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35011984 02/2006 33
6
Connecting to a Modbus Plus
Network
Modbus Plus Network Status Indicator
Introduction The Modbus Plus Network Status Indicator displays the status of the Modbus Plus
communications on the TSXCUSBMBP device.
During initial monitoring of the network, the Indicator will flash at approximately 1
time/second. If successful Modbus Plus communications are established, it will flash
more rapidly, approximately 6 times/second. Otherwise, it will flash an error code,
indicating that there is a problem with the connection.
Flash Codes The table below indicates the valid flash codes for the Modbus Plus Network Status
Indicator:
LED Flash Code Description
6 flashes/second The TSXCUSBMBP is successfully receiving and passing the token on
the Modbus Plus network. This is the normal operating mode for a node
on a Modbus Plus network.
1 flash/second
The TSXCUSBMBP is offline, and monitoring the Modbus Plus network to
determine which nodes are active prior to attempting to join the network.
2 flashes, then
pause
The TSXCUSBMBP can hear the token being passed, but never
receives the token.
3 flashes, then
pause
The TSXCUSBMBP cannot hear the token being passed. This is the
flash code to expect if the Modbus Plus cable is not connected to the
TSXCUSBMBP.
4 flashes, then
pause
The TSXCUSBMBP has detected another node on the Modbus Plus
network using the same node address as the TSXCUSBMBP. The
TSXCUSBMBP will remain in this state until it has not heard any messages
from any other node with the same node address for at least 5 seconds.