Symbol-technologies MicroBase MRC-921 Manuel d'utilisateur télécharger pdf (Page 32)

Glossary

asynchronous

transmission

A transmission with variable time intervals between

successive data characters. In asynchronous

communication, each data character is framed by

start and stop bits.

battery pack A sealed set of rechargeable nickel-cadmium batteries

used in the PTC-921 and recharged by the MRC-921.

bit The fundamental binary unit, either a 1 (on) or a 0

(off). In ASCII code, seven bits represent one

character of data.

bps Bits per second. A rate of electronic data transmission.

data

communication

The transport of encoded information from one device

to another.

host computer A personal computer or mainframe that receives and

processes data from remote PTCs.

LED Light-emitting diode. The indicator lights on the

MRC-921 are of this type.

nickel-cadmium

battery

A type of rechargeable battery used in PTC-921

battery packs.

one-way

communication

The transport of information from one device

to another without interruption. In one-way

communication, the receiving device cannot respond

directly to the sending device.

RF Radio frequency.

RS-232 An Electronic Industries Association (EIA) standard

that defines the connector, connector pins, and signals

used to transfer data serially from one device to

another.

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Symbol-technologies MicroBase MRC-921 Manuel d'utilisateur Page 32