Parker LVD1 User Manual
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Parker Hannifin S.p.A. - Divisione S.B.C. LVD User’s Manual755 SERIAL INTERFACEThe drive communication protocol is "master-slave" half-duplex type on an asynchronousRS-485/RS-422 line. The drives assume control of the line only following interrogation bythe master.Up to 32 drives can be connected on the same serial line, allocating each a different serialaddress in parameter Pr27. Transmission speed can be programmed in parameter Pr26 asspecified in the table:(*) The version with code Pr26=4 differs from Pr26=5 because of the 25 ms response delay.This version was developed to interface with PLCs that require this characteristic.(**) The version with code Pr26=10 was developed to allow data communication betweentwo LVD drives.Refer to the heading Serial line connection for connection diagrams.5.1 Communications protocolThe right hand column in the table shows the time-out value in milliseconds for eachcommunication speed; this is the time, starting from the beginning of each message (STX)within which the transmission of the message must terminate. Therefore, if the message isinterrupted, after the time-out the drive will ignore the information already received and standby to receive a new message.Messages are made up of several consecutive data in the following format:1 start bit8 data bits following one byte between square brackets1 parity bit (even)1 stop bitThe message structure is:[STX] [CMD+ADDR] [LUN] [PAR] [D0]... [Dn] [CHK]where:Pr26 (decimal base) b/s time-out (ms)0 600 5121 1200 2562 2400 1283 4800 644 9600 (*) 325 9600 326 19200 167 38400 128 57600 89 125000 410 57600 (**) 8 |
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