Link / Stepper Driver Tester

Link / Stepper Driver Tester
Link / Stepper Driver Tester
User Manual
The Martin Professional Link / Stepper Driver Tester is an invaluable tool for anybody who
regularly utilizes Martin Professional intelligent lighting products.
The Link Tester allows you to check the XLR serial link for problems quickly and easily. It
also tests the stepper drivers used in Martin products. Both features make it extremely valuable for fast on-site troubleshooting.
Inserting a battery
Power is supplied by a standard 9 volt battery inserted in the bottom of the unit.
1.
Remove the 3 screws from the battery cover.
2.
Connect the battery to the connector pad, ensuring that the polarity is
correct, and rest it in the space provided.
3.
To test the battery, press the test button. If it is okay the red LED marked
’Open Circuit’ will light up.
4.
Replace the cover and 3 screws.
Tips for building a serial link
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Use shielded twisted-pair cable designed for RS-485 devices. Though microphone
cable may work in some situations, it is prone to interference that can cause unpredictable performance. For links up to 300 meters (1000 ft.) long, the recommended cable
is at least 24 AWG, low capacitance, 85-150 ohm characteristic impedance, shielded
cable with 1 or more twisted pairs. For runs up to 500 meters (1640 ft.) use 22 AWG
cable. Use an amplifier if the serial link exceeds 500 meters.
Never use a “Y” connector to split the link. To split the serial link into branches use
a splitter such as the Martin 4-Channel Opto-Isolated RS-485 Splitter/Amplifier.
Do not overload the link. Up to 32 devices may be connected on a serial link.
Terminate the link by installing a termination plug in the output socket of the last fixture on the link. The termination plug, which is simply a male XLR connector with a
120 W, 0.25 watt resistor soldered between pins 2 and 3, “soaks up” the control signal
so it does not reflect back down the link and cause interference. If a splitter is used,
terminate each branch of the link.
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Te s t i n g a s e r i a l l i n k
Carry out the following tests BEFORE applying power to any of the units and BEFORE
connecting a controller to the serial link. Otherwise, damage may occur to the controller.
Insert the male XLR connector closest to the controller into the socket on the top of the
tester. Press and hold the test button at the bottom of the tester. One of the LEDs on the front
of the tester will light up, indicating the following.
•
“SHORT CIRCUIT 2,3 +,-”: Somewhere in the link there is a short circuit between
pins 2 and 3.
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“O.K. TERMINATED”: If no other LEDs are lit, you have a good serial link that is
terminated properly.
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“OPEN CIRCUIT - NOT TERMINATED”: This could indicate a number of possible problems with the link, the most common of which are missing termination or a
break (open circuit) somewhere. It can also mean that termination resistance is too
high.
•
“SHORT CIRCUIT 2,1 +,gnd”: Somewhere in the link there is a short circuit
between pins 2 and 1.
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“SHORT CIRCUIT 3,1 -,gnd”: Somewhere in the link there is a short circuit
between pins 3 and 1.
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“WARNING CONTROLLER TRANSMITTING (MASTER)”: There is a unit
acting as a stand-alone master, transmitting control signals to the link. This problem
MUST be corrected before you attach a controller to the serial link to avoid damage.
Note: “+” and “-” refer to the XLR pin polarity for the Martin RS-485 protocol. DMX-512
Pin polarity is reversed on pins 2 and 3. This does not affect the performance of the link
tester - it may be used equally well with both protocols.
Tr o u b l e s h o o t i n g
This section will help you diagnose and fix any problems revealed by testing.
SHORT CIRCUIT 2,3 +,When this LED lights up it means that there is a short circuit between pins 2 and 3 in one of
the XLR cables, or that termination resistance is too low.
Test part of the link near the middle by unplugging a cable from the data output of one of
the units and plugging it into the tester. If this part of the link tests okay then the short circuit is in the other part, between this point and the controller; otherwise, it is between this
point and the end. Plug the cable back into the unit’s data output.
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Lin k / St epper D r iver Te ster
Move half way down the link in the direction of the short circuit and test again using the
same procedure. Always reconnect the serial link after testing a section. Continue testing
until the faulty cable is located. Replace or repair it and then test the whole link again.
A short circuit will also be indicated if the termination resistor has too small a value: it
should be 120 ohms.
O P E N C I R C U I T - N O T T E R M I N AT E D
This LED lights up for a number of reasons. The most common is no termination at the end
of the link. It can also be caused by too much termination resistance. Check that the termination plug is connected. If so, check that the resistance across pins 2 and 3 is approximately 120 ohms.
If the LED lights up when there is correct termination, then there is probably an open circuit
in one of the cables or units. Track down the problem cable or unit as described under
“SHORT CIRCUIT 2,3 +,-”. Replace or repair it and then test the whole link again.
This LED will light even when both the link and termination is okay if the total cable resistance (Ohms) is a sufficiently high, for example on very long cable runs. If you cannot find
a problem, try adding a second 120 Ohm resistor in parallel to the first one. If the green
LED lights up now the link is good: remove the second resistor and carry on as normal. In
this case it is fine to use the link even if the LED lights.
SHORT CIRCUIT 2,1 +,gnd
This LED will only light if the serial link is properly terminated. It indicates a short circuit
between pins 1 and 2 in one of the XLR cables. Track down the problem cable or unit as
described under “SHORT CIRCUIT 2,3 +,-”. Replace or repair it and then test the whole
link again.
SHORT CIRCUIT 3,1 -,gnd
This LED lights up when there is a short circuit between pins 1 and 3 in one of the XLR
cables. Track down the problem cable or unit as described under “SHORT CIRCUIT 2,3 +,”. Replace or repair it and then test the whole link again.
WA R N I N G C O N T R O L L E R T R A N S M I T T I N G ( M A S T E R )
This LED indicates that a unit in the link is transmitting control signals. This can occur if a
it is set to be a master unit in stand-alone mode. The unit, as well as running its own program, transmits data on the link for identical “slaves” to mimic. If the serial link is then
linked to a controller there will be two conflicting units transmitting data simultaneously,
which can have a detrimental affect. To prevent damage to the units, make sure that the controller is the only device transmitting on the serial link.
Even if you only see the LED briefly, and not regularly, it still means that there is a problem
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in the link and it HAS to be resolved.
The transmitting unit will often be running a program so you will be able to see where it is.
Turn master mode off and set the unit to a definite channel number. You may have to turn
the unit off and then on again to reset it.
If you still see this LED after checking all units, the problem is probably a bad EPROM. To
check this, connect an XLR cable to the tester and go to each unit one at a time. Disconnect
both the data input and output cables and connect the cable from the tester. If you see the
red LED, even if it is only briefly, it shows that the unit is transmitting. Remove the unit
from the link and have it serviced.
If you need to update or replace EPROMs, the software is available from the Martin Professional web site at http://www.martin.dk.
Te s t i n g s t e p p e r d r i v e r s
To test a stepper driver open the unit and find the connector for the driver. Disconnect the
cable going to the motor and plug in the tester. Disconnect the unit from the serial link and
apply power. The row of 4 LEDs will light in one of the following ways.
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LEDs flash in sequence, no LEDs remain steadily on or off: the stepper driver is working correctly.
One or more LEDs remains steadily on or off: the stepper driver is malfunctioning and
must be replaced.
If you find it difficult to see if any of the LEDs remain on or off, connect a controller and set
the effect to its slowest speed. The 4 LEDs will light up in one of the following ways:
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LEDs flash in sequence and reverse order when the driver is moved the opposite way,
no LEDs remain steadily on or off: the stepper driver is working properly.
One or more LEDs remains steadily on or off: the stepper driver is malfunctioning and
must be replaced.
P/N 35000528, Rev. B
This test should be carried out with the slowest movement possible. For pan and tilt motor
drivers, use the fine adjust channels in 16-bit mode if applicable. If the stepper driver tests
okay but movement is rough, check the mirror damper, if any.
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