Related Manuals for GDI 4xxSA
Summary of Contents for GDI 4xxSA
- Page 1 Model 4xxSA Stand Alone FSK Modem USER GUIDE (TI) 4 Jan 06 GDI COMMUNICATIONS LLC PO Box 1330 280 I-80 Exit 1 Verdi, NV 89439 Phone: (775) 345-8000 Fax: (775) 345-8010 Email: support@sgdi.com...
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Page 2: Table Of Contents
Contents Modem Basics Communication Sequence of Events……………………………………………...4 The Pole…………………………………………………………………………...4 The Response……………………………………………………………………...5 Introduction to the 4xxSA Series of Modems Model 4xxSA Modems…...……………………………………………………….6 The KOD Option………...…………………...……………………………………6 Front, Rear and Bottom Panels…………………………………….…………..7 Front Panel………...………………..……………………………………………7 Front Panel LED’s……………………………………………………………..7 Rear Panel……………………..…………………………………………..……..8 Dual Data Ports…………………………………………………………………8 Copper FSK…………………………………………………………………….8 Power Connections……………………………………………………………..8... - Page 3 Contents…… continued Receiver Squelch Time………………………………………………………9 Carrier Detect………………………………………………………………...9 Load Compensation…………………………………………………………10 KOD Function………………………………………………………………10 KOD Direction……………………………………………………………...10 KOD Delay………………………………………………………………….10 Anti-Streaming……………………………………………………………...10 Data Protocol………………..…………………………………………...……...10 RS232………………………………………………………………………….10 RS422………………………………………………………………………….10 Applications _________ ___11 Half Duplex Operation (2 Wire)……………….………………………………...11 Full Duplex Operation (4 Wire).………………………………………………...12 Modems with the KOD Option Installed………………………………………..13 Internal KOD…………………………………..……………………………13 External KOD……………………………………………………………….13 KOD Applications…………………………………………………………..14 More Applications………………………………………………....15...
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Page 4: Modem Basics
Modem Basics The term Modem is a combination of two words, Modulator and Demodulator. Modem Frequency Shift Keying (FSK) Modems are designed to convert digital data to tone frequencies, this process is called modulation. The frequencies can easily be transmitted via a communication line to the receiving modem. At the opposite end of the communication line the tone frequencies are converted back to digital data by a process known as demodulation. -
Page 5: Communication Sequence Of Events
Communications Sequence of Events For ease of understanding this sequence of events we will limit our discussions to one modem at the TMC and one Remote modem connected to a Controller over a 4 wire system. Note; Transmit and receive pairs are referenced to the “Master” end of a 4 wire circuit, also a modem has a Transmit Section and a Receive Section. -
Page 6: The Response
The Response Receive Transmit Remote Receive Pair Computer Section Section Controller DATA DATA 1. The Controller recognizes its address and prepares a message to be sent back to the TMC computer. Our response message will be sent back to the TMC on the Receive Pair of the 4wire system. -
Page 7: Introduction To The 4Xxsa Series Of Modems
Modems cannot raise or lower RTS or initiate handshaking, the only exception to this rule are the new GDI Modems with an optional installed KOD Module. All copper wire modems (DCE) require RTS to be raised at its data port to start the FSK transmission process over the copper wire. -
Page 8: Front, Rear And Bottom Panels
The 419SA has eight LED’s that gives valuable information about the status of the modem and system operation. Data to FSK Traffic Modem Power Carrier Detect RS422 GDI Communications LLC Front Panel LED’s Power Indicates the modem is receiving power and is paired with the rear panel Power LED. Carrier Detect Indicates that the modem has detected a carrier tone from a far end modem. -
Page 9: Rear Panel
Rear Panel This is where the Data, 2 or 4 wire FSK and Power interface with the modem. Copper Data Ports Power 4W FSK Main 115VAC 60 Hz 200mA RS-232 Data Ports Dual Data Ports Main The modem has single communications channel with Dual RS232 Data Ports (Main and Auxiliary). -
Page 10: Bottom Panel
Bottom Panel Label View GDI Communications RS232 Male Pin-out Half Duplex Switch Actuator Full Duplex Verdi Nevada RTS to CTS Time 12ms Tel. 775 345-8000 Cxr. Turnoff Time 10ms Fax. 775 345-8010 RJ 45 Pin-out (Half Duplex) Local Echo (Full Duplex) Rcr. -
Page 11: Load Compensation
Load Compensation Normally this is set to 600 Ohm to match the line impedance. Switching to High increases the gain of the receiver and is only used when the receive signal is so low it causes data errors. KOD Function Data is used to key the modem On and Off when there is no RTS handshaking from an attached device. -
Page 12: Applications
The DIP Switch diagram below is where the adjustments are made to operate in either 2 or 4 wire mode, note also you can change various timing parameters. The settings shown are for 2 Wire which is Half Duplex operation. GDI Communications RS232 Male Pin-out Half Duplex... -
Page 13: Full Duplex Operation (4 Wire)
The DIP Switch diagram below is where the adjustments are made to operate in the 4 wire mode, note also you can change various timing parameters. The settings shown are for 4 Wire which is Full Duplex operation. GDI Communications RS232 Male Pin-out Half Duplex... -
Page 14: Modems With The Kod Option Installed
Modems with the KOD Option Installed On the Stand Alone model an Optional KOD module can be installed. This module is designed to create RTS Handshaking to control the transmit phase of the modem. The Handshake is only created when data flows in or out of the modems data port, the direction is user defined. -
Page 15: Kod Applications
Modems with the KOD option installed. Note: No KOD option is required for the modem if you use GDI Radios and Fiber Digital Modems as these products are designed to plug and play together. 4xx Preliminary Generic User Guide. 4 Jan 06... -
Page 16: More Applications
More Applications City Hall 4xx Series Modem 2 or 4 Wire to Fiber to Radio GDI Modems = Maximum Capabilities 2 RXD 4xxSA Local Note: 3 TXD Switched to Modem Controller Internal FDM Modems can be switched 5 S.GND Aux Port... -
Page 17: Repeater Applications
Repeater Applications Communications Flow Communications Flow Data Data Data Repeater Cable # IFC-Axxxx 4 S. GND S. GND 4 6 TXD RXD 5 400SA 400SA 5 RXD TXD 6 4 Wire 4 Wire Modem Modem 2 CD RTS 8 2 Wire 2 Wire 8 RTS CD 2... -
Page 18: A Word On Dynamic Range
A Word on Dynamic Range All Model 4xx series modems have 42db of dynamic range based on a 0dBm transmit level into a 600 Ohm load. How far will the signal go? This is a not an easy one to answer and can only be generalized as many factures come into play such as;... -
Page 19: Notes
Notes: Contents of this user guide may not be copied or published without the written consent of GDI Communications LLC, Verdi, Nevada. The contents of this user guide are deemed to be correct at the time of publishing and are offered as a guide only;... - Page 20 Contents of this user guide may not be copied or published without the written consent of GDI Communications LLC, Verdi, Nevada. The contents of this user guide are deemed to be correct at the time of publishing and are offered as a guide only; GDI Communications LLC is not liable for any inaccuracies or omissions.