Guardian Technologies DVST Connecting a modem in direct mode, Call request, Call answer request

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Modems

DVST Installation Guide

7.5Connecting a modem in direct mode

This mode uses a modem in a ‘dumb’ mode, and purely relies on the hardware control lines. Telephone number selection, and all other configuration must be performed at the modem.

The modem is controlled using DTR (Data Terminal Ready), and indicates it’s status using DCD (Data Carrier Detect).

Note: This mode is not recommended, easier operation is achieved in ATMODE.

Call request

A call is requested by making DTR active (high). At this point the MODEM dials it’s stored number, and attempts to establish the call with the remote end. When the call connect has been completed the modem raises it’s DCD line, confirming it is connected with the remote location.

A call already being active is indicated by the DCD line being active (high) from the

MODEM.

Call answer request

If a call is incoming, the modem answers the call, establishes the physical link, and then raises DCD to inform the DVST unit that a call is present. The DVST unit responds to this by taking DTR active (high).

Call disconnect.

This is requested by dropping the DTR signal. A successful disconnect is confirmed by the DCD line being dropped by the MODEM. In this mode the DTR line remains low.

Configuration of modem in direct mode

No configuration can be performed by the system, however the following are required of the modem :

Select synchronous operation.

Dial stored number on low to high transition of DTR.

Disconnect on a high to low transition of DTR.

DCD must follow remote carrier.

Ignore DTR to answer.

Auto-answer. ( If required ).

No flow control enabled.

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Dedicated Micros Ltd

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Contents Page Page Installation Guide DFT-0150Page Safety Page A. and Canadian Models Only Regulatory NotesFCC and DOC Information CE MarkPage Table of Contents Demonstration Mode ModemsCalls Terminal AdaptersLeased Line Transmission Images and TransmissionAudio Alarms & EventsGlossary Returns Procedure Cable AssembliesDFT-0150 Transmitter Event monitoring Alarms1Introduction TelemetryPage Items in packing Unpacking the unitPacking the Dvst Page 3Operation Alarms FeatureCallback Track Last Alarm Freeze All AlarmsOffline Frozen Alarm No Frozen Images4Installation Rear Panel connectionsPower Inputs 37 Way Alarm ConnectionsSetup using a PC 5SetupWhat you require Remote Setup Dvst CommandsDefine Camera Inputs Auxiliary PortSet Port usage Each field entry is separated by a space. If Default settings AUX1 N 38400Define Auxiliary Ports 1,2 AUX2 N 38400Demonstration Mode Demonstration modeDemo Cable Tech NoteConnecting the demo cable Single cable operationPage 7Modems Modem CommandsPstn Connection Modem MBAUD= Set Modem port Async baud rate. default 9600, 19200 ModemModem configuration strings MODSTR= Set type of modem Fast or Sync default, FastUSER=... Available for user configuration Default, blank Zyxel US Modems OnlyModem Operation Default, AtdtModem dial string Call request Connecting a modem in direct modeConfiguration of modem in direct mode Call answer requestUsing a modem in Atmode General settings for modems in AtmodeAll modems Action required of Modem Possible AT settingsModem Requirements Synchronous ModemsCountry specific settings MINIT=AT&M1 &D2 &C1 *FLO *OC1 *DTO *DE12 *AA1User=ATX3*BDO&Y1&W1 Where No DialtoneTransmission speed AT*MXnDIP Switch Settings Synchronous Operation Syncronous modeMicrocom Async mode TrailblazerSend RET Octocom OSI 8196AModem RET Modems Dvst Installation Guide This page intentionally blank Isdn Connection Terminal Adapter Default, onTerminal Adapters Sets dual Isdn support on or OFFMaking a Call Connecting a terminal adapter in direct modeConfiguring a Terminal Adapter for direct mode operation Answering a CallGandalf TA1 Direct ConnectionStep Instruction Ascom 5000 / CitamRemarks ISDN=ATMODE RET DUALISDN=ON RET Isdnstr = Citam RET ISDN0 RET Atret AT&WRET, ESC ISDN1RET AtretStep Instruction Remarks X21AT&WRET ESC Quit RET ‘CONF’‘DIPS’ ‘CHNG’ISDN=ATMODE RET Dataflex TAQuit RET Leased Line Transmission Dvst set up for leased line operationLEASED= Leased line operation, options are default, OFF Leased line terminologyLeased line operation SET UP RX or Slave END SET UP TX or Master ENDAscom 64000 Baseband Modem Page Set telephone entry n password to PasswordsPASSWORD= Set system password to 10CallsOn Screen Titling Set telephone entry n to Telephone Number Entries / Connection CommandsDefault, blank FormatDefault, 30 seconds Call connection timeout periodDefault, 60 seconds CALLBACK= Set call back on or OFF Default, offImage size CAMLO=Sets low resolution cameo operationImages and Transmission Target Picture SizesPage Alarm Settings Alarms & EventsAlarm Connections Purpose & intended useSet contact nn normally open Images transmitted on alarmSet contact nn normally closed Default is Auto Set alarm outputs Auto / ManualALMODE= ...Set Alarm operation mode Alarms & Events Dvst Installation Guide 13Audio Equipment required but not suppliedConnecting the DAL100 Cable Assemblies 14.1 X21 to V35 Cable Assembly 14.2 X21 Cable Assembly 14.3 V24 Sync Modem Cable Assembly 14.4 RS232 Cable Assembly DVST-PC 14.5 RS232 Cable Assembly DVST-DAL 15Glossary IsdnPage Returns Procedure Event of DifficultyPage Dvst Installation Guide Returns Procedure Returns Procedure Dvst Installation Guide

DVST, DFT 150/175 specifications

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In conclusion, Guardian Technologies' DFT 150 and DFT 175 models represent an excellent investment for anyone looking to improve indoor air quality. Their sophisticated filtration technology, additional UV-C features, energy efficiency, and user-friendly design make them a top choice for air purifiers in the market today.
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