Connect To The Serial Port - Dell EGW-3200 User Manual

4. Run the security-erase command with the password:
$ sudo hdparm --user-master u --security-erase <password> /dev/sdx
Figure 79. Security erase
Results
When the security-erase is finished, all data on the /dev/sdx disk is swiped (0x00).

Connect to the serial port

Steps
1. Connect suitable DB9 cables to the device COM ports.
● Map COM1 port to /dev/ttyS0.
● Map COM2 port to /dev/ttyS1.
2. Set the control mode as RS232/RS422/RS485 from the BIOS menu. Map the pins according to the following table:
Table 13. DB9 connector pin definitions
Pin Signal name
RS-232
1 DCD
2 RXD
3 TXD
4 DTR
5 GND
6 DSR
7 RTS
8 CTS
9 RI
3. Execute the following command on two systems, where # is the port number corresponding to the port being used:
$ sudo chmod 777 /dev/ttyS#
4. To test COM port loopback, use the following commands.
a. Data receive command:
$ cat < /dev/ttyS#
b. Data transmit command:
$ echo "test" > /dev/ttyS#
NOTE: The port number (#) must be different between data receive and data transmit.
78 Setting Up the Ubuntu Operating System
RS-422
TXD422–
TXD422+
RXD422+
RXD422-
N/S
N/S
N/S
N/S
N/S
RS-485
485DATA–
485DATA+
N/S
N/S
N/S
N/S
N/S
N/S
N/S