Glossary - Honeywell SPM Technical Handbook

SPM Single Point Monitor
A.5 Glossary
This manual will be using the following terms when describing the SPM protocol to you.
BYTE: refers to a collection of 8 bits (or pieces) of information. A BYTE refers to this information as a single thing
or quantity.
COMMUNICATION: refers to the act or process of passing digital information between two points.
DATA: refers to the information that is transferred between the SPM and your equipment. DATA refers to the
information contained within a packet, whether it be concentration, date or some other piece of information.
EQUIPMENT: refers to the equipment that you plan to use to communicate with the SPM.
HANDSHAKE: refers to the process of acknowledging a communication has been received. The SPM uses
ACK/NAK responses.
INSTRUMENT: refers to the SPM instrument with which you intend to interface (or communicate).
PACKET: refers to the block of information that is passed between the instrument and your equipment. A PACKET
is made from many bytes of information.
PROTOCOL: refers to the manner in which the data is transferred and the format used to transfer the data. The
SPM PROTOCOL refers to the PACKET of BYTES the SPM recognizes.
TIME-OUT: refers to the maximum amount of time that SPM instrument allows for the equipment to respond to a
packet sent from the instrument. If the time period is exceeded, then the SPM will ignore any additional responses
to it. The SPM will not go into a fault condition or fault state.
The SPM will not deactivate the communication port, but rather will transmit more data when it is appropriate.
SPM Technical Handbook A-8