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I just stumbled across this. Siemens has a TO500 multipoint temperature measuring system. It has a separate electronic box and a measuring lance with up to 48 temperature measuring points. The technology is some derivative of fiber optic technology. The temperature range it can measure...

Where do you read the -1.4"? xmtr's local indicator? loop meter? DCS/PLC/HMI? What is the measurement associated with the -1.4? - X1 weir high side depth? - X2 which is X1 weir high side septh minus X2 weir low side depths - something else What measurement value do you expect this...

If the device does not use 16 bit register addressing, it is not Modbus. Call it something else. There are no 'holes' in your original Modbus map. There's data in those so-called 'holes; the remaining 16 bits of a 32 bit floating point value, in your example registers 11 and 13. A...

1. I can't find your 168 page manual. The 120 page manual I found http://www.hipowersystems.com/downloads/file_145_dse7200-7300_user_manual.pdf says: default Modbus settings are 19.2K baud, Modbus slave address 10 (presumably decimal). Are you polling slave 10 at 19.2K baud? 2. The...

I'm not clear on what is meant by "negative 4-20". 4-20mA is only 'negative' when a mA meter is connected backwards in the current loop circuit (or across the test terminals). Are the meter probe leads plugged in backwards (red in common, black in V/mA?) Or did you mean low pressure...

Let's make sure it is understood what you are trying to do. 1. You want the recorder (the Modbus master) to read values from the Aztec 600 analyzer (a Modbus slave), correct? If not that, what? 2. What are the names of the values in the Aztec that you want to read?

Would you please post a link to the manuals that include the Modbus information for the Aztec 600 and the RVG200 recorder?

In the first 10 google hits a spec sheet for IDP20 did not appear. What is an IDP 20? A DP or gauge pressure transmitter? If DP which side is connected to the bubbler dip tube? Is the other side connected to the vapor area at the top of the tank or open to atmosphere? What is the...

Yes, you can use Function Code (FC) 03 to read multiple Holding Registers. The format of the FC 03 command message is slave address (one byte) Function Code (one byte) = 03 Starting address Hi order (one byte) Starting address Low order (one byte) Quantity of registers Hi (one...

One vendor recently announced HART compatible AI cards. I read their spec and their manual and did not understand whether I could tag multiple variables from a multivariable device, like a Coriolis flow meter. I pressed them for an answer and after a lot of hemming a hawing the vendor...

Nope, never even heard of one until today. Their web site does not appear to offer download of a manual, so generic Modbus advice applies: 1. You might be reading the wrong register, an input register rather than a holding register, or an adjacent register because of the one-offset due to...

Wow, nice ASCII art. 1. Jumper TxA and RxA; TxB and RxB. No you've got 2 wire half duplex that will connect to D+ & D- 2. A (TxA/RxA) should be (-) and connect to D(-); TxB/RxB should be (+) and connect to D(+). 3. Be aware that vendors do not always label the driver lines...

I have updated firmware on dozens of process field devices and I'm not sure what protocol was used to transfer the firmware file because it didn't matter; the device vendor provided the software to make the file transfer and provided the firmware file. I just went through the motions. File...

I'm only marginally familiar with what is inside the surge protection devices the transmitter vendors sell - something that shunts a surge to ground; not something that 'absorbs' the energy. I checked out the Crouse-Hinds MTL TP-48 surge suppressor spec sheet and found an interesting...

Several years ago an Emerson rep noticed that a DP was close coupled to the manifold for an averaging pitot tube and was concerned that the conducted heat would degrade the performance and kill the transmitter. But it had already run satisfactorily for some time. Emerson investigated wrote up...

Spray paint the tube black with 'exhaust' spray paint and use IR to measure the skin temperature.

> is transferred data manipulated like this? Yes. The precision of a measurement or calculation can be lost if a that value has to be represented merely as a whole number, so scaling factors are very commonly used to provide greater precision in the interpretation of the data. It is not...

Whoops, my mistake. You are reading from the correct default register. I finally found the regular manual with the default slave register map and the internal temperature is indeed at 31003 The key is that the register value is an integer that is 50 times the display value, which is...

You're probably reading the wrong register. From http://www.datanab.com/docs/MBus_IO/MBus_IoFlash/help/index.html (what appears to be the documentation for the programming for unit) "Modbus Register Addresses The modbus registers use a 16 bit signed integer data format by default, which...

Modbus is a protocol, a set of rules for transferring real-time data from the slave to the master/client or what you call a host. Modbus accomplishes data transfer when the Master sends a Function Code (FC) command to the Slave. The Function Code typically 'reads' some data from the slave by...