Dell EMC Edge 3200 - Connect to the Serial Port

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 RS-422 RS-485
1 DCD TXD422– 485DATA–
2 RXD TXD422+ 485DATA+
3 TXD RXD422+ N/S
4 DTR RXD422- N/S
5 GND N/S N/S
6 DSR N/S N/S
7 RTS N/S N/S
8 CTS N/S N/S
9 RI N/S N/S
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