KR920009118A - How to handle E bus protocol - Google Patents

Abstract

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Description

How to handle E bus protocol

As this is a public information case, the full text was not included.

1 is a structural diagram of an E bus to which the present invention is applied.

2 is a state transition diagram of a slave node viewed from a host.

3 (a) and 3 (b) are flowcharts of a method for processing an E bus protocol of a slave according to the present invention.

4 is a schematic polling flowchart of an E bus protocol processing method according to the present invention.

Figure 5 is an embodiment according to the E bus protocol processing method according to the present invention.

* Explanation of symbols for main parts of the drawings

11: E bus 12: E bus host

13: E bus slave a, b, c: transmission loop

Claims (8)

A clock line (a) for supplying control clocks to the master and slave stages, a first data line (b) consisting of an RS-485 loop for supplying data from the master stage to the slave stage, and the slave stage The second data line (c) consisting of an RS-485 loop for supplying data to the master terminal is provided with a protocol processing method of an E bus for exchanging D channel signals at one master terminal and a plurality of slave terminals. In; A first step of retrieving the status of the registration request signal REG-F of the slave end; a second step of performing and processing an abnormal group polling when the registration request signal REG-F is set; and the registration request signal And (REG-F) is reset by the third step of performing and processing normal group polling. The method of claim 1, wherein the second step includes: a first process of polling one abnormal node once, and searching for the presence or absence of a response to the polling, and transitioning to a normal group if a valid response within a predetermined time is reached; If it is not a valid response, a second process proceeding to the next step, and a third process of polling the next abnormal node and repeating the second process at most twice. 2. The method of claim 1, wherein the second step repeats the abnormal group polling until the registration request signal (REG-F) is cleared. The method of claim 1, wherein the second step repeats the abnormal group polling until there is no abnormal node. The method of claim 1, wherein the third step includes: a first process of polling one normal node, a second process of searching for the presence or absence of a response to the polling; A third process of repeating the first and second processes until the timeout count is 3, a fourth process of increasing the error count by 1 when the timeout count is 3, and an abnormality when the error count is 3 E bus protocol processing characterized in that performed by a fifth process of transition to a group. The method of claim 1, wherein the third step is repeated until the slave station responds with a control signal SM-POLL indicating that there is no packet to transmit. The method of claim 1, wherein the third step is repeated until the slave station responds with a control signal (SM-DATA, F = O) indicating that there are no more packets to transmit. . The E bus of claim 2, wherein the legitimate response is a control signal SM-POLL indicating that the slave terminal has no packet to transmit and a control signal SM-DATA transmitting the packet to the slave terminal. Protocol handling method. ※ Note: The disclosure is based on the initial application.