Measurement Specialties 9116 user manual Checking Module Power-Up Sequence

Pressure Systems, Inc. Model 9116 User’s Manual

Chapter 6

Troubleshooting Guide

6.1Ethernet Module Troubleshooting

6.1.1Checking Module Power-Up Sequence

(1)Proper power to the module should first be verified. If possible, verify that the output of the module power supply is set within the range of 18-36 VDC. This should be nominally set for 24 VDC. Ensure the power supply setting is high enough to compensate for cable voltage drops if long interface cable lengths are used.

(2)Turn module power switch ON and verify the following top panel LED status following initial power-up :

•PWR LED should remain ON

If this LED is not on, all other LED’s will likely also be off. Check the PSI 90DB, remote power supply (8491), or customer provided power supply to ensure the proper voltage (18-36 VDC) is being provided. Also verify that the power pins in the module interface cable are wired as described in Section 2.3.2 and Appendix D

•COL LED will illuminate briefly upon power-up. This gives a visual indication that the LED is functional. Thereafter, the LED should remain OFF.

•Tx LED will illuminate briefly upon power-up. This gives a visual indication that the LED is functional. Subsequent activity on the Tx LED during the power-up

sequence is indication that the RARP/BOOTP protocol is enabled. This will typically occur following the initial busy (BSY) LED cycle and continue until an appropriate RARP reply is received.

•LNK LED will illuminate briefly upon power-up. This gives a visual indication that the LED is functional. Thereafter, the LED will indicate proper connection to an Ethernet hub or switch, and should remain ON.

If this LED is OFF, verify that the module is properly connected to the communications hub or switch. Verify proper power is applied to the hub. Also try connecting the 9116 cable to a different port of the hub. Note that most hubs have similar link LEDs to indicate proper connection to the hub itself. If present, verify that the hub link LED for the pressure scanner and the host computer are both active. If the hub is functioning correctly, verify that the communications pins in the module interface cable are wired as described in Section 2.3.4.1 and Appendix D.

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