At a minimum you should start with free space loos calculation, you can find several simple calculators online. You will need to know the frequency of the radio, distance between the master and remote radio, and the gains of both antennas. You also need to account for transmission line...
What do you mean by "ordinary wireless device"?
There are industrial IO wireless links that will do what you are looking for, operating in the 902-928 unlicensed band that are not consumer grade wireless.
You could install one radio at each end with yagi antennas.
In short, yes. Its done all the time.
If the switches have SFP ports, I would use SFPs instead of fiber converters. If you only have copper ports available, then the fiber converters are your only real option.
Now, the fiber type and converters will dictate overall speed of the link. If the...
Not really sure what you’re asking here, not enough detail provided.
Are you looking to extend a LAN/L2 or a WAN/L3 connection between buildings/facilities?
Is this your dark fiber, or is this coming from a service provider?
Makes a difference…
If you have a RS-485 to 232 converter (assuming you have an RS-232 port on a PC), you can download a trial version of ModSIM. The ModSIM software will show the MODBUS communications and you can see the RTU IDs that are being polled.
The NEC code would be more aligned with safety that maintainability. Look up BICSI standards regarding fiber. Service loops are always recommended. Its easier to perform one mid-span splice using a service loop than creating two splices, fitting a piece of cable.
Are you referring to your front end polling system, or field components?
If you are referring to the front end system, your best bet would be to hire a consulting company. They can review the programming and advise on CRM procedures adn compliance. A company like Enersys could help.
If you are...
I cannot speak to the code, as I don’t know it verbatim, nor for your area… But, the generally accepted proper way to run cabling from a cable tray to instrumentation would be to install the cable in conduit. I don’t think anyone allows direct burring of cable, or a dangling free run...
Depends on the spec of the UPS in question. Many higher end units have the option to auto adjust to the input voltage. Others have a manual adjustable input, either through switches or strapping.
A typical access control system would normally have sufficient inputs and outputs to allow for the required programming to provide door activations and inhibit signals to do what you’re looking for.
I would consult a qualified access control vendor on this though, as most areas require these...
We have a site with a 900 MHz ISM band data radio (902-928 MHz FHSS), connected to a pair of Yagi antennas through a phasing harness. The antennas are stacked vertically as per manufacturer’s instructions to increase directional gain.
What would be the result if one of the Yagi antennas were...
Serial communications were never really meant to be run over controls cabling (salt & pepper). The main issues isn’t voltage drop, its line capacitance. A larger diameter cable will shorten your maximum effective communications distance. Comms links should be made via 22 or 24 AWG twisted pair...
Of course, if you have a true point to point T1, you can use a simple T1 Ethernet extender. It’s basically a bridging device that negates the need for a true routed network. They are available in single port and multi-port models that allow multiple devices to interconnect between sites.
I...
I guess the first question is, are these point to point T1s?
Are they full T1s or fractional T1s?
Unless I’m missing something, you need a router at each site. The Westel box is usually a network interface card that allows the telco to monitor and test (loopback) the T1 remotely, more commonly...
For RF lightning/surge protection devices, I recommend Polyphaser. Their site has a lot of information on the appropriate devices, proper grounding and bonding techniques, and application spec sheets...
RS-232 current loop converters generally have 4 wires (TX+&-, and RX +&-), not three. Is it possible that in your configuration, the - lead from botht the TX & RX lines were tied together? What type of converter are you using?
When links are not properly configured, they will often work over...
I’ve installed several of these, and we typically use either rigid metallic conduit or PVC, but always use outdoor rated (OSP) cat-5 cable. I only use the shielded Cat-5 if I’m in a high noise environment (near electrical lighting, high voltage, or variable frequency drive units). Running...
If the PLC comes with a pre-configured default IP address, it should be listed in the manual. You would need to hard code an IP address on your PC to be on the same LAN as the PLC, and then direct connect to it. You will likely need to use a crossover Ethernet cable when direct connecting to the...
The folks at Tactical Software have a comm port redirector package called Serial/IP that allows legacy serial based applications to make TCP/IP connections. Basically you set up the redirector on a virtual comm port, and then connect the serial application to that comm port.
Here is the link, I...
