tekmar 482 tN4 Gateway - Manual (Page 9)

9 of 12 © 2012 D 482 - 01/12
General
The following tests are to be performed using standard
testing practices and procedures and should only be carried
out by properly trained and experienced persons.
A good quality electrical test meter, capable of reading
from at least 0-300 V (ac), 0-30 V (dc), 0-2,000,000 Ohms,
and testing for continuity is essential to properly test the
wiring and sensors.
Troubleshooting the Wiring
Test Meter
### Control Terminals
Testing the Control
Testing the Power
1. Remove the front and wiring covers from the control.
2. Use an electrical test meter to measure (ac) voltage
between the Power N and L terminals (1 and 2). The
reading should be 115 V (ac) + / – 10%. The Power LED
should be on.
3. If power is not present the Power LED will be off. Check
the circuit(s) that supply power to the Power N and L
terminals (1 and 2).
Testing the tN4 Buses
1. Remove the front and wiring covers from the control.
2. There are a total of five tN4 buses (tN4 and C). The cor-
responding tN4 LED will be on if there is communication
on the tN4 bus.
3. If there is no communication on a tN4 bus that is supposed
to have communication, there may an open or short
circuit. An open or short circuit will be indicated as a bus
error on any tN4 thermostats, tN4 setpoint controls, and
tN4 system controls.
4. To test for short circuits:
Disconnect the tN4 bus wires on both ends.
Install wire nuts on each wire on one end to ensure the
wire ends are not touching.
Measure for continuity using an electrical meter.
If continuity is present, there is a short circuit fault
along the wires. It is recommended to replace the tN4
bus wires.
5. To test for open circuits:
Disconnect the tN4 bus wires on one end and connect
them together.
Disconnect the tN4 bus wires on the other end.
Use an electrical meter to measure for continuity.
If there is no continuity, there is an open circuit fault
along the wires. It is recommended to replace the tN4
bus wires.
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Testing the RS 232 Serial Port
A terminal shell called Termite can be used to test the RS
232 serial port hexadecimal data.
Step 1: Download the Termite (complete setup) terminal
program for Windows.
http://www.compuphase.com/software_termite.htm
Step 2: Settings
Baud rate = 9600, Data bits = 8, Stop bits = 1, Parity =
none, Flow control = none, Forward = none
Hex View = check marked
Step 3: Enter commands
Hexadecimal values can be entered in the command line
at the bottom. The hexadecimal numbers must be entered
in the format 0x00 followed by a space.
The 482 includes a built-in test routine that transmits a
message via the RS232 port. The result of this is that the
Tx indicator will flash as the message is sent.
Start the test routine by pressing the Test button for 1
second. The Test LED turns red.
Test
The RS232 message includes the following:
1. FirmwareRevision
0xca 0x07 0x06 0x02 0x87 0x01 0x00 0x00 0x6c 0x00
0x03 0x35
This means that the 482 firmware version is 6c hexadecimal
or 108 in decimal.
2. ProtocolVersion
0xca 0x07 0x06 0x02 0x8f 0x01 0x00 0x00 0x01 0x00
0xa0 0x35
The means that the 482 protocol version is 01.
The 482 then exits the test routine and resumes normal
operation.