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Decoding/decrypting Modbus messages in hexadecimal is awkward enough, but your message is encrypted in ASCII character codes. You might consider investigating whether the message display/interpretation can be displayed as hex, rather than ASCII. Here's a decoder table: <pre> Chr ASCII...

1. Use a 4-20mA source/calibrator to test the analog input. If the DC power wire got shorted directly to the conductor leading to the analog input, the resistor across the input could have been damaged by the overload. They're typically 1ow wattage resistors and can not handle 24V for any...

It's possible and sometimes it works OK. Other times it doesn't and then you'll need a signal splitter that isolates the input from the outputs. It depends on the isolation of the analog inputs and the level of any common mode voltage between the analog input ground and the power supply...

It appears, from an earlier thread, that this is not a commercial sensor. http://control.com/thread/1497046113#1497046113

Can you provide a link to the communications manual for the CAM4/reader? One issue might be that the spec for the ASE2000 Version 2 says that it supports "Modbus serial (RTU and ASCII)" and the tab on hardware shows USB and serial ports, not Ethernet ports. If the slave is really Modbus/TCP...

Yes, it's true. As the previously cited thread relates, some Master/clients don't support Function Code 04 at the 3xxxxx address range. No FC 04 makes it difficult to get the 3xxxxx data values, for those who use those master/clients. I guess the argument for dropping FC 04 is that it's just...

Banner has a wireless gateway controller DXM100 with integral discrete inputs. They have an app note entitled "Sending a Text Message from a Q45BL" (Q45BL = wireless pushbutton input). A quick scan of the app note indicates that it uses the DXM100 controller with its cellular modem, an active...

It depends. Two examples Siemens Siemens DSIII keyboard/display parameter M9 is "Fault current upper/lower". Default values are 22.8mA for fault-HI, 3.6mA for fault-LOW. The values can be changed using HART. Honeywell Honeywell ST700/800 keyboard/display calls it 'FS Direction', a...

Can the SCADA software Master read the slave MCU's FWD/REV status register and then write that FWD/REV status to the VSD? An alternative is the Miille Applied Research Multi-Port serial port multiplier than can handle directing messages from multiple Modbus RTU masters to one or multiple...

You're right, it's not the USB/RS-485 converter. You've asked FC03 to read one register. The error code is 03 "Illegal Data Value". Here's what the MODBUS Spec says that error code means: "A value contained in the query data field is not an allowable value for server (or slave). This...

This should be the 'easy' fix: data acquisition for HMI/SCADA/DCS which is usually filtered and sampled with respect to the AC power frequency to minimize AC frequency noise on low level signals. Whatever is sampling the data should have its AC line frequency setting be changed from 60Hz to...

A PLC is a controller only that (with the correct I/O) can handle a continuous level signal from a level transmitter. But only a couple PLCs in a market of hundreds has an integral HMI for displaying data. So programming a PLC for level also includes having and programming an HMI to display a...

I am not familiar with Sensor Connection but they appear to specialize in engine exhaust thermocouples. The statement "become damaged" doesn't specify whether the damage is sheath, transition, internal, or lead wire damage. You might consider asking Sensor Connection what their explanation is...

I doubt you'll even need 14g, but what's the arithmetic for the total loop resistance tell you? a. Wire resistance 800m (2640 ft) of 12g wire resistance is 4.20 ohms *2 = 8.4 ohms 800m (2640 ft) of 14g wire resistance is 6.67 ohms * 2 = 13.34 ohms 800m (2640 ft) of 16g wire resistance is...

ASCO certainly does not recommend it; their limit is 10% over nominal "for short periods" https://s2.postimg.org/woa6vwgop/Coil_Voltage_operating_ranges-hi.jpg But it's a big world, lots of manufacturers. There might well be another vendor who says that 30% over nominal voltage is acceptable.

All pressure measurement is differential, that is, the measurement is made relative to, or with respect to, a reference pressure. A gauge or gage pressure measurement references local atmospheric pressure. A tire pressure gauge makes a gauge pressure measurement references atmospheric...

The 761 spec sheet says it has a characterizer. The 762 characterizer can characterize the output signal, according to the blurb in the 762 manual: https://s1.postimg.org/kt4q22mvj/Foxboro_762_characterizer.jpg Do a 3 point characterization, say, limit the output to 85% max: The 'input'...

My apologies for bad advice in my initial reply. I should have realized that a reply of any sort means that the slave recognized its ID, the CRC checked out and that the message was formatted properly for the slave to interpret and generate a reply, which means that the serial settings...

The response makes no sense whatsoever. I suspect that you have a serial port settings mismatch. The spec sheet says it is Modbus RTU so the word size should be 8 bits. Check your baud rate, parity setting, and the number of stop bits are the same for both the master (ModScan) and...

Does your 'machine control' software use the TEC9100 RS-232 communications port? What 'machine control' software is this? The only factory software the Tec 9100 manual: http://www.tempco.com/Engineering/TEC100Series.pdf mentions is device configuration software which uses a special...