MODELS 5941D1, 5941SD1, 5942D1, & 5942SD1
INSTALLATION PROCEDURE
1. Model 5942 and Model 5942S ONLY - Before connecting power, secure an earth ground wire to the ground stud
on the side of the unit. The ground stud has two nuts attached. The two nuts are used for attaching the ground wire.
Place the ground wire between these two nuts and securely tighten the nuts together.
2. Connect the Link to the communication port of the IED. Check the IED configuration to be sure of the correct
function and direction (signal flow) of each circuit. Typical connections are shown in the following table.
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ÎNote: The Link does not use nor require the connection of these functions for its own operation.
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ÎNote: The Signal Common pin (pin 5) of the Link is shared among all the channels.
LINK
Pin #
Function
Typical DCE
Connection
Handshaking
Typical DTE
Connection
Handshaking
IRIG-B
Connections
Contact Connections
1 Channel 1 Input Transmitted Data (TD) Transmitted Data (TD) Transmitted Data (TD) Transmitted Data (TD)
2 Channel 2 Input Clear To Send (CTS) Request To Send (RTS) Sensed Contact
3 Channel 3 Input Data Set Ready (DSR)
Data Terminal Ready
(DTR)
IRIG-B Clock Input Sensed Contact
4 Channel 4 Input Sensed Contact
5 Signal Common Signal Common Signal Common Signal Common Signal Common
6 Channel 1 Output Received Data (RD) Received Data (RD) Received Data (RD) Received Data (RD)
7 Channel 2 Output Request To Send (RTS) Clear To Send (CTS) Driven Contact
8 Channel 3 Output
Data Terminal Ready
(DTR)
Data Set Ready (DSR) IRIG-B Clock Output Driven Contact
9 Channel 4 Output Link Status Indicator* Link Status Indicator* Link Status Indicator*
Driven Contact or
Link Status Indicator*
* If Switch 1 Ch4 is set for Sync (Not Factory Default)
3. Connect the Fiber Optic Cable (FOC).
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ÎNote: The FOC must connect a “T” optical port of one Link to the “R” optical port of the other Link. Both fibers must be
the same length. The use of duplex fiber is recommended.
4. Connect the power source to the Link.
• Check the voltage rating next to the power connector - verify that it matches the power source
• Remove the plug portion of the power connector by loosening the two captive mounting screws
• Strip back 1/4" off the insulation of the wires that will connect the unit to the power source
• Insert each conductor firmly into a terminal hole of the plug (note: this connection is not polarity sensitive)
• Visually inspect that no strands of wire are straying out of the hole, potentially shorting to ground or to the other
conductor. Tighten the saddle screws until secure
• Re-insert the plug into the power connector and secure the two captive mounting screws
5. Connect the power leads to the source. (The input is non-polarized). The unit is now powered.
6. Immediately upon both links being energized, the “POWER ON” and the “SYNC” LEDs will illuminate “steady”.
7. The Links and the optical circuit are now fully operational. The ”CH.1 T”, ”CH.2 T”, “CH 3 T” and the “CH.4 T” LEDs
will illuminate when the Link is transmitting optical signals. The “CH.1 R”, “CH.2 R”, “CH 3 R” and “CH. 4 R” LEDs
will illuminate when the Link is receiving optical signals.
WARNING
WHEN INSTALLING A MODEL 5942 OR 5942S LINK, AN EARTH GROUND (MINIMUM 14 GAUGE WIRE,
UPTO 5 FOOT LONG) MUST BE ATTACHED TO THE GROUND STUD ON THE SIDE OF THE CASE BEFORE
CONNECTING POWER. FAILURE TO FOLLOW THIS PROCEDURE MAY RESULT IN ELECTRICAL SHOCK
TO PERSONNEL.
3-40-0012-01 Printed in USA
TESTING
One or Two Links can be used for testing. Links may be statically tested without being connected to IEDs as follows:
1. Connect the Links as described in the installation instructions steps 1, 3, 4, 5 and 6 or connect a short length of
simplex fiber cable from the T to the R receptacle of the unit to test.
2. Instead of connecting an IED for the signal and control source described is Step 2, a 9volt battery can be connected
to the “local” Link and a dc volt meter connected to the “remote” Link. Connect the battery (-) terminal to Pin 5 of the
“local” Link and the meter (-) lead to Pin 5 of the “remote” Link or pin 5 of the local link if Loopback is used.
3. With the Links connected and synchronized, “SYNC” LED on steady, test per the following table:
At The Local Link At The Remote Link*
or If Loopback is used the Local Link*
Apply (+) 9 Volts to LED Illuminates Meter Reads > (+) 5 Volts on LED Illuminates
Pin 1 CH1 T Pin 6 CH1 R
Pin 2 CH2 T Pin 7 CH2 R
Pin 3 CH3 T
Pin 8**
CH3 R
Pin 4 CH4 T Pin 9 CH4 R
*The meter will read > (-) 5 volts until the signal is applied to the Link at the “local” end.
**If Switch 2 CH 3 is set for IRIG-B (not factory default) Pin 8 will read ~0 volts
until the signal is applied at the “local” end
4. Next, if channel 4 is not used for data, open the switch access on the top of the Link and set switch 1 to the sync
position. Then connect the meter to pin 9 of the “remote” Link. The meter should read >(+) 5 volts while the Links are
synchronized. With the meter still connected, disconnect one of the fibers. The “Sync’ LED turns off and the meter
reads >(-) 5 volts.
5. Interchange the “local” Link with the “remote” Link and re-test; following all the above steps if two links are used.
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ÎNote: Dynamic functional testing can only be achieved by using an IED connected to each Link. This allows full
communication dynamics to verify system operation including data passing, control and timing.
TROUBLESHOOTING
If the optical link does not operate properly, use the following check list:
1. Are both Links powered properly? - Are “POWER ON” LEDs illuminated?
2. Is the “SYNC” LED off? (Links are not synchronized)
• Check the FOC connections - Are both fibers connected “T” to “R” - not “T” to “T” nor “R” to “R”?
• Are both Fibers the same length (within a meter)?
• Check FOC and terminations for continuity
• Consult factory
3. Is the “SYNC” LED on steady? (Links are synchronized)
• Check the Channel “T” LEDs of the local Link - are they illuminated?
• NO - Re-check connections to IED for function and signal direction (Input Vs Output)
• YES - Are the corresponding Channel “R” LEDs of the remote Link illuminated?
• NO - Consult factory
• YES - Re-check connections to IED for function and signal direction (Input Vs Output)
4. Are the IEDs set at the same baud rate?
5. Are all the IEDs logic and control functions satisfied? - Check IED’s “Description Of Operation”
6. Consult Factory - Please have the IED instruction book available along with your connection diagram to the Link.
DO NOT ATTEMPT TO DISASSEMBLE LINKS AS THERE ARE NO SERVICEABLE PARTS WITHIN.
THIS ACTION WILL VOID THE WARRANTY.
25 Commerce Way #1 North Andover, MA
01845
Phone 978-688-8807 • Fax 978-688-8771
IS5941 • Rev AD
www.dymec.com
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