Cisco Network Building Mediator 2500 and 5000 Hardware Installation Guide
Troubleshooting
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Troubleshooting

Table Of Contents

Troubleshooting

Panel Checklist

Wiring Checklist

Mediator Diagnostics

RS-485 Troubleshooting Guidelines

Contacting the Cisco Technical Assistance Center


Troubleshooting


This chapter provides troubleshooting instructions for the Mediator and includes various checklists and guidelines. This chapter includes the following sections:

Panel Checklist

Wiring Checklist

Mediator Diagnostics

RS-485 Troubleshooting Guidelines

Contacting the Cisco Technical Assistance Center


Note If you are unable to resolve a problem with the product, contact the Cisco Technical Assistance Center (TAC) for assistance and further instructions.


Panel Checklist


Caution Do not open or remove the chassis cover or operate the unit without the cover installed.
Do not remove or reapply the thermal conductive pad that connects the heat sink to the CPU. Improper thermal pad contact can cause the CPU to overheat and produce intermittent failure. Removal of the thermal pad can cause the CPU to shut down.


Note Before you begin the installation, complete the panel checklist listed in Table 5-1.


Table 5-1 Mediator Panel Installation 

Description
Expected
Actual (Yes/No)
Remarks

Panel Location - Height from floor level.

1.5 m

   

Panel accessibility at the front - when the door is opened.

1.0 m

   

Isolation distance from any RF/EMI generators (VFD).

3 m

   

Recommended power source.

110 V AC (Optional)

   

Voltage check L-N & L-E.

110 V AC

   

Earthing check N-E.

< 3V AC

   

Panel earthing.

Connect to Soft/UPS earth

   

Cable entry to the panel.

Bottom / Top

   

Surge Protection for

RS-485 wiring.

Yes

   

Wiring Checklist


Note Before you begin the panel wiring termination, complete the checklist in Table 5-2.


Table 5-2 RS-485 Wiring

Description
Expected
Actual (Yes/No)
Remarks

Shielded Twisted pair cable with ground used.

Yes

   

Core is 1.5 sq. mm.

Yes

   

Multi-drop systems is daisy chained.

Yes

   

Surge arrestors are used for wiring that runs across multiple buildings.

Yes

   

Mediator Diagnostics

Table 5-3 lists the Mediator diagnostics.

Table 5-3 Diagnostics 

LED Code
Status
Description

Power LED

None

Power off

The Mediator is not powered on.

Solid Yellow

Power on

The Mediator is powered on.

Status LED

White flashes

Idle

The Mediator is booted up and running, but the framework is not running.

Continuous green flashes

Installing

The Mediator Framework is being installed.

Short blue flashes

Configuring

The Mediator Framework is being configured.

Blue flashes

Initiating

The Mediator Framework is starting for the first time.

Continuous short and long green flashes

Running

The Mediator Framework is running.

Continuous red flashes

Error

The processors are not communicating with one another.

None

Off

The co-processor firmware is not loaded.

Sequential red, green, and blue flashes

Installing

The co-processor firmware is being loaded.


RS-485 Troubleshooting Guidelines


Note Use a digital multimeter (DMM) for testing voltage, resistance, and RS-485 communications.


Ensure that RS-485 `A' and RS-485 `B' lines are twisted together to reduce the induced noises from the external sources which affects both lines equally.

Test the remote terminator by disconnecting the cable from the Mediator and all the other devices and ensure the resistance between line A and B is approximately 120 ohms.

Make sure that the remote device is disconnected. (See Figure 5-1.)

Ensure that the shield of twisted pair cable is connected to the ground to reduce the noise levels. (See Figure 5-1.)

Figure 5-1 Shield of Twisted Pair Cable

Ensure that the Mediator side RS-485 cable resistance between A and B is 120 ohm. And, make sure that Mediator is disconnected when the resistance is 120 ohm. (See Figure 5-2).

Figure 5-2 Resistance - 120 ohms

The voltage between line A and ground should be between - 7V to + 12 V and the voltage between line B and ground should be -7 V to +12 V. The voltage between line A and B should be minimum 200 mV. (See Figure 5-3.)

Figure 5-3 Minimum Voltage Between A and B

Add a fuse-type device to the shunting-type suppression to protect against short circuits to power conductors.

Use appropriate signal grounds. Ensure to have shielded cable for desirable safety.

Check the device communication characteristics before completing the system design.

Get a schematic of each serial port to assist in troubleshooting and repairs.

Contacting the Cisco Technical Assistance Center

If you are unable to resolve a problem after using the troubleshooting suggestions in this chapter, contact the Cisco Technical Assistance Center (TAC) for assistance and further instructions. Before you call, have the following information ready to help your TAC engineer assist you as quickly as possible:

Date that you received the Mediator.

Product serial number (located on the label on the bottom of the Mediator).

Type of software and release number.

Maintenance agreement or warranty information.

Brief description of the problem.

Brief explanation of the steps that you have already taken to isolate and resolve the problem.

For information on steps to take before calling Cisco TAC, see Troubleshooting.

You can reach TAC using the following methods:

See http://tools.cisco.com/ServiceRequestTool/create/DefineProblem.do to create a service request online.

See http://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html to call Cisco TAC at the telephone numbers on this page.

See http://www.cisco.com/en/US/support/tsd_cisco_small_business_support_center_contacts.html to contact the Cisco Small Business Support Center.