User`s manual

Western Reserve Controls, Inc. 1782-JDC User’s Manual
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Table 4-2 Network Status LED (labeled NS)
LED State Module Status Meaning
OFF No Power / Not on-line JDC has no power or has not completed
the Dup_MAC_ID test.
Flashing Green On-line, not connected JDC is on-line but is not allocated to a
Master.
Green On-line JDC is operating normally.
Flashing Red Connection time-out One or more I/O connections are timed out.
Red Critical link failure JDC has detected an error that makes it
incapable of communicating on the link.
(Bus off or Duplicate MAC ID).
4.2.2 RS232/RS485 LED’s
The JDC also has two (2) RS485 activity LED’s – one for transmit (TX) and one for receive (RX).
Each of these will illuminate when there is data communications active on the respective data
lines.
4.3 RS232/RS485 Connector
The ASCII devices are connected to the JDC via 3-wire communications cable. See your ASCII
device’s User Manual for details on the proper connections.
Table 4-3 RS485 Connector Signals
Pin # Signal Designator
1 Transmit Tx
2 Receive Rx
3 Ground Gnd
4.4 DeviceNet Configuration
DeviceNet specifications provide for a maximum network distances for the main trunk line and
drop lines, depending upon the baud rate used on the network. They are: