MODBUS RTU 传输文件 |
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File Transport Over MODBUS (FOM)
1. Use function code 0x17
2. Use relative address
3. Register description
Command Register (0x0000) #define SOH 0x01 #define STX 0x02 #define EOT 0x04 #define CA 0x18 #define C 0x43 #define NAK 0x15Sequence Register (0x0001) Data Register (0x0002~0x0401) 4. Sequence diagram4.1 Write File Write Command+Sequence+Data Register, Read Command Register by MODBUS 0x17 code Master Slave Begin Write [0x17]SOH+Seq(0)::FileName+FileSize...192 Bytes C+Seq(0) Writing:normal [0x17]STX+Seq(>0)::raw bytes C+Seq(>0) Repeat until complete Writing:error [0x17]STX+Seq(>0)::raw bytes NACK+Seq(>0) Writing:abort [0x17]STX+Seq(>0)::raw bytes CA End Write [0x17]EOT+Seq(>0)::raw bytes(all zeros) CA Master Slave4.2 Read File Write Command+Sequence Register, Read Command+Sequence+Data Register by MODBUS 0x17 code Master Slave Begin read [0x17]C+Seq(0)+FileName... SOH+Seq(0)::FileName+FileSize...192 Bytes Reading:normal [0x17]C+prevSeq(>0) STX+Seq(>0)::192 raw bytes Repeat until complete Reading:error [0x17]NAK+prevSeq(>0) STX+prevSeq(>0)::192 raw bytes Reading:abort [0x17]CA EOT+Seq(>0)::192 raw bytes(all zeros) End read [0x17]C+prevSeq(>0) EOT+Seq(>0)::raw bytes(all zeros) Master Slave |
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