Myalarm V-LCD1 Bedienerhandbuch PDF herunterladen (Seite 290)

GLOSSARY

D-284

System 2 Installation / Programming Manual

Proximity

A type of card technology that sends wireless digital data from a card to a reader through means

of an electrostatic coupling.

RAM

Random Access Memory. Semiconductor memory that can be both written to and read from.

Specified by size (128K x 8).

RS-232

Data transmission standard using +/- 12 volt transitions to transmit digital data.

RS-485

Data transmission standard using differential voltage levels to send and receive data on a

shielded, twisted pair of wire in a multi-drop configuration up to four thousand feet long. Highly

immune to electrical noise.

RTE

Request to Exit. A circuit controlled by a push button installed within a secured area which,

when pressed, allows a user to exit the area. RTE’s should always be redundant, that is, a

second method should be used to allow an exit.

RTS

Request to Send. An RS-232 output from the System 2. It tells a device attached to it that its

OK to send data. Generally connected to the CTS of the sending device.

RXD

Receive Data. An RS-232 input that receives data from a transmitting device. This Input must

be connected to the TXD output of the transmitting device.

Seed Number

A number used to generate an exact duplicate list of users when batch programming keypad

codes.

Short Haul Modem

A type of modem that does not require a dial up phone line. Four wires are required between a

pair of modems to send and receive digital data over distances of a few miles.

Slave

A System 2 unit that is programmed to be part of a network of System 2's and under control of a

master System 2.

SPDT

Single Pole Double Throw. Also a “C” form switch contact having a Normally Open (NO),

Common and Normally Closed (NC) arrangement

SPST

Single Pole Single Throw. A switch or relay contact having Common and Normally Open (NO)

or Normally Closed (NC)

arrangement. Can also be referred to as a form “A” (NO) or form “B” (NC) contact.

Time Cancel

A feature that cancels any remaining door open time as soon as the door is closed.

TXD

Transmit Data. An RS-232 output that sends data to a receiving device. This output must be

connected to the RXD input of the receiving device.

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