Application Note
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1. 2400 0x0960 sent Note that transmitted value is 60 x speeds in Hz ie 60x 40 0 2400 Ox7F Stop Flag 0x35 0x45 Ox7F Checksum Stop Ox5E Flag2. The user manual of B800 Series Rs 485 communication Bedford Quanzhou Electronic Co LTd The RS 485 user manual for B800 series communication RS 232 communication inbuilt inside the main board of B800 series frequency inverter we can effect RS 485 communication through fitting communication board externally When we want to use RS 485 communication board it is necessary for you to connect externally the insulated 9VDC 12VDC There are indications on the polarity plug Please reference it When you put the polarity plug on the opposition RS 485 is not able to work but the RS 485 communication card can not be damaged There are four connection wire place indicate 1 2 3 4 separately which they stand for B phase A phase B phase A phase The action of 1 amp 3 2 amp 4 is same as well The user manual of B800 Series Rs 485 communication Bedford Quanzhou Electronic Co LTd Bs00 communications protocol The communications protocol ASCII based operating at 9600 bps Each transmitted byte consists of a Start bit 1 8 Data bits LSB first and a Stop bit 0 Each B800 acts as a slave unit any will only transmit data in response to a request from the Host master Up to 63 drive addresses are permitted Global telegrams are permitted allowing simultaneous data transfer to multiple drives When data is received by an B800 it will be actioned im
3. al NOT of the byte result of the byte addition of all transmitted ASCII bytes excluding the START and STOP flags and the checksum itself i e DA CMD DATA FG2 Stop flag 0x7F flags end of data transmission For communication with the B800 from a Host controller add the value 128 to the drive address Examples 7 Send Run Command to Drive number 01 from intelligent host F 12 1 or 2 The required data transmission will be Ox7E 0x38 0x31 0x35 0x32 0x32 0x46 0x7F Start Drive number Command Checksum Stop Flag 128 01 0x2F Flag 2 Send new target speed of 40 0Hz from intelligent host to drive 05 in keypad mode The required data transmission will be 0x7E 0x38 0x35 0x35 0x30 0x30 0x39 0x36 0x30 0x35 0x45 0x7F Start Drive number Command Target Speed 40 0Hz Checksum Stop Flag 128 05 P 2400 0x0960 sent Ox5E Flag The user manual of B800 Series Rs 485 communication Bedford Quanzhou Electronic Co LTd Note that the transmitted speed in Hertz is always 60x the speed required Therefore 40Hz is transmitted as 40 0 x 60 2400 The high byte is transmitted first A word 16 bit value is always transmitted Checksum logical NOT gt 0x38 0x35 0x35 0x30 0x30 0x39 0x36 0x30 0x5E Note that the checksum is the least significant byte of the result Global commands to multiple B800s Some applications require particular commands to be sent simultaneously to multi
4. mediately All transmitted bytes other than the START and STOP flags including all commands and the data checksum are sent as ASCII codes For example a RUN command R 0x52 hex is sent as two consecutive ASCII codes ie 0x35 0x32 Further examples will be shown in the following section Any non ASCII byte received other than the START STOP flags will terminate the data reception and a new sequence must be started Communications protocol details Master Host controller transmit data packet format All transmissions originating from a Host controller must have the following format FG1 DA CMD DATA CS FG2 Where FG1 Start Flag 0x7E flags start of data transmission DA Drive Address valid addresses 1 63 CMD Master Command R 0x52 Run command SS 0x53 Stop command see note below A 0x41 Motor current request see note below Z OX5A Speed request in Hz see note below M 0x4D Speed request in RPM T 0x54 Drive Status request V 0x56 Software version request The user manual of B800 Series Rs 485 communication Bedford Quanzhou Electronic Co LTd Keypad mode only F 12 1 P 0x50 Set new speed in Hz Keypad mode only F 12 1 k 0x49 Increase speed on ramp Keypad mode only F 12 1 L 0x4C Reduce speed on ramp DATA transmitted data data will depend on command send CS data checksum calculated at the time of transmission and is the logic
5. otor current z Ox7A Speed request in Hz m 0x6D Speed request in RPM t 0x74 Drive Status returned v 0x76 Software version returned p 0x70 New speed in Hz loaded Keypad mode only F 12 1 o 0x69 Increase speed actioned T 0x60 Reduce speed actioned e 0x65 Error command not executed error code gives reason why DATA requested data data will depend on the command received CS data checksum calculated at the time of transmission and is the logical NOT of the byte result of the byte addition of all transmitted ASCII bytes excluding the START and STOP flags and the checksum itself i e DA REPLY DATA FG2 Stop flag Ox7F flags end of data transmission Examples 7 Run Command to Drive number 01 carried out F 12 1 or 2 The resulting reply data transmission will be Ox7E 0x30 0x31 0x37 0x32 0x33 0x35 Ox7F Start Drive number Reply r Checksum Stop Flag Flag The user manual of B800 Series Rs 485 communication Bedford Quanzhou Electronic Co LTd 2 New target speed of 40 0Hz set in drive 05 The resulting reply data transmission will be Ox7E 0x30 0x35 0x37 0x30 0x33 0x33 0x7F Start Drive number Reply p Checksum Stop Flag Flag In the event of an error occurring the message will have the following format Start Flag Drive Addr f fe errorcode checksum stop flag The error code will have one of the following val
6. ple B800s An example of this would be a RUN command or a STOP command Global commands are sent by using the ASCII code for G 0x47 as the drive address All B800s receiving a command following this drive address will carry out this command There is no reply from the B800s to a global command Example 1 Send a Run Command to all B800s from intelligent host F 12 1 or 2 The required data transmission will be Ox7E 0x34 0x37 0x35 0x32 0x32 0x44 Ox7F Start Global drive Command Checksum Stop Flag Address G R 0x2D Flag 0x47 Slave B800 reply data packet format Whenever a valid data packet is received by the B800 the response will have a format defined by the following information Note that if a valid data packet is received with an incorrect different drive address the B800 will ignore the data and no response at all will be generated All responses to valid commands will be the lower case equivalent to the command received For example if a R command is received by the B800 it will respond with an r reply Format of the B800 response FG1 DA REPLY DATA CS FG2 The user manual of B800 Series Rs 485 communication Bedford Quanzhou Electronic Co LTd Where FG1 Start Flag 0x7E flags start of data transmission DA Drive Address returns its own Drive address REPLY Slave reply o 0x72 Run command executed s 0x73 Stop command executed a 0x61 M
7. ues 0x02 Drive in Standby status information 0x91 B800 not in keypad mode 0x92 B800 speed in RPM not available F 10 0 0x93 B800 running command cannot be carried out 0x94 B800 stopped command cannot be carried out 0x95 Invalid data incorrect checksum 0x97 Invalid command command not recognized 0x98 B800 parameters locked command cannot be carried out 0x99 B800 hardware enable not present Ox9A B800 tripped Further examples 1 Start all drives Ox7E 0x34 0x37 0x35 0x32 0x32 0x44 Ox7F Start Global drive Command Checksum Stop Flag Address G R Ox2D Flag 0x47 Global drive address commands are received by all slaves The user manual of B800 Series Rs 485 communication Bedford Quanzhou Electronic Co LTd 2 Reverse direction of all drives F 12 2 Ox7E 0x34 0x37 0x35 0x82 0x32 0x44 Start Global drive Command Checksum Flag Address G R 0x2D 0x47 Ox7F Stop Flag Sending a run command to an already running drive reverses direction if F 12 2 3 Stop all drives Ox7E 0x34 0x37 0x35 0x33 0x32 0x43 Start Global drive Command Checksum Flag Address G S Ox2C 0x47 All drives action the command if drive address is global G 4 Send new speed of 40 0Hz to drive number 5 Ox7E 0x38 0x35 0x35 0x30 0x30 0x39 0x36 0x30 Start Drive number Command Target Speed 40 0Hz Flag 128 05 P
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