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ETIC MR1200 User Manual

1200 bauds
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MR1200
RADIO MODEM 1200 bauds
----------
USER MANUAL
908709-02
(AUGUST 2000)

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Summary of Contents for ETIC MR1200

  • Page 1 MR1200 RADIO MODEM 1200 bauds ---------- USER MANUAL 908709-02 (AUGUST 2000)

  • Page 3: Table Of Contents

    4.3.2. Automatic mode........................31 4.3.3. Marked automatic mode ......................32 4.3.4. Direct mode ..........................32 4.3.5. V25bis mode ..........................33 4.4. R , & CCIR/ZVEI ..........36 ADIO CHANNEL ACCESS USE OF THE TONE DIALLER 4.4.1. Introduction ..........................36 ETIC - MR1200 - USER MANUAL - 908709-02 Page3...
  • Page 4 OWER SUPPLY SAVING SLEEP MODE 4.5.1. Operation ..........................38 4.5.2. Sleep model ..........................38 4.5.3. Transceiver wake up.........................38 4.5.4. Power state up ..........................39 4.5.5. Configuration mode wake up....................39 4.6. S ............................39 PEECH USE Page 4 ETIC - MR1200 - USER MANUAL - 908709-02...

  • Page 5: Introduction

    Introduction 1. INTRODUCTION The MR1200 modem is designed for half duplex data communication over a radio-frequency channel. Connection is made to an external VHF or UHF transceiver. The MR1200 exists in 2 versions: - 1200 b/s version. - 2400 b/s version.
  • Page 6 Minimal power consumption of 50 mA, reduced to 300 µA using the power saving feature. • Durable and compact case housing the data handling/interface card. • Completely configurable from an ASCII terminal, using an elementary set of commands. Page 6 ETIC - MR1200 - USER MANUAL - 908709-02...

  • Page 7: Installation

    Installation 2. INSTALLATION 2.1. Preamble The MR1200 has an IP40 protection index. For outdoor installation therefore it will be necessary to site the modem, transceiver, Data Terminal Equipment, battery and any temperature regulating devices in a clean, dry enclosure. 2.2. External description The MR1200 modem is housed in a metal box.

  • Page 8: Connecting To The Terminal

    Power connector (10 to 16 Volts). 2.3. Connecting to the terminal The MR1200 dialogues with its command terminal over an RS232 (+12V/ -12V) serial link. The connector used is a male, 9-way sub-D whose pinout is as shown : The different circuits carried on the interface are shown in the following table :...

  • Page 9: Choice Of Radio Channel Data Transmission Rate

    2400 baud. 2.5. Power supply connection The MR1200 needs a d.c. power supply voltage of between 10.6 V et 15.8 V. When used on an isolated site a 12V lead battery is an ideal solution. The MR1200 is fitted with a circular, male, power supply connector whose pinout is as shown :...
  • Page 10 = 1.57 kHz = 1200 Hz +0.13 kHz / -0.21 kHz ∆f = 1.04 kHz The pre-emphasis stage is in fact a 2nd-order high-pass filter defining the following relationship : Page 10 ETIC - MR1200 - USER MANUAL - 908709-02...
  • Page 11 Where the T/R has a differential output, the network (R9 + R10 + R15 + C9 + C15) allows such an output to be connected. In this case strap S1 must be moved. Where possible, it is preferable to use the differential mode configuration since it reduces noise. ETIC - MR1200 - USER MANUAL - 908709-02 Page 11...
  • Page 12 A monostable triggered by 105-RTS prevents T/R changeover occurring before data transmission has terminated. DATA MONOSTABLE monostable 100 ms 10 ms min T1= 65 ms max ALTERNAT Soft DATA out ALTERNAT E/R Page 12 ETIC - MR1200 - USER MANUAL - 908709-02...

  • Page 13: The Type Of Connecting Cable To Use

    Once the copper tracks (component side) connecting the S3 pins and those between the S4 pins have been cut, straps are soldered into position as shown below. 2.6.2. The type of connecting cable to use ETIC - MR1200 - USER MANUAL - 908709-02 Page 13...

  • Page 14: Factory Pre-Setting

    Installation The connection between the MR1200 and the transceiver must be made using a short length of multicore screened cable. The screen should be connected to the metal shell of the 15-way sub-D connector. 2.6.3. Factory pre-setting ETIC can deliver modems pre-configured for the chosen transceiver. Interconnection wiring sheets have been produced for most models of transceiver on the market.

  • Page 15: Power Saving Feature Set Up

    - SLEEP MODE 2 : MR1200 asleep, T/R not powered. In this case, power for the T/R is supplied through a relay controlled by the MR1200. Relay operation is described in chapter 4.5.3. Wake up initiated by 108-DTR or by the configuration mode push-button being activated.

  • Page 16: Connecting The Optional Microphone + Loudspeaker Set

    LS signal directly from the output of IC3-D (behind C8), and if necessary increasing the level by modifying the values of R3 and R17 (consult ETIC). The pinout of the female 9-way sub-D connector is as shown :...

  • Page 17: Microphone Connection

    The external microphone signal is amplified and filtered (low-pass filter, IC3-A + C18 + R21 + P3 + C16). If necessary, the signal level can altered by modifying resistor R21 (consult ETIC). 2.9. T/R power supply The transceiver connected to the MR1200 should have an external power source.

  • Page 19: Configuration

    3. CONFIGURATION 3.1. Entering configuration mode Programming or listing the complete set of MR1200 operating parameters may be carried out using a data terminal connected via the serial interface. The terminal must be set up with the following communication parameters : •...

  • Page 20: Quick Configuration

    [Cr] (Carriage Return) or by the [Cr-Lf] (Carriage Return + Line Feed) combination, • The MR1200 echoes all the commands it receives on the terminal screen. It is always possible to cancel this echo if the terminal echoes its keyboard input locally.

  • Page 21: Operating Parameters And Options

    The following paragraphs describe the MR1200 configuration parameters in detail. The default values for MR1200 parameters and options have a * next to them. These are the values assigned when the modem is first switched on or when the "RES1" command is sent.
  • Page 22 (8 bits, even parity, 1 stop) 9600 b/s (8 bits, even parity, 1 stop) (8 bits, no parity, 2 stops) Parameter 012 [mod_ter] Defines the MR1200 control mode used for normal operation, from the 4 possible modes : mod_ter control mode marked automatic simple automatic...

  • Page 23: Configuring The Radio Interface

    900 b/s. Data is transmitted with no extra coding and any errors are no longer filtered on reception. Parameter 021 [tp_alt] ETIC - MR1200 - USER MANUAL - 908709-02 Page 23...
  • Page 24 CCIR short ZVEI 1 ZVEI 2 Parameter 024 [seq_num] Defines the tones to be emitted and/or the protocol used by the MR1200 each time it goes into transmit mode : seq_num format Tone codes: '0' to '9', 'A' to 'E'...

  • Page 25: Operating Parameter

    0 to 255 * 0 (no address) If 0 is entered for this parameter the MR1200 will not use an address when it transmits data. To address data to stations within a transmission network, enter different, non zero addresses for each communicating station.

  • Page 26: Power Saving Feature

    Select a larger size (144 bytes or more) if the radio link is of good quality and the data rate needs to be high. Parameter 035 [f_mem] Alters the MR1200's transmit data buffer size from 32 bytes to 2 Kbytes depending on the application: f_mem buffer capacity...

  • Page 27: Other Parameters

    The value 0000 prevents the modem from going to sleep. 3.4.5. Other parameters Parameter 050 [tp_emi] Fixes a limit to the length of the MR1200's transmission time, serving to avoid both a modem monopolising the radio channel and the risk of transceiver RF stages overheating : tp_emi units...

  • Page 28: Leaving Configuration Mode

    The TR and DP indicators go out, and the modem serial interface is reconfigured with the speed and format parameters set by the operator. Note : Should the operator leave the MR1200 in configuration mode, the unit will automatically revert to normal operation after 5 minutes.

  • Page 29: Operation

    • Call control : 4 control modes enable the terminal to control the modem. The MR1200 then checks the status of the radio channel, turns on a relay if appropriate and finally transmits the data. • Data Communication : Data transmission over the radio channel is half duplex.

  • Page 30: Format And Coding

    (tp_ae parameter), when there is no more data to be sent. The MR1200 stays in the receive state while data is incoming, reverting to transmission at the end of a second configurable time delay if the terminal has new data (tp_ar parameter).

  • Page 31: Modem Control Modes

    If transmission time limits have been set, long messages should be segmented and sent by the terminal in several batches, otherwise data may be lost. modem memory capacity The size of the MR1200's transmit buffer can be increased from 32 bytes up to 2 Kbytes depending on the application. 4.3. Modem control modes 4.3.1.

  • Page 32: Marked Automatic Mode

    Operation Data transmission When there is data to be sent the terminal transmits it to the MR1200. On reception of the first data byte an attempt is made to access the radio channel (see § 4.4). If transmission is momentarily inhibited, the MR1200 will delay data output for several seconds.

  • Page 33: V25Bis Mode

    Line 106-CTS is also set ON enabling the terminal to reply with its data. Termination of radio communication The MR1200 returns to its rest state after the pre-configured time delay, once 105-RTS is set OFF AND data transfer has been concluded (parameter tp_rc).
  • Page 34 CCIR/ZVEI tone encoder (the CCIR or ZVEI standard is selected with st_num parameter). Refer to § 4.4 for the use of this command. Page 34 ETIC - MR1200 - USER MANUAL - 908709-02...
  • Page 35 CCIR/ZVEI call sequence. If the command sent is incorrect the reply is : INV. Otherwise, the MR1200 sets ON 106-CTS, and attempts to access the radio channel (see §4.4).

  • Page 36: Radio Channel Access, & Use Of The Ccir/Zvei Tone Dialler

    4.4. Radio channel access, & use of the CCIR/ZVEI tone dialler 4.4.1. Introduction Two elements comprise the MR1200 "tone dialling" system : the radio carrier detection circuitry and a tone encoder conforming to CCIR or ZVEI standards. This system can be programmed to : •...

  • Page 37: Radio Relay Control

    Equally, the terminal can transmit a call sequence for the MR1200 to execute without there being any subsequent data (CCIR or ZVEI pager calling). The syntax is then: CRN/ss...s...

  • Page 38: Power Supply Saving (Sleep Mode)

    4.5.2. Sleep mode When inactive, the MR1200 drops into sleep mode after a configurable time delay of between 1 second and 60 minutes (att_ina parameter). If one of the above events occurs before the time-out, the modem remains awake and the countdown is stopped..

  • Page 39: Power State Up

    Operation 4.5.4. Power up state When the MR1200 is first powered, or repowered after a loss of supply, it remains awake until after the first radio communication has taken place. 4.5.5. Configuration mode wake up Operating the configuration push-button switch will cause the modem to wake up so that its different operating parameters can be programmed.

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