Data-Linc Group MDL500/LR User Manual Download | Manualshive

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It is essential that all instructions contained in the User Guide are followed precisely to ensure proper operation of equipment.

Two-Wire and Four-Wire
Private Line FSK Modems
Full and Half-Duplex Operation

MDL500/MR
MDL500/LR

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Summary of Contents for MDL500/LR

Page 1: ...NICATIONS It is essential that all instructions contained in the User Guide are followed precisely to ensure proper operation of equipment Two Wire and Four Wire Private Line FSK Modems Full and Half Duplex Operation MDL500 MR MDL500 LR ...

Page 2: ...DATA LINC GROUP PN 161 10003 002B Product User Guide ...

Page 3: ...asmitter Output Level 6 Receiver Gain 6 Carrier Detect 7 Chassis Ground 7 Half Duplex Operation Carrier Control 7 Special Instructions 8 MDL500 MR LR Four Wire Long Range Transmitter Receiver Jumpers 8 MDL500 MR LR Four Wire Long Range Carrier Signal Connectors 8 Front Panel LEDs 8 General Operating Notes 9 Non Loaded Transmission Line 9 Loop Back Test 9 AE485 Interface 9 Technical Specifications ...

Page 4: ...DATA LINC GROUP 2 PN 161 10003 002B rev 8 03 MDL500 User Guide ...

Page 5: ...e transmitter to carrier signals having two slightly different frequencies which are identified by the receiver and reconverted to the digital signals The MDL500s are either Master or Remote units and can be used for either point to point or multi point communications The MDL500s are asynchronous serial data communication devices data rate transparent from DC to 9600 baud In multi drop installatio...

Page 6: ...DL500 MR LR Four Wire Special Instructions Installation The MDL500 factory configuration is set for full or half duplex point to point operation with P4 in the B C position The Master and Remote units are both factory configured as DCEs Data Communications Equipment with the jumpers on headers P1 and P2 in the B C position Data into the DB25 is on pin 2 and data out is on pin 3 Also see section 5 ...

Page 7: ...ransformer into a convenient 120VAC outlet Plugging the power in will power up the units there is no On Off switch Operation Point to point full or half duplex operation is usually conducted with the both the Master and Remote MDL carriers on all the time This is achieved by placing the P4 jumper in the B C position which causes the MDL to ignore the RTS line In half duplex multi drop operating mo...

Page 8: ...mal or High Power HP transmitter output The High Power output has six times greater peak to peak transmitted signal and provides correspondingly greater signal to noise ratio High Power transmitter operation is generally preferred in applications involving sliding contacts or in very noisy EMI environments However caution is advised in some cases since High Power carrier signals will result in mor...

Page 9: ...e most common external carrier control signal is through the RS232 port RTS line pin 4 Jumper P4 A B selects this line When an external RTS logic high is asserted the MDL carrier is turned on and a logic low or ground turns the carrier off The MDL RTS line is biased low so that if the RS232 cable is disconnected or the external controlling device is turned off the carrier will go off Selecting jum...

Page 10: ... carrier Facing the connectors the pluggable terminal block on the left is the transmitted carrier and the pluggable terminal block on the right is the received carrier For proper operation both modems must be set to the same four wire configuration Front Panel LEDs There are four LED s on the front panel of the MDL From left to right The first diagnostic LED is Carrier Detect In full duplex mode ...

Page 11: ... clip works very well is placed between pin sockets 2 and 3 of the DB25 on the other MDL500 MR Data sent to the first MDL500 MR will be looped back from the second and appear on the PC screen If the characters are correct the MDL500 MR s are functioning AE485 Interface The MDL500 is also available with an RS485 interface for connection to multiple Remote devices All operating functions and instruc...

Page 12: ... e c n a t s i D r i a p d e t s i w t e l g n i s n o t e e f 0 0 0 8 4 o t p U e r u t a r e p m e T g n i t a r e p O 2 3 0 0 4 1 0 0 F 0 0 6 0 C s t n e m e r i u q e R r e w o P C D V 4 2 e c a f r e t n I C 2 3 2 S R r o f r o t c e n n o c 5 2 B D e l a m e F e l b a t c e l e s r e p m u j E C D E T D m m 5 5 x m m 5 2 r e i r r a c r o f k c o l b l a n i m r e t e l b a g g u l p n o i t...

Page 13: ...ial and workmanship for one year from date of shipment to original user Data Linc Group will replace or repair at our option any part found to be defective Buyer must return any part claimed defective to Data Linc Group transportation prepaid Return Material Authorization If a part needs to be sent to the factory for repair contact Data Linc Group s corporate office and request a Return Material A...

Page 14: ...n Assignment Description Signal Direction 1 Protective Ground Computer modem 2 Receive Data Computer modem 3 Transmit Data Computer modem 4 Request to Send Computer modem 5 Clear to Send Not connected 6 Data Set Ready Not connected 7 Signal Ground Computer modem 8 Carrier Detect Computer modem 20 Data Terminal Ready Not connected MDL500 rear 24 VDC FSK RS 232 MDL500 CD RxD TxD PWR MDL500 front 13 ...

Page 15: ... Guide PN 161 10003 002B rev 8 03 Diagram 3 Illustration of a typical full duplex and half duplex multi drop application connections Diagram 4 MDL500 MR two wire board layout illustrating Jumper settings and test points Not to scale ...

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