 12 provides the serial port connector pinout and shows
how to connect to an external DB-25 or DB-9 compatible serial connector.
Table 11 Serial Port Settings
I/O Address (hex)
IRQ
03F8
IRQ4
02F8
IRQ3
03E8
IRQ4
02E8
IRQ3
Table 12 Serial Port in RS-232 Mode
Pin
Signal
Function
In/Out
DB-25
DB-9
1
DCD
Data Carrier Detect
in
8
1
2
DSR
Data Set Ready
in
6
6
3
RXD
Receive Data
in
3
2
4
RTS
Request To Send
out
4
7
5
TXD
Transmit Data
out
2
3
6
CTS
Clear To Send
in
5
8
7
DTR
Data Terminal Ready
out
20
4
8
RI
Ring Indicate
in
22
9
9
GND
Signal Ground
—
7
5
10
GND
Signal Ground
—
—
—
Содержание cpuModules CMA24BT
Страница 3: ...Accessing the Analog World www rtd com ISO9001 and AS9100 CMA24BT cpuModules...
Страница 5: ...BDM 610000087 Rev A v...
Страница 6: ...vi CMA24BT cpuModule BDM 610000087 Rev A...
Страница 41: ...BDM 610000087 Rev A Chapter 3 Connecting the cpuModule 31 1 12 V not required for operation of the cpuModule...
Страница 66: ...56 CMA24BT cpuModule BDM 610000087 Rev A...
Страница 87: ...BDM 610000087 Rev A Chapter 4 Using the cpuModule 77...
Страница 88: ...78 CMA24BT cpuModule BDM 610000087 Rev A...
Страница 94: ...84 CMA24BT cpuModule BDM 610000087 Rev A Figure 11 CMA24BTQ1910 Heatsink Edge near PCIe 104...
Страница 96: ...86 CMA24BT cpuModule BDM 610000087 Rev A...
Страница 111: ...BDM 610000087 Rev A Appendix C IDAN Dimensions and Pinout 101...
Страница 112: ...102 CMA24BT cpuModule BDM 610000087 Rev A...
Страница 114: ...104 CMA24BT cpuModule BDM 610000087 Rev A...
Страница 116: ...106 CMA24BT cpuModule BDM 610000087 Rev A...