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Messages - StefanA

Pages: [1] 2
1
Technical support / RemoteFS
« on: July 05, 2014, 01:53:55 AM »
I use the RemoteFS and Print commands to send a log file to a PC running Trilog server software. The file ends up in the Fileservice folder. Is it possible to send the file to another folder? I would like to store the log file in the Trilog public folder so I can access it from a web browser.

2
Technical support / Re:Modbus wiring
« on: April 02, 2014, 08:54:38 AM »
The slave is powered by 230V AC. But if I tie the slave's RS485 COM terminal to the Nano 0V power supply the signal ground should be same?

The distance between the Nano and the slave are about 50 feet so it's maybe a good idea to include the terminating resistor. I've seen some wiring examples with terminating resistors in both end of the network. Is that of any importance?

3
Technical support / Modbus wiring
« on: April 01, 2014, 10:02:25 AM »
Been working on a little projekt with a Nano-10 acting as a RS485 modbus master and a temperature controller as a slave device. When programming and testing on my desk I have only used two wires for communication but what is the right way to wire it up in the field? I attached a picture describing how I think the wiring should be, but I'm not completely sure. I'm planning to replace the RS485 driver to a LT1785AIN8.

4
Technical support / Re:Hour meter
« on: February 23, 2014, 02:17:54 AM »
Thanks for the explanation Gary. My application is not that time critical. I could just not understand why my meter was lagging.

5
Technical support / Hour meter
« on: February 19, 2014, 11:43:13 PM »
I made a hour meter by letting a special bit second clock increment a variable which increments other variables so that get minutes and hours. When running the function against a referens clock (the pc clock) I have noticed a lagging effect after an hour or so. When running for 10 hour the difference is 30 seconds or more. Have I design the function wrong or is the special bit second clock not that accurate.

6
Technical support / Re:Displaying time
« on: February 05, 2014, 09:58:52 AM »
I use modbus/tcp. But I have a lot of objects on the hmi screen and apparently it takes to long to update them. I made a test screen with only the time registers and that work fine. Have to think something out. Another question. Can I use the 5v analog reference voltage to power a analog temp. sensor? The current runs well below 50µA.

7
Technical support / Displaying time
« on: January 31, 2014, 06:40:11 AM »
I want to display my nano-10's RTC on a software HMI. I use the modbus holding registers for hours, minutes and seconds. Hours and minutes works fine but the seconds skips every other value. The software HMI are supposed to have a poll rate of 500ms.  What could be wrong?

8
Technical support / Re:Programming help
« on: September 06, 2013, 09:20:40 AM »
Thank you very much Gary.

9
Technical support / Programming help
« on: September 05, 2013, 10:20:36 AM »
Need some help with a programming problem.

We assumes that DM1-48 contains various reading from a ADC. I want to identify the highest and lowest of the readings. Any good suggestions?

10
Technical support / Re:Serial communication
« on: June 17, 2013, 10:27:54 AM »
The baud rate and other parameters are the same.

The manual to the MCU states that the PRINT command (which I trying to use) attaches a new-line character to the transmission. Is a new-line character the same as carriage return? It sounds a bit similar.

11
Technical support / Re:Serial communication
« on: June 16, 2013, 07:42:42 AM »
Ok, I have a Rs232 to 485 converter  which I used together with a PC and Hyperterminal to send ASCII data to my Nano. I also tested to send character strings from the MCU to my PC.

 I have not been able to send data from the MCU to the Nano using the same converter plugged into the MCU development board.

Any idea why this isn't working when they both can communicate with my PC.

12
Technical support / Serial communication
« on: June 13, 2013, 09:48:19 AM »
Hi,
I have a small and cheap MCU with a Rs232 interface which I have some plans to use building a wireless sensor. Is it possible to make the MCU communicate with a Nano-10 using a RS232 to 485 converter? I have done some "sucessful" tests with a PC and hyperterminal together with a Nano, but connecting the MCU with the Nano-PLC maybe isn't the same thing?

13
Technical support / Ambient temperature
« on: May 15, 2013, 09:25:38 AM »
What's the recommended ambient temperature for your PLCs? And can high surrounding temperature affect the PLCs performance in a huge way?

14
Technical support / RS485 communication
« on: April 29, 2013, 09:03:46 AM »
If you use RS485 to interface a Nano-10 and a HMI touchscreen. Do you need termination and biasing resistors even if they are mounted close together in the same cabinet?  

15
Technical support / Virtual LCD
« on: April 25, 2013, 09:42:21 AM »
How can I display a degree symbol on the nano virtual LCD. CHR$(186) works on the monitoring LCD in the development software but not on the web page LCD.

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