Diagnostics and Troubleshooting -
178 HC900 Process Controller Installation and User Guide Revision 19
06/14
Ethernet Switch indicators
Table 33 – LED Indications on Ethernet Switch
LED LED State/Color Description
10Base-T port
XMT (upper LED)
LINK (lower LED)
Green (On/Off)
Green (On/Off)
On while a message is being sent from the Main
CPU; otherwise Off.
On while the Main CPU is receiving a message.
Remains On as long as host is present; Off
when the host is removed from the link.
NOTE: These LEDs indicate activity on the communication port, they are
controlled by hardware (PHY chip), not by software.
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