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Midian TDM-1 Instruction Manual

Transparent or addressable radio data modem
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T
RANSPARENT OR
Features
•
1200 baud modem for point to point to multi-point
communications
•
Simplex or full-duplex operation
•
63 character flow control buffer processor
•
Automatic push-to-talk with front porch key-up delay
•
Carrier/CTCSS busy detect input
•
DB-25 connector houses the electronics
•
RJ-11 connector cable picks up the following:
• battery
• ground
• push-to-talk
• mic audio
• receive audio
• Carrier/CTCSS busy from radio
•
User to provide their own radio interface connector on
free end of RJ-11 cable
COPYRIGHT
MIDIAN ELECTRONICS, INC.
To Order: 1-800-MIDIAN'S
TDM-1
A
DDRESSABLE
INSTRUCTION MANUAL
American Communication Systems
Discover the Power of Communications
TO ORDER – VISIT
2000 MIDIAN ELECTRONICS INC. ALL RIGHTS RESERVED.
Software Version 1.0
2302 East 22nd Street
Telephone: (520) 884-7981
R
ADIO
http://www.ameradio.com
D
M
ATA
ODEM
™
Tucson, Arizona 85713
Fax: (520) 884-0422
5-12-00

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Summary of Contents for Midian TDM-1

  • Page 1 American Communication Systems Discover the Power of Communications ™ http://www.ameradio.com TO ORDER – VISIT  COPYRIGHT 2000 MIDIAN ELECTRONICS INC. ALL RIGHTS RESERVED. Software Version 1.0 5-12-00 MIDIAN ELECTRONICS, INC. 2302 East 22nd Street Tucson, Arizona 85713 To Order: 1-800-MIDIAN'S...
  • Page 2 Midian that the failure of a micro is due to static loss of use or for other consequential loss or damage, application of improper voltages to the damage experienced by the purchaser.

  • Page 3: Table Of Contents

    (0) .......................... 6 ONTINUOUS (H, I, J, K) A ......................6 DDRESSABILITY EATURE TECHNICAL INFORMATION....................7 RS-232 H ......................7 ANDSHAKING ....................7 ODEM TO ADIO NTERFACE Q & A ....................... 7 ROUBLESHOOTING ACRONYMS..........................8 CHEMATIC ICTORIAL TDM-1 v 1.0 5-12-00...

  • Page 4: Installation Instructions

    1.5 to 1.8 kHz. Sending a data file during this time will key the transmitter and generate tone data modulation. PTT out Connect to the radio’s PTT circuit. TDM-1 now has control of PTT and will key the radio whenever data is being Green transmitted. Can usually beconnected to the mic jack.

  • Page 5: Operation

    Upon receipt of the 61 character from the DTE, the TDM-1 will drop the CTS (Clear to Send) line to the DTE, PTT Hang Time 1.5s > halting further data. This is known as hardware flow control. If...

  • Page 6: B) Ptt Hang Time (1.5 Seconds)

    500 msec. In addition, transmitter synthesizer lock time can open collector transistor on the TDM-1. If there is a also be a consideration and can vary from a few milliseconds pull-up resistor in the radio this will not be to 100 msec.

  • Page 7: Technical Information

    Please refer to the instructions for your dumb terminal for more information. Is there any way I can test my TDM-1 to be sure it is okay? Why does everything I type appear on the same Yes, you can perform a loop-back self-test. The TDM-1, as...

  • Page 8: Acronyms

    ------------------ RX Other possibilities include ANI signaling, voice talk-off, etc. ------------------ TX I connected my TDM-1 to a terminal and all I see is the word TEST printing over and over again? What do I do? CTS ------------------ RTS The TDM-1 performs an EEPROM checksum test upon RTS ------------------ CTS power-up.

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