Lon Port; Ethernet Port; Serial Ports; Heartbeat - McQuay MicroTech II Operation Manual

Lon Port

There are two LEDs associated with the Lon port, located below the port. One LED is yellow and the other LED is green.
The yellow LED means the CSM is sending out a L
device on the network is sending a message.

Ethernet Port

There are two green LEDs associated with the Ethernet port, located below the port. The LED marked "100" indicates
whether the CSM is operating at 10 MBPS (Ethernet) or 100 MBPS (Fast Ethernet). It the 00 LED is on, the network
connection is operating at 100 MBPS. Otherwise, the port is operating at 10 MBPS.
The LED marked "ACT" indicates activity on the port as follows:
•
Off – No Ethernet link is made
•
On – Ethernet link is present, but no activity on the LAN
•
Blinking – Ethernet link is present with data activity on the LAN

Serial Ports

The status LEDs for the serial ports are located above the RS-232 and RS-485 ports. They are marked COM1 through
COM6 and correspond to the software configuration of the COM ports. The CSM software has been set to use the
following COM ports:
•
COM1 – Modbus using RS-232
•
COM2 - Optional external modem
•
COM3 – Modbus using RS-485
The yellow transmit LED indicates that the CSM is sending data out the serial port over a communications line to a
connected device. The green receive LED indicates that the CSM is receiving data from a connected device.
Pulse detectors that provide a fixed on time when data is detected on the port drive these LED's. If these LED's are on
constantly, this indicates a problem with the communications channel, such as a shorted wire or reversed wiring.

Heartbeat

The Heartbeat LED is located below the Ethernet Port LED's, and is red. Under normal operation, this LED should blink
about once per second. The blink pattern will differ as station activity increases, but any pulse rate from once per second to
10 blinks per minute usually indicates normal activity. If the heartbeat LED stays on constantly or does not light, contact
the McQuay Controls Support Group at 886-4McQuay (866-462-9829).

Troubleshooting the PC's Connection to the CSM

This section discusses what you can do if you are having difficulty connecting your computer to the CSM over an Ethernet
connection. Always verify that the Ethernet wiring is connected properly. Remember that standard patch cables are used
when connecting through a hub and crossover cables are used to connect directly from computer to CSM.
One of the most common configuration issues is that the computer's IP address and subnet mask are not compatible
(because they are not on the same network) with the CSM's IP address and subnet mask. The subnet masks should be
exactly the same on both devices. The IP addresses cannot be the same on both devices but must be close enough to each
other to be on the same subnet (make the last octet of the PC's IP address one number higher or lower than the CSM's). To
compare the IP addresses and subnet masks, you need to know how to find these network configuration values on each
device. The next two sections of this troubleshooting guide describe how to determine these values.
The most efficient way to prove that the wiring and network configuration of the devices are working is to have your
computer ping the CSM. An Ethernet network utility can eliminate many higher level sources of communication problems.
If you can't ping the CSM, do not try any other forms of Ethernet communications (i.e. the user interface web screens) with
the CSM. If you call the McQuay Controls Support Group for support connecting to the CSM, the first thing they may ask
you is if you can "ping" the controller. For instructions on pinging, see the Pinging the CSM from Your Computer on page
123.
OM 780-2
W message. The green LED means some other L
ON ORKS
W
ON ORKS
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