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BAM 1020-9805 with CR850


CyannaHicks Apr 17, 2024 08:51 PM

I am trying to set up a Met One BAM 1020-9805 (touchscreen, ethernet port) with a CR850 datalogger. I have my datalogger connected to a NL201, which is then connected to an ethernet switch. I then have both the BAM 1020 and a modem connected to the same switch. I can remotely access the BAM through Met One's software. I am able to get to both the datalogger and modem remotely as well, my problem seems to be in the programming for the datalogger. Here's what I have for a very simple test program:

Public Result_

BAM

Public Socket_BAM

Public Shop_BAM(1)


BeginProg 

     Scan(5, Sec, 1, 0)

          Socket_BAM = TCPOpen("10.10.10.42", 7500, 300, 20)

          ModbusMaster(Result_BAMSocket_BAM, 9600, 1, 4, Shop_BAM(1), 1, 1, 2, 200, 1)

     NextScan

EndProg

Meanwhile, here's the relevant settings on the BAM:

RS-232: 9600 (baud rate)

Flow Control-232: NONE         

RS-485: 115200 (baud rate)


Modbus Port: RS-232 

Modbus Address: 1     

Byte Order: 512

IP Config: Static,  DHCP

IP Address: 10.10.10.42,  10.10.10.42:7500   

Subnet Mask: 255.255.255.0,  255.255.255.0       

Gateway: 10.10.10.1,  10.10.10.1

While the program is running and the BAM is plugged in, the Result_BAM variable counts up by one each cycle, which indicates there's a comms failure. The Result_BAM variable correctly shows a -11 value when the BAM is unplugged, so it's recognizing something when it's plugged in. If anyone has any insight, it would be much appreciated, I am new to networking.


Sam May 6, 2024 01:43 AM

Does Socket_BAM take on a value >100?

A IPTimeOut value of 20 is very short. I suggest changing to >100 (default is 7500)

The settings on the BAM seem to indicate Modbus over RS-485. It is unclear from this if the BAM is serving up Modbus over TCP/IP.

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