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2070-9x User’s Manual

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FSK Expansion Block Diagram

PRELIMINARY

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Summary of Contents for 2070-9D

Page 1: ...2070 9D 2070 9A 2070 9B 2070 9E USER S MANUAL 33 6K SMART MODEM June 11 2009 PRELIMINARY...

Page 2: ...his data to any unauthorized person without the prior written consent of GDI Communications LLC Recipient further agrees not to incorporate these drawings specifications or technical information in wh...

Page 3: ...e connector 6 INSTALLATION 7 Dialup Configuration Switches 7 DISTANCE OR MAXIMUM UNITS PER LINE 9 SYSTEMS WITH NO RTS SIGNAL 9 SYSTEM PROBLEMS ERROR BOOKMARK NOT DEFINED THEORY OF OPERATION 12 DIALUP...

Page 4: ...ansmitted in only one direction at a time FSK Frequency Shift Keying Communication protocol where data is encoded into binary format and represented by different frequencies Host Any DTE device MARK S...

Page 5: ...ting parameters such as speed etc can be configured using industry standard AT commands The serial port has a maximum speed of 115 2 Kbps and is RS 232 and V 24 compatible The 2070 9xx cannot be used...

Page 6: ...s 2 4Kbps 1 2K baud 300 baud The modem will automatically select the best operating speed Speeds are 0 01 Specifications V 34 V 32 bis V 32 V 22 bis V 22A B V 23 V 21 Bell 212 Bell 103 V 33 V 17 V 29...

Page 7: ...llic wire 600 Ohm Modulation Phase Coherent FSK Modulation Frequencies Mark and Space Frequencies have a 1 tolerance Frequency 2070 9A 2070 9B 2070 9E Mark 1200Hz 11200 Hz 19200 Hz Space 2200 Hz 17600...

Page 8: ...ation Port DB9 DB9 Termination Table Pin Signal 7 RTS 4 DTR 8 CTS 6 DSR 3 TXD 1 DCD 9 RI 2 RXD FSK Receive Data RXD Data Carrier Detect DCD Transmit Data TXD FSK on board Indicators Request to Send RT...

Page 9: ...RTS 6 SP1 RTS 7 SP1 CTS 8 SP1 CTS 9 SP1 DCD 10 SP1 DCD 11 SP2 TXD 12 SP2 TXD 13 SP2 RXD 14 SP2 RXD 15 SP2 RTS 16 SP2 RTS 17 SP2 CTS 18 SP2 CTS 19 SP2 DCD 20 SP2 DCD 21 DC Gnd C50 EN 22 23 DC Gnd 24 25...

Page 10: ...odem are located on the top of the main board closer to the front panel Refer to the following table when configuring the modem Dialup Configuration Switches Switch Closed Open 1 DB9 SP2 Dial Up 2 DM9...

Page 11: ...2 wire mode the transmitter output is connected to the Receiver input For further adaptation all of the timing signals can be configured to be half their normal time Switch position 3 reduces the CTS...

Page 12: ...termined by 1 The length of the line 2 The quality of the line 3 The number of units on the line 4 The transmitted signal level We can do anything about the length and quality of the line but we can a...

Page 13: ...the edge connector is pulled up with a 1 0K resistor to 12V so make that nothing is connected to the RTS pin L If you are in a situation where you don t have control of RTS but you have more than one...

Page 14: ...that adjustment The Audio output must be loaded with 600 Ohms and the output level measured across the 600 Ohm resistor You have an adjustment range from 8 to 0 dBm The two other potentiometers on th...

Page 15: ...y descrete components switches and jumpers It also provides a means for making rapid changes to the functionality without increasing the cost to the user There are four switches connected to the PLD w...

Page 16: ...e 8ms of the Mark frequency present on the input for Carrier Detect to activate When the Carrier Detect signal goes active the Receiver will be enabled That Mark signal will also have to be above a ce...

Page 17: ...2070 9x User s Manual 14 Block diagrams Dialup Block Diagram PRELIMINARY...

Page 18: ...2070 9x User s Manual 15 FSK Expansion Block Diagram PRELIMINARY...

Page 19: ...rt on the next page will help find the problem if you decide to fix the model 400 yourself Trouble shooting Sequence chart PROBLEM CAUSE The board is non functioning Power coming into the board or cou...

Page 20: ...User s Manual 17 Waveforms Signal Characteristic Waveform Mark Frequency 1200Hz Space Frequency 2200Hz Soft Carrier Frequency 900Hz Alternating Bit Pattern 1720Hz OSC out OSC out OSC out Audio Out PRE...

Page 21: ...2070 9x User s Manual 18 Symmetry 50 CTS Delay 12ms DCD 8ms Soft Carrier time 10ms RXD RTS CTS RTS DCD Audio In Audio Out Soft Carrier Enable RTS PRELIMINARY...

Page 22: ...ms RTS Recvr Squelch Enable Voltage Measurements For DC Isolated Models TP Measurement tolerance TP13 5vdc 2vdc TP11 5vdc 2vdc TP10 5vdc 2vdc For non Isolated Models TP Measurement tolerance TP13 12vd...

Page 23: ...User s Manual 20 GDICOMMUNICATIONS L L C TRAFFIC EQUIPMENT MANUFACTURER SPECIALIZING IN COMMUNICATIONS 280 I 80 WEST EXIT 1 P O BOX 1330 VERDI NEVADA 89439 TELEPHONE 775 345 8000 FAX 775 345 8010 PREL...

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