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Please help us to share our service with your friends. Share Embed Donate. Copyright ASTM Standard Specification for Low-Level Protocol to Transfer Messages Between Clinical Laboratory Instruments and Computer Systems1 This standard is issued under the fixed designation E ; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision.
A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. Scope 1. The clinical laboratory instruments under consideration are those that measure one or more parameters from one or more patient samples. Often they will be automated instruments that measure many parameters from many patient samples. The computer systems considered here are those that are configured to accept instrument results for further processing, storage, reporting, or manipulation.
This instrument output may include patient results, quality control results, and other related information. The electrical and mechanical connection between instrument and computer is described in the Physical Layer section.
The methods for establishing communication, error detection, error recovery, and sending and receiving of messages are described in the Data Link Layer section.
Referenced Documents 2. Terminology 3. Current edition approved Oct. Published January Originally published as E — Last previous edition E — The order of the bits in a character is: 1 One start bit, corresponding to a binary 0, 2 The data bits of the character, least significant bit transmitted first, 3 Parity bit, 4 Stop bit s , corresponding to a binary 1.
The data interchange circuit is in the marking condition between characters. Odd parity corresponds to an odd number of ONE bits when formed in the same way.
Eight data bit character sets are allowed but not specified by this standard. Other character structures can be used for specialized applications, for example, seven data bits, odd, even, mark or space parity, or two stop bits.
The preferred rate is baud and should be the default setting of the instrument when more than one baud rate is available. The computer system must have the capability for all four baud rates. See Fig. Within the domain of either device, any appropriate connection system may be used, preferably with suitable cable locking hardware. The connector contact assignments are listed in Table 1.
Connector contacts not listed are unused. The connector contact assignments conform to the EIAD standard for the circuits that are used. The parts are hierarchical and are listed in order of most encompassing first. When used with Specification E , this term means a record as defined by Specification E Significance and Use 4. To accomplish this connection, both the instrument and the computer must have compatible circuits and appropriate software, and there must be a proper cable to connect the two systems.
This increases the cost, the chances for compatibility problems, and the difficulty of specifying and designing a proper system. In addition, interfaces for every instrument-computer combination may not be available, forcing expensive and time-consuming custom development projects. It is expected that future products from instrument manufacturers and computer system developers, released after the publication of this specification, will conform to this specification, and that will lead to plug-together compatibility of clinical instruments and computer systems.
Physical Layer 5. The topology is point-to-point, a direct connection between two devices. A 2 E FIG. Detailed requirements of an interconnecting cable are undefined but good engineering practice should be followed in selecting the cable and connectors. Shielded cable and connectors may be necessary to suppress electromagnetic interface EMI. Low capacitance cable may be necessary for long cable lengths or the higher data rates.
Appropriate connector locking hardware should be used at the conforming connectors. Direction Contact No. EIA Circuit 1 2 3 Output Input No Connection Input Output The shield connection is left open at the computer the DCE to avoid ground loops. There will be no connections on any other pins. All other pins will be open circuits. The conforming connector associated with the computer is a commercial type DBS subminiature D female style connector.
The connector dimensions must correspond to those given in the EIAD standard. When the conforming connector of the computer is cable mounted, it shall be configured with a locking device such as No.
The mating cable connector shall use devices such as No. Data Link Layer 6. Delimiting and synchronism provide for framing of the data and recognition of frames.
Sequence control maintains the sequential order of information across the connection. Error detection senses transmission or format errors. Error recovery attempts to recover from detected errors by retransmitting defective frames or returning the link to a neutral state from otherwise unrecoverable errors. Some restrictions are placed on the characters which can appear in the message content.
Information flows in one direction at a time. Replies occur after information is sent, never at the same time. It is a simplex stop-and-wait protocol. The remainder of the time the data link is in a neutral state. See the state diagram in Annex A1. In each phase, one system directs the operation and is responsible for continuity of the communication. The three phases assure the actions of sender and receiver are coordinated. The three phases are establishment, transfer, and termination.
The receiver responds that it is prepared to receive before information is transmitted. It acts as a receiver, waiting for the other system. After the sender determines the data link is in a neutral state, it transmits the transmission control character to the intended receiver.
Sender will ignore all responses other than , , or. All other characters are ignored. It replies with the transmission control character signifying it is ready.
With this sequence of events, the establishment phase ends and the transfer phase begins. Upon receiving , the sender must wait at least 10 s before transmitting another. Systems not having the ability to send information never transmit an. The instrument system has priority to transmit information when contention occurs.
Contention is resolved as follows: 1 Upon receiving a reply of to its transmitted , the computer system must stop trying to transmit; it must prepare to receive. When the next is received, it replies with an or depending on its readiness to receive. The transfer phase continues until all messages are sent.
Messages longer than characters are divided between two or more frames. Every message must begin in a new frame. Intermediate frames terminate with the characters , checksum, and. End frames terminate with the characters , checksum, and. A message containing characters or less is sent in a single end frame.
Longer messages are sent in intermediate frames with the last part of the message sent in an end frame. It is a single digit sent immediately after the character. The frame number begins at 1 with the first frame of the Transfer phase. The frame number is incremented by one for every new frame transmitted. After 7, the frame number rolls over to 0, and continues in this fashion.
The checksum is encoded as two characters which are sent after the or character. The checksum is computed by adding the binary values of the characters, keeping the least significant eight bits of the result. The first character used in computing the checksum is the frame number. Each character in the message text is added to the checksum modulo
Other Historical Standards. More E The clinical laboratory instruments under consideration are those that measure one or more parameters from one or more patient samples. Often they will be automated instruments that measure many parameters from many patient samples. The computer systems considered here are those that are configured to accept instrument results for further processing, storage, reporting, or manipulation. This instrument output may include patient results, quality control results, and other related information.
For Windows - Windows 10 incl. Server, x86 and x Latest version: 4. May 20, Print version. We need to collect data from laboratory equipment that supports the ASTM data interchange protocol and write them to a database.
ASTM protocol: reading data from laboratory equipment
Thank you for interesting in our services. We are a non-profit group that run this website to share documents. We need your help to maintenance this website. Please help us to share our service with your friends. Share Embed Donate. Copyright ASTM Standard Specification for Low-Level Protocol to Transfer Messages Between Clinical Laboratory Instruments and Computer Systems1 This standard is issued under the fixed designation E ; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision.