M Bus Error
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on time slices for each of the maximum 64 alarm devices. This alarm protocol has not been standardized. We now suggest to return to standard alarm protocol which conforms to the standard IEC 870-2: The master software polls the maximum 250 alarm devices by requesting time
Bus Error Ubuntu
critical data (REQ_UD1 to adresses 1 .. 250). A slave can transmit either a single character bus error vs segmentation fault acknowledgement E5h signalling no alarm or a RSP_UD with the CI-Field 71h to report an alarm state. 68h 04h 04h 68h 08h Adr 71h
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Alarm State CS 16h Fig. 34 Telegram for an Alarm-Respond
The alarm state is coded with data type D (boolean, in this case 8 bit). Set bits signal alarm bits or alarm codes. The meaning of these bits is http://www.engiby.ch/mbus/mbustrbs.htm manufacturer specific. The timeout for time critical communication must be set to 11..33 bit periods to ensure a fast poll of all alarm devices. With a baudrate of 9600 Bd and all 250 slaves reporting an alarm just in time before a timeout occurs each slave will be polled in periods of maximum 5.5 seconds. This seems to be fast enough for alarms in building control systems and other applications. For faster alarm systems the number of alarm sensors could be http://www.m-bus.com/mbusdoc/md8.php limited to 63 (reducing the worst case overall signal delay to less than 1.5 sec or increase the transmission speed to 38400 Bd (with the new repeater hardware) and achieve the same speed for up to 250 devices. The functionality of the FCB- and FCV-Bit should be fully implemented in this alarm protocol to ensure that one-time alarms are safely transmitted to the master. If the slave has reported an one-time alarm and the next REQ_UD1 has a toggled FCB (with FCV=1) the slave will answer with an E5h signalling no alarm. Otherwise it will repeat the last alarm frame to avoid that the alarm message gets lost. This new alarm protocol has the advantages of being standardized in IEC 870-2, simple implementation in slaves and master, fast poll cycles and using almost (with the exception of shorter timeout) the normal protocol. In addition it is allowed under EN1434-3 which allows all other types of communication of IEC-870-5-2. 8.2 Coding of Data Records The standard IEC 870-5-4 defines the following data types for usage inside the application layer: Type A = Unsigned Integer BCD := XUI4 [1 to 4] <0 to 9 BCD> 27 26 25 24 23 22 21 20 digit 10 digit 1 1UI4 [1 to 4] <0 to 9 BCD> := digit 100 8 4 2 1 8 4 2 1 2UI4 [5 to 8] <0 to 9 BCD> := digit 101 ... ... ...Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this http://serverfault.com/questions/456337/server-responds-bus-error-to-every-command site About Us Learn more about Stack Overflow the company Business Learn http://stackoverflow.com/questions/36952589/bus-error-while-compiling-with-gcc more about hiring developers or posting ads with us Server Fault Questions Tags Users Badges Unanswered Ask Question _ Server Fault is a question and answer site for system and network administrators. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can bus error answer The best answers are voted up and rise to the top Server responds “bus error” to every command up vote 4 down vote favorite I have a linux machine dedicated to MySQL server with a pretty high load. Today I woke up and was terrified to see that database server is down. I could connect to it via SSH, but it was responding with bus error linux bus error to each and every command: [root@r1304 home]# ls Bus error [root@r1304 home]# tail /var/log/messages Bus error [root@r1304 home]# reboot Bus error [root@r1304 home]# free -m Bus error [root@r1304 home]# chkdisk Bus error I went to Data Center and did a hard reset, which seemed to help, but after a half an hour situation reapeated and now I can't even connet via SSH anymore. Any ideas what this could be? how to diagnose such a problem and what are possible fixes? Server has 32 GB RAM, 2xSSD drives with software RAID UPDATE According to Zabbix, when MySQL died, number of processes stated to increase drammaticaly, until I did a hard reset. What could those be? Number of processes linux centos hardware ssd bus share|improve this question edited Jul 24 '14 at 20:09 msanford 1,2251224 asked Dec 8 '12 at 13:30 Temnovit 31241224 Those are processes piling up waiting for I/O. Something is happening at the storage layer. –ewwhite Dec 8 '12 at 23:47 What was the issue? –ewwhite Dec 10 '12 at 10:32 @ewwhite, well, the hard drive completely died. Hello, kingston SSD. I'm b
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Bus error while compiling with gcc up vote 3 down vote favorite 1 I can't seem to be able to compile even simple C programs anymore; I can't seem to be able to pinpoint what changed from yesterday, when all seemed to be fine. I'm using gcc 5.2.1. Compiling this program (or any other program) #include