RTcom Radio Modems Скачать руководство пользователя страница 18

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system. This results in the messages becoming fragmented, thus confusing the modem into thinking

the end of file has been detected.

The other common problem, in particular with WindowsTM Hyper Terminal, is the way in which is

deals with errors. Should an error occur it attempts to re-establish the link from both ends

simultaneously, something of course that cannot be supported on a half duplex link.

Windows is a registered Trade Mark of the Microsoft Corporation

In summary, the best communication packages are those specifically written for a specific task.

Packages such as Visual Basic can be used to great effect as they give you control over the priorities.

We are able to write customer specific programmes and/or assist you own software engineers.

EMC CONFORMATY

Finished products placed on the market with the EU must be EMC Type Examined. Where applicable

the RTcom-Modems have been Type examined in their own right or contain a Type Examined radio

transceiver module.

Where applicable a Type Examination/ EMC Declaration of Conformity will be attached to this manual.

Copyright Radio-Tech Limited 1998-2000.

All information is given in good faith. Equipment should not be used where failure could result in loss of life or damage

to the environment. No losses can be accepted for errors or omissions contained in this document. It is the

responsibility of the user to confirm licensing and other legal issues.

Revision 2, Issue 1

Содержание Radio Modems

Страница 1: ...User Manual RTcom Universal Global Max and Outback Radio Modems Copyright Radio Tech Limited 1998 2000...

Страница 2: ...RTcom Global and Universal 11 RTcom Outback 12 RTcom Max 12 CONNECTIONS Data and Power 13 CONFIGURATION Operating Modes Table for the RTcom range 14 Data format mode switch 15 Interface mode switch 15...

Страница 3: ...al Global Europa Outback and Max are numerous These include reduced installation cost the ability to cross awkward terrain cross third parties lands cross rivers and operate from moving objects Polled...

Страница 4: ...countries such as the United States also permit unlicensed transmissions under FCC Part 15 but both the power and duty cycle limits imposed make modem operation impractical for reliable operation over...

Страница 5: ...nna size dipole 43cm 17cm 17cm 8cm 8cm Potential users in adjacent channels Message pagers Radio Microphones Radio Amateur on 433MHz Radio Amateurs on 433MHz Message Pages on 458MHz and TETRA on 410 4...

Страница 6: ...rom its own power supply Hence as a rule of thumb we only recommend the use of linear power supplies Similarly where supply interruption is to be protected against we recommend the use of float charge...

Страница 7: ...to a minimum and whenever possible uses the lowest loss cable available Both cables and terminations should always be 50 Ohm impedance Cable bends should no be too tight i e the radius of the bend sho...

Страница 8: ...ower supplies The best form of protection is to use a surge arrestor The arrestor is connected in series with the antenna and the modem and is intended to safely limit the induced voltage However a su...

Страница 9: ...i antenna vertically polarised In polled systems where there is a central base station the base station will need an omni directional antenna However the outstations may still employ a directional ant...

Страница 10: ...w and the dipole can become cumbersome and a compressed dipole helical antenna has to be used Whatever antenna types you choose please ensure that its impedance is 50 Ohms name Gain and Directional Pr...

Страница 11: ...12 24V dc supply RS422 RS485 Interface RS232 interface Links to select 2 4 wire RS485 Mode Switch for Data Rate and data format Channel selection switch Global Only See Table Mode Switch for RS232 RS4...

Страница 12: ...Max Please take care when opening cover Optional Location for Battery Solar 12 24V dc supply RS422 RS485 Interface RS232 interface Links to select 2 4 wire RS485 Configuration Mode Switch Radio Modul...

Страница 13: ...sion All units support 7 and 8 bit ASCII even an odd parity and 1 or 2 stop bits Terminal Number Designation WRT Modem Notes 1 24V dc supply 2 GND Ground 3 12V dc supply 4 GND Ground 5 DTR Optional no...

Страница 14: ...er to ensure that the connections are correctly terminated Normally cables with an impedance 100 Ohms should be used and terminating resistors 120R bwtween A B and Z Y may aslo be required CONFIGURATI...

Страница 15: ...n RS485 RS422 4 On RS232 Interface Mode switch SW2 Note The Europa is fully electronically programmable Europa users should consult the programming toll on the disk provided with the modem Mode SW1 1...

Страница 16: ...s Status LED s are provided to aid use On the Global Universal and Max the top green LED indicates power and the CPU status If all is well this LED will blink at a regular interval The centre amber LE...

Страница 17: ...correct communication errors From experience the latency delay caused by error correction techniques is prohibitive for the majority of applications Further the use of a transmit buffer imposes a fin...

Страница 18: ...t as they give you control over the priorities We are able to write customer specific programmes and or assist you own software engineers EMC CONFORMATY Finished products placed on the market with the...

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