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MDS 05-3438A01, Rev. E MDS 4790/9790 Series I/O Guide 21
Diagnostics Connector—J1
A DB-9 (9-pin) connector on the rear panel provides system diagnostics
information. The
DIAGNOSTIC PORT is used to control and perform
diagnostics on the radio system from a connected computer. The com-
munication speed between the computer and radio is up to 38400 bps.
Figure 19 shows the EIA-574 (9-pin EIA-232) pin functions of the
DIAGNOSTIC PORT as viewed from the radio’s rear panel. Connection to
J1 can be made with a DB-9 male connector, available from many elec-
tronics distributors.
Invisible place holder
Figure 19. Diagnostics Port Connector, J1
4-Wire Audio Connector—J2
J2 is a plug-in terminal strip that provides connections for 4-wire audio
circuits. Figure 20 shows the function of each terminal as viewed from
the rear panel.
Terminals 1 and 2 are for transmit audio input with a nominal 600 Ω
impedance. Terminals 3 and 4 provide a receive audio output with a
nominal 600 Ω impedance. Pins 5 and 6 provide a source for an external
keying source. Connecting pins 5 and 6 together keys the radio.
Figure 20. 4-Wire Audio Connector, J2
PIN 2— RXD
PIN 3— TXD
PIN 4— +5 Vdc
PIN 5— GROUND
PIN 7— RTS*
* Used when reprogramming the radio firmware with a PC.
UNUSED
UNUSEDUNUSED
UNUSED
RECEIVE AUDIO
600 OHM
4123 5 6
TRANSMIT AUDIO
600 OHM
EXTERNAL KEYLINE
(GROUND TO KEY RADIO)
- MDS 4790/9790 Series 1
- QUICK START GUIDE 2
- TABLE OF CONTENTS 3
- Copyright Notice 6
- Operational Safety Notices 6
- ESD Notice 8
- Environmental Information 8
- 1.0 INTRODUCTION 9
- 2.0 PRODUCT DESCRIPTION 9
- 2.1 Network-Wide Diagnostics 10
- 2.3 Applications 11
- 2.4 Features 12
- 2.5 Accessories 13
- 3.0 INSTALLATION PLANNING 14
- (Shown mounted to mast) 17
- 4.0 INSTALLATION PROCEDURES 18
- 4.2 Mounting the Radio 19
- Figure 7. Mounting Dimensions 20
- 4.3 Primary Power 21
- ON/OFF SWITCH 22
- DC POWER INPUT 22
- 4.4 Backup Battery 23
- Battery Reset Switch 24
- (See Text) 24
- Duplexer 24
- ANT connector 26
- (Most common arrangement) 26
- TX and RX ports are the only 26
- DATA PORT to prevent damage 28
- Data Interface Connector—J3 30
- Invisible place holder 30
- 5.0 START-UP AND OPERATION 32
- 5.2 Front Panel Indicators 33
- Figure 24. LED Indicators 34
- 6.0 DIAGNOSTICS AND CONTROL 36
- MDS P/N 97-1971A04 37
- 6.2 PC Command Summaries 38
- For example: REPEATER 39
- For example: REPEATER ON 39
- PC COMMAND 42
- FRONT PANEL 42
- MENU DESCRIPTION 42
- STAT (described on Page 52) 43
- Major Alarm Event 45
- Assignments 45
- Alarm Sense ASENSE [HI/LO] 46
- Battery Backup 46
- Monitoring & Alarm 46
- Data Interface Baud 46
- Data Interface 47
- Buffering 47
- Event Log Date 49
- Dekey Transmitter DKEY 49
- Emphasis screen, Page 66 50
- Hardware Revision 51
- Initialize to Factory 51
- Defaults 51
- Manual Key screen, Page 68 52
- Clear Logs screen, Page 75 52
- 4-WIRE AUDIO INTERFACE 53
- Modem screen, Page 65 53
- Alarm Masks screen, Page 71 53
- Options Installed OPT 54
- Owner’s Message OWM [xxxxx] 54
- Owner’s Name OWN [xxxxx] 54
- Received Signal 56
- Strength Indicator 56
- Remote Terminal 56
- Receive Frequency RX [xxx] 57
- Received Data Audio 57
- Receive Pad screen, Page 71 58
- Transmit Timeout screen 58
- Serial Number screen, Page 74 58
- Show Selected 59
- Parameters 59
- Signal-to-Noise 59
- Unit’s Internal 61
- Temperature 61
- Transmit Timeout 62
- Transmit Data Audio 62
- Front Panel 64
- This graphic points you 68
- Table 17. dBm Vs. Watts 73
- Clear-to-Send 74
- Standby 77
- Equipment 77
- Transmit Level 78
- [–20 to +3, AUTO] 78
- Set Owner 80
- 7.0 LOCAL & NETWORK-WIDE 83
- PROBLEM SOLVING 83
- 7.1 Local Problem-Solving 84
- DTYPE ROOT command (Page 42) 88
- DIAGNOSTICS port, an 89
- 8.0 REPLACING ASSEMBLIES 90
- POWER SUPPLY 91
- MAIN TRANSCEIVER 91
- (P/N 28-1575Axx) 92
- Backup Battery 92
- POSSIBLE 94
- EQUIPMENT 94
- 9.0 RADIO SOFTWARE UPGRADES 99
- COOLING FAN 99
- (Keep clear of dust) 99
- AIR FLOW 99
- 9.2 Preparing for Download 100
- 10.0 TECHNICAL REFERENCE 101
- ±1.5 ppm 102
- 10.2 RF Propagation Planning 103
- FProb a b 6.0 10 107
- GLOSSARY 109
- IN CASE OF DIFFICULTY 119
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