0x34(RequestDownload)请求下载
0x34(RequestDownload)服务通常和0x36(TransferData)、0x37(RequestTransferExit)服务一起使用。
举例如下：
tester 发送：
0x34 0x00 0x44 0x80 01 C0 00 0x00 01 C0 00
Data FormatIdentifer00: Neither compress Method nor encrypting Method is used
AddressAndLengthFormatIdentifer44: memory size is 4, memory address is 4.
Memory Address 80 01 C0 00: the start address of Memory where data is to be written to.
Memory Size 00 01 C0 00: the total amount of data transferred during the 0x36 Services is 0x01 C0 00, 112KB
举例如下：
tester 发送：
0x34 0x00 0x44 0x80 01 C0 00 0x00 01 C0 00
ECU响应：
0x74 0x20 0x0FFF (Positive response starting with 0x34+ 0x40 = 0x74, the length ofmaxNumberOfBlockLengthis 0x2 Byte,maxNumberOfBlockLengthis 0FFF, 3KB,the amount of data block transferred by each 0x36 Service.）
0x36(TransferData)数据传输
需要注意的是，第一个0x34请求对应的0x36服务的BlockSequenceCounter参数值从 0x01开始，后续每个0x36服务该参数依次+1. 当累计值达到0xFF后，该参数从0x00开始下一轮传输。
举例如下：
tester发送：
0x36 0x00 (TransferDatarequest 0x36,blockSequenceCounteris 0x00)
ECU响应：
0x76 0x00 (Positive response starting with 0x36+ 0x40 = 0x76)
0x37(RequestTransferExit)退出数据传输
举例如下：
tester发送：
0x37 (RequestTransferExit)
ECU响应：
0x77 (Positive response starting with 0x37+ 0x40 = 0x77)
