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     ASTM communication protocol   QUANTA Link™      ASTM communication protocol Page 2 of 15 Index 1.   INTRODUCTION ..................................................................................................................... 3   2.   REFERENCES .......................................................................................................................... 3   3.   LOW LEVEL PROTOCOL .......................................................................................................... 3   4.   PHYSICAL LAYER ................................................................................................................... 3   4.1.   D  ATA L INK L  AYER  ......................................................................................................................... 3   4.1.1.   Establishment Phase ......................................................................................................... 4    4.1.2.   Transfer Phase ................................................................................................................. 5    4.1.3.   Termination Phase ............................................................................................................ 5    4.1.4.   Error Recovery .................................................................................................................. 5    4.1.5.   Restrictions ...................................................................................................................... 6    5.   HIGH LEVEL PROTOCOL ........................................................................................................ 6   5.1.   M ESSAGE SPECIAL CHARACTERS  ........................................................................................................ 7   5.2.   D  ATA RECORD USAGE  ..................................................................................................................... 7   5.2.1.   Message Header Record .................................................................................................... 7    5.2.2.   Patient Identifying Record.................................................................................................. 8    5.2.3.   Test Order Record ........................................................................................................... 10    5.2.4.   Result Record ................................................................................................................. 11    5.2.5.   Comment Record ............................................................................................................ 12    5.2.6.   Scientific Record ............................................................................................................. 13    5.2.7.   Manufacturer Information Record ..................................................................................... 13    5.2.8.   Message Terminator Record ............................................................................................. 13     ANEX I.   MESSAGES EXAMPLES .............................................................................................. 14      ASTM communication protocol Page 3 of 15 1.   Introduction This document describes the standard Instrument Interface for Quanta Link. The interface is based in ASTM standards E 1381 91 and E 1394 91. Covers low level protocol (physical and data link layer) and high level protocol. The following lines are all the available messages between Quanta Link and the instrument:    New Requests from HOST to Quanta Link. (T requests)    Results from Quanta Link to HOST. 2.   References    Low level Protocol: As specified in ASTM standard E 1381 91    High level Protocol: As specified in ASTM standard E 1394 91 3.   Low level protocol This section provides information on the low-level implementation of the ASTM low-level protocol in Quanta Link communication. 4.   Physical Layer Quanta Link allows asynchronous Network connections via TCP/IP Sockets, acting as a server. The communication is permanent and not only established when there are messages to send. Quanta Link will be listening in a specific IP address and Port. The IP address and Port will be defined during the phase of implantation of the system in the specific customer. It is possible to test the system via Internet. 4.1.   Data Link Layer The data link layer uses a character-oriented protocol to send message between directly connected systems. The data link mode of operation is one-way transfer of information with alternate supervision. Information flows in one direction at a time. It is a simplex stop-and-wait protocol. It specifies procedures for link connection and release (establish which system sends and which receives), delimiting and synchronism (framing of data and recognition of frames), sequence control (sequential order of information across the connection), error detection and error recovery (by retransmitting defective frames or returning the link to a neutral state). There are three phases to assure the actions of sender and receiver are coordinated. The three phases are establishment, transfer and termination.    ASTM communication protocol Page 4 of 15 4.1.1.   Establishment Phase  After the sender determines the data link is in neutral state, it transmits the <ENQ> transmission control character to the intended receiver. Upon receiving the <ENQ>, the receiver prepares to receive information. All other characters are ignored. It replies with the <ACK> transmission control character signifying it is ready. At this point the establishment phase ends and the transfer phase begins.  A receiver that cannot immediately receive information replies with the <NAK> transmission control character. Upon receiving <NAK>, the sender must wait at least 10 seconds before transmitting another <ENQ>. In case of contention (both systems simultaneously transmit an <ENQ>) Quanta Link has priority to transmit information.
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