Comtrol DM ATS-LNX - Manual (Page 15)

PC104 RocketPort Option 15
Connecting Serial Devices
config.flags &= ~ROCKET_MODE_MASK;
config.flags |= ROCKET_MODE_RS485;
ioctl(fd, RCKP_SET_CONFIG, &config);
}
For a more detailed example, see the setrocket source code available in the Linux
driver at
ftp://ftp.comtrol.com/RPort/Drivers/PC104/Linux .
Connecting Serial Devices
There is a remote possibility that connecting a peripheral using the wrong
configuration (RS-232 device connected to a RS-422 configured port) could
damage the peripheral. Configure each serial port specifically for the peripheral
that will be connected prior to connecting the peripheral to the ATS-LNX.
Connect your serial devices to the configured ports using the appropriate cables. If
you need to build cables, see
RocketPort Serial Port Connectors on Page 15.
RocketPort Serial Port Connectors
The following subsections illustrate the pinouts for the quad- and octacable
connector types and how to build loopback plugs for testing serial ports.
DB9 Connectors This illustrates
the pinouts for
DB9 quad- or
octacables.
Building Additional
DB9 Loopback Plugs Loopback connectors are DB9 female serial port plugs that you can use to test
serial ports. The ATS-LNX is shipped with a a single loopback plug (RS-232/422)
that corresponds to your quad- or octacable type.
Note: You can run loopback tests with minicom.
Wire the following pins together to build additional plugs or replace a missing RS-
232 loopback plug:
• Pins 1 to 4 to 6
• Pins 2 to 3
• Pins 7 to 8 to 9
Wire the following pins together for an RS-422 loopback plug:
• Pins 2 to 3
• Pins 7 to 8
Pin 1 Pin 6
RS-232
RI
CTS
RTS
DSR
GND
DTR
TxD
RxD
CD
Pin 1 Pin 6
RS-422
Not used
RxD+
TxD+
Not used
Not used*
Not used
TxD-
RxD-
Not used
Pin 1 Pin 6
RS-485
Not used
Not used
TxD/RxD+
Not used
Not used*
Not used
TxD/RxD-
Not used
Not used
* Pin 5 is tied to ground on the board,
but is not used in the cable.
Pin 1 Pin 5
Pin 6 Pin 9
RS-232 Only
(Back View) The RS-232 loopback plug
also works for RS-422.
Pin 1 Pin 5
Pin 6 Pin 9
RS-422 Only
(Back View)