ZETRON 2000 Series Especificações descarregar pdf (Página 196)

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101

Troubleshooting and Repair Procedures

196 025-9035AA

Alternatively, if you have the Local Connect option, if someone is already using it

(connected & talking to the terminal via serial port) and you try to call by modem, it will

answer and disconnect.

Random Link Failures

• Interruptions (modem link) - do you have call waiting, call forwarding, PBX

interrupt beep, or ANY condition that can break in on a call?

• Ground loops (Local link) - the shield wire should be connected only at one end of

the cable.

• Noise - any high power equipment nearby or on same power lines? E.g., elevator

control equipment, arc welder, power tools. Local link is especially susceptible - is

local serial cable running right next to a source of noise like this?

• RF - is there a lot of stray RF floating around? Usually this will cause other

intermittent problems with the terminal in addition to link problems.

Office Machine Modem will not drop Phone Line

Check that modem's DTR state is active. See above for Hayes 1200 modem settings. Other

modems may use switches, jumpers, or software commands to control the DTR response.

The modem's response to the DTR signal dropping should be “hang up and go to

command state”.

External Modems

Check modem manual for RS-232 connector pinout. Make sure all signals are present,

especially CD, DTR, RTS, and CTS.

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