Technical data

Appendix C
Troubleshooting communications
mechanical and electrical issues
C Troubleshooting communications mechanical
and electrical issues
C.1 Troubleshooting communications
Troubleshooting communications and connectivity errorsTable C-1:
Communications and connectivity errors and recommended actions
Q1. Why won't the CPU Module LINK LED come on when connecting to the meter via the Ether-
net?
A1. • The LINK light indicates good electric connectivity between two LAN ports. It also indi-
cates proper polarity in the Ethernet connection.
• When connecting directly: Check to ensure that the Ultrasonic cable (P/N 2-3-3400-079)
cable is properly connected.
• When Using a Hub: When using a hub between the meter and the PC, a straight-through
patch cable is required between the meter and the hub and a straight-through patch ca-
ble is required between the hub and the PC. Do not connect either the meter or PC to the
hub UPLINK port. Most hubs do not allow use of the port immediately next to the hub
UPLINK port when the UPLINK port is used to connect the hub to a LAN.
• Ensure the meter and PC are not plugged in to a hub non-usable UPLINK port. Verify that
the meter is powered up by checking that CPU Module LED 1 is on (either solid red or
green). If the LED is not on, check power to the meter. If the LED is on, check the Ethernet
cable connections.
Q2. My CPU Module LINK LED is on but I can't communicate with the meter using Ethernet.
What's wrong?
Troubleshooting communications mechanical and electrical issues
Operations 117