Symbol Technologies MicroBase MRC-921 - Manual (Page 33)

signals Electronic impulses that transmit data from one
device to another.
two-way
communication Exchange of information between two devices. After
each block of data, the receiving device sends a
positive or negative acknowledgment to the sending
device.
VDC Volts direct current. A unit of measure of electric
potential or potential difference in a unidirectional
electrical current.
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