Hello team,
One of our customers needs a 20m extension cable for the Netbiter tank sensor, and we have only a 5m option (SP1627). Can the customer connect 4 of those to each other to reach 20m? Would the connectors allow it? Is there any technical issue by doing so?
Best regards**,**
Eduardo Giancristofaro
Sales Manager – Latin America
HMS Networks
Email: edg@hms.se
Mobile US: +1 (954) 995-4727
Hi Eduardo,
There really isn’t an exact answer to this. They might be able to just string a few extension cables together but this might not be the best option.
The Tank sensor uses a RS-485 connection. The Tank sensor cable provided is designed to connect to the sensor and provides the RS-485 connection and supplies power though additional wires in the cable.
We can refer to the RS-485 spec for its limits. For the signal limit. which with the correct baudrate can operate at 1200 m.
RS-485 supports inexpensive local networks and multidrop communications links, using the same differential signaling over twisted pair as RS-422. It is generally accepted that RS-485 can be used with data rates up to 10 Mbit/s[a] or, at lower speeds, distances up to 1,200 m (4,000 ft).[2] As a rule of thumb, the speed in bit/s multiplied by the length in metres should not exceed 108. Thus a 50-meter cable should not signal faster than 2 Mbit/s.[3] - https://en.wikipedia.org/wiki/RS-485
Rather then using multiple cables I would recommend sourcing a cable that is the correct length needed and attaching the needed connector for the sensor.
Give me a call and we can further discuss this over the phone if you would like.
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