Tuesday, March 29, 2016

Terminal Does Not Display Anything Or Displays Garbled Characters

Fault Description

After a terminal connecting to the switch S5700S-28P-LI-AC starts, it cannot display anything or displays garbled characters.

Possible Cause

  • The power module of the switch is faulty or the switch is not powered on.
  • The serial interface connecting to the switch is incorrectly configured.
  • The cable between the terminal and switch is faulty or not firmly connected to the serial interface.

Troubleshooting Procedure

  1. Check the power indicator on the switch’s front panel. If the RUN/ALM indicator is On, the power module is working properly. If the power indicator is Off, rectify the fault according to Power Module Failures.
  2. Check whether the parameters of the serial interface are correctly configured.
# Verify that the connection interfaces are configured correctly. Some PCs have multiple serial interfaces and each serial interface has a number. When configuring connection interfaces, you must select the correct connection interface number, as shown in Figure 1.

Figure 1 Setting a connection port
setting-a-connection-port

# Verify that the physical attributes of the serial interface on the PC are the same as those of the console interface on the device, as shown in Figure 2. When the attributes of the console interface on the device are not changed, the details are as follows:
  • Baud rate: 9600
  • Data bit: 8
  • Stop bit: 1
  • Parity check: None
  • Flow control: None

Figure 2 Setting the parameters of the serial interface on the PC
setting-the-parameters-of-the-serial-interface-on-the-pc

3. Ensure that the cable is firmly connected to the serial interface. You can replace it with a new cable to verify whether the cable is faulty.
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