New problems with modbusSeer

[jlikonen]

Hi, I'm now reading modbus registers from an ABB electricity meter B23. For example quantity active import is in reg 5000 (hex) and it is in 4 regs. Each register is 16 bits. I have first setup my TCP master and then added a new device. MB register 5000 (hex) corresponds to 20480. Basically I want to read 64bit data from this register. It didn't work. I then tried to create new devices, one for each register so I have 4 devices. None of them works. Debug log is:

 [TABLE="class: log_table_row"]
[TR]
[TD="class: LogDateLong LogDateTime1, align: left"][COLOR=#000000]helmi-05 12:51:55 [/COLOR][/TD]
 			[TD="class: LogPri1, align: left"] [/TD]
 			[TD="class: LogType1, colspan: 3, align: left"][COLOR=#000000]Debug [/COLOR][/TD]
 			[TD="class: LogEntry1, colspan: 8, align: left"][COLOR=#000000]Read adress: 5000 with name: Sähköauton lataus kWh value: -0.001 [/COLOR][/TD]
 		[/TR]
[/TABLE]
[TABLE="class: log_table_row"]
[TR]
[TD="class: LogDateLong LogDateTime0, align: left"][COLOR=#000000]helmi-05 12:51:55 [/COLOR][/TD]
 			[TD="class: LogPri0, align: left"] [/TD]
 			[TD="class: LogType0, colspan: 3, align: left"][COLOR=#000000]Debug [/COLOR][/TD]
 			[TD="class: LogEntry0, colspan: 8, align: left"][COLOR=#000000]Catched at readHoldingRegister: System.InvalidOperationException: Nullable object must have a value. at System.ThrowHelper.ThrowInvalidOperationException(ExceptionR esource resource) at HSPI_modbusSeer.serial.modbus.readHoldingRegister(ModbusClie nt client, addDevicesPageResponse slave) [/COLOR][/TD]
 		[/TR]
[/TABLE]
[TABLE="class: log_table_row"]
[TR]
[TD="class: LogDateLong LogDateTime1, align: left"][COLOR=#000000]helmi-05 12:51:55 [/COLOR][/TD]
 			[TD="class: LogPri1, align: left"] [/TD]
 			[TD="class: LogType1, colspan: 3, align: left"][COLOR=#000000]Debug [/COLOR][/TD]
 			[TD="class: LogEntry1, colspan: 8, align: left"][COLOR=#000000]Catched at readHoldingRegister: System.InvalidOperationException: Nullable object must have a value. at System.ThrowHelper.ThrowInvalidOperationException(ExceptionR esource resource) at HSPI_modbusSeer.serial.modbus.readHoldingRegister(ModbusClie nt client, addDevicesPageResponse slave) [/COLOR][/TD]
 		[/TR]
[/TABLE]
[TABLE="class: log_table_row"]
[TR]
[TD="class: LogDateLong LogDateTime0, align: left"][COLOR=#000000]helmi-05 12:51:55 [/COLOR][/TD]
 			[TD="class: LogPri0, align: left"] [/TD]
 			[TD="class: LogType0, colspan: 3, align: left"][COLOR=#000000]Debug [/COLOR][/TD]
 			[TD="class: LogEntry0, colspan: 8, align: left"][COLOR=#000000]Catched at readHoldingRegister: System.InvalidOperationException: Nullable object must have a value. at System.ThrowHelper.ThrowInvalidOperationException(ExceptionR esource resource) at HSPI_modbusSeer.serial.modbus.readHoldingRegister(ModbusClie nt client, addDevicesPageResponse slave) [/COLOR][/TD]
 		[/TR]
[/TABLE]
[TABLE="class: log_table_row"]
[TR]
[TD="class: LogDateLong LogDateTime1, align: left"][COLOR=#000000]helmi-05 12:51:55 [/COLOR][/TD]
 			[TD="class: LogPri1, align: left"] [/TD]
 			[TD="class: LogType1, colspan: 3, align: left"][COLOR=#000000]Debug [/COLOR][/TD]
 			[TD="class: LogEntry1, colspan: 8, align: left"][COLOR=#000000]Catched at readHoldingRegister: System.InvalidOperationException: Nullable object must have a value. at System.ThrowHelper.ThrowInvalidOperationException(ExceptionR esource resource) at HSPI_modbusSeer.serial.modbus.readHoldingRegister(ModbusClie nt client, addDevicesPageResponse slave) [/COLOR][/TD]
 		[/TR]
[/TABLE]
[TABLE="class: log_table_row"]
[TR]
[TD="class: LogDateLong LogDateTime0, align: left"][COLOR=#000000]helmi-05 12:51:56 [/COLOR][/TD]
 			[TD="class: LogPri0, align: left"] [/TD]
 			[TD="class: LogType0, colspan: 3, align: left"][COLOR=#000000]Debug [/COLOR][/TD]
 			[TD="class: LogEntry0, colspan: 8, align: left"][COLOR=#000000]Catched at readHoldingRegister: System.InvalidOperationException: Nullable object must have a value. at System.ThrowHelper.ThrowInvalidOperationException(ExceptionR esource resource) at HSPI_modbusSeer.serial.modbus.readHoldingRegister(ModbusClie nt client, addDevicesPageResponse slave) [/COLOR][/TD]
 		[/TR]
[/TABLE]

It looks like modbusSeer tries to read register 5000 so is the hex value for the register. When adding a new device I put 20480 for the holding register. Similarly for the next devices with registers 20481-20483. I'm sure my modbus is working because I also used Modbus Master software and I can read the registers without any problems. Any ideas?

[jlikonen]

I managed to solve this problem. I deleted the TCP master and the devices and recreated all of them. I hadn't given a value for the multiplier because I thought 1 is a default value. Now I gave this value and my devices are working. I don't know how to read a 64bit register so I created four devices, one for each Modbus register. This seems to work.

[salvesen]

hey, thanks for the info! I will make 1 default, it makes sense that this should have a default value.