Release notes for emModbus

Program corrections

1. MB_MASTER_WriteCoils() adds one payload byte too much if a multiple of 8 coils is used. The number of items/coils and their values in the message remain correct. The message might get refused by the slave if it checks the number of items/coils versus the number of payload bytes. Fixed.

New features

1. New Slave Modbus/TCP sample added that demonstrates handling multiple client connections.

Program corrections

1. TCP interface does not reset the channel buffer in an error case (unexpected disconnect) which might lead to the next messages(s) to cause confusion. Fixed.

New Features

1. New API added to allow using unicast slave address 0 with Modbus/TCP:
   • MB_SLAVE_ConfigIgnoreSlaveAddr()

Program corrections

1. De-initializing the stack does not call the interface pfDeInit() callback of the channel. Fixed.

Improvements

1. Updated shipped UART samples to fit with latest file changes across several middleware.

New Features

1. New configuration defines to change behavior in some situations:
   • MB_ALLOW_STREAM_HDR_UNDERFLOW
   • MB_DISCONNECT_ON_MSG_TOO_BIG

Program corrections

1. Slave does not send back Modbus error codes for a custom function code. Fixed.

Program corrections

1. Slave answers back on valid broadcast messages but should not. Fixed.

Improvements

1. Added further message checks to the slave to detect faulty messages sent by a master.

Program corrections

1. Using Modbus/TCP the message size reported to the custom callback includes the size of the Modbus/TCP header. Fixed.
2. The slave channel buffer is not reset on messages that do not send back an answer like a broadcast. Fixed.

New Features

1. New API added for implementation of custom function codes added:
   • MB_SLAVE_SetCustomFunctionCodeHandler()
   • MB_LoadU16BE()
   • MB_StoreU16BE()

New Features

1. Added RTU & ASCII interfaces to PC ports.

Program corrections

1. Using different task priorities than provided with samples or using round robin might confuse the message processing. Fixed.
2. Using non-native data processing types like stream read/write instead of interrupt driven byte transfer for RTU might confuse the message processing. Fixed.

New Features

1. Non-OS layer added.

Improvements

1. Changed Windows samples to use fgets() instead of _cgets() as Keyboard inputs do not work reliable with _cgets() on newer compilers.

Program corrections

1. The wrong timer frequency is used for calculation if MB_ConfigTimerFreq() has not been called. Fixed to default of 1kHz.
2. RTU interface might corrupt data on CPUs if data in structures is not padded to a multiple of 4 bytes. Fixed.

Initial version