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MS-Connect 210 User’s Manual A-11

Appendices

Opto-isolation

—The transfer of signals between elements of a circuit (typically a transmitter

and receiver) while keeping the elements electrically isolated. An example of opto-isolation

is the relationship of an LED and a light sensor, separated from each other so that light

can travel across a barrier but electrical current cannot.

Output

—A channel or communications line. The data or discrete signals that are transmitted

or displayed by a device.

Parity—An error detection routine in which one data bit in each character is set to 1 or 0

so that the total number of 1s in the data field is even or odd.

Port—Logic circuit for receiving and transmitting data. (One or more ports may be

included within a single connector.)

Protocol—The rules for communication between devices, providing a means to control

the orderly flow of information between linked devices.

Read Cycle—A pre-defined period of time during which a reader will attempt to capture

symbol data.

RoHS (Reduction of Hazardous Substances)—A directive that restricts the use of lead,

mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBB), and polybrominated

diphenyl ether (PBDE) in the manufacture of certain types of electronic and electrical

equipment.

Signal—A transmission of analog or digital information, electrical current, voltage, or

another specific quantity, that can be varied in such a way that it conveys information from

one point to another.

Symbology—A symbol type, such as Code 39 or Code 128, with special rules to define

the widths and positions of bars (or 2D modules) and spaces to represent specific numeric

or alphanumeric information.

Terminal Block—An insulated block on a printed circuit board (PCB) that secures two or

more wires together using a clamping device (usually screws or spring clips).

Topology—The arrangement of a network, including communication nodes and connection

lines.

Trigger—A signal, transition, or character string that initiates a read cycle.

UART (Universal Asynchronous Receiver/Transmitter)—A hardware device that converts

bytes of data to and from bit streams represented as binary electrical impulses. Typically

used with other communication standards, such as RS-232.

VFD (Vacuum Fluourescent Display)—A very bright type of display (brighter than a liquid

crystal display) often used on consumer electronics. The MS-Connect 210’s display is a

VFD.

Watchdog—A hardware timing device that restores the normal operation of a computer

system (the display driver, in the case of the MS-Connect 210) if it stops functioning properly.

WEEE

(Waste Electrical and Electronic Equipment)—A directive that requires manufacturers

of electrical and electronic equipment to take responsibility for the disposal of that equipment.

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