11.27 User defined protocol

If the device does not support MODBUS standard, and the protocol is not list in PIStudio, then user can define the protocol by following instruction to realize simply communication functions like sending and receiving commands.

HMI settings

Items	Settings	Note
Protocol	User defined protocol
Connection	RS485/RS232
Baud rate	2400~187500
Stop bits	1/ 2
Data bits	7/ 8
Parity	None/ Even/ ODD

Operating procedures

1) Select [User defined protocol];

2) Click [User defined protocol] button to open setting window as below;

3) Configure user defined command;

No	Item	Description
1	Instruction edit	The required command.
2	Mode	Write to address or read from the address.
3	Format	Encode format: HEX or ASCII.
4	Other	No receiving: HMI does not respond to the receiving command. Send after receiving: HMI responds to the receiving command.
5	Manually send	Respond once after trigger the address. Address: set the trigger address.
6	Add	Save this setting.
7	Cancel	Cancel current settings.
8	Add	Add a new command.
8	Edit	Edit the selected command.
8	Delete	Delete the selected command.
8	Clear	Clear all the commands.
9	Instruction list	Display all current commands.
10	Address list	Display all the addresses added.
11	Import	Import the command files to the instruction list.
11	Export	Export current command settings to local storage.
11	Browse	Browse local command files.
11	Advanced	Combine two commands.
11	Exit	Complete editing and exit setting.

Operating procedures

1) Click [Add] to create a new command, as below shows;

2) Select mode, [Read] or [Write], and then select Format, there are two options [Hex] and [ASCII]. As below shows;

3) Other settings: [No receiving] means HMI only sends command, and it would not process the reply command which from device. [Send after receiving] means HMI will be receiving the command which from device firstly, and then sending the command to device. From example, when HMI receiving [00 FF 00] firstly and then send command, as below shows

4) Check [Manually send], and then please set the address for trigging, the setting range is 1~10, and please put Bit switch in project screen for it, and [OneCtrlBit] register is for [Manually send].

5) Instruction edit, when the data format is HEX, please use two numbers to represent one 16-bit number. ASCII format using characters to input;

6) Check settings;

No	Items	Description
1	Add checking	Add checking command when receiving the data.
2	Back checking	Add control character in ASCII format.
2	Differ with send check	Set return checking.
3	Add control character	Start position: select the start position of the data which need to check. Length: The data length need to be checked.

7) Object settings;

No	Items	Description
1	Object settings	Object type: bit or word address; Address: the triggering address; Note: description to object;
2	Byte order	The numerical display order;

8) Data length settings;

No	Item	Description
1	Return data	Position: the start position of the return data. Length: the return data length.
2	Write data	Position: the start position of the write data. Length: the write data length.

9) Instruction length settings

No	Item	Description
1	Send length	The instruction data will only send designated data length.
2	Return length	The responds data length.
3	End code	Instruction will not be terminated until receiving [End code];

Cable wiring

1) RS485

2) RS232

✎Note:

COM3 is available in PI8000 series and advanced series.