3001 SDI-12/MODBUS Interface Cable, 15ft
One end of this cable has wires that connect to a MODBUS controller. The other end of the cable terminates in a Direct Read connection. This connects to the top of a Direct Read Cable for connection The MODBUS Interface Cable circuitry requires a 12V connection, which is to be powered by the customer equipment.
Note: The power may be cycled off and on, and normally, no energy will be used for an LED indication.
MODBUS communication uses the RTU mode over a half-duplex, aka 2-wire (plus ground), It uses the standard MODBUS default settings of 8-e-1 (8 bit, even parity, 1 stop bit), but also supports 8-o-1 and 8-n-2. The default device address is 1, but it supports all up to 247. This interface uses 19,200 baud by default, but also supports 1200, 2400, 4800, 9600, 38,400, and 57,600 baud. Note that the idle current consumption of the cable will be slightly elevated while using MODBUS with baud rates above 9600.
The MODBUS interface applies under 1/256 of an RS-485 load unit to the bus, allowing a large numberof devices. The MODBUS transmitter is current limited, but drives up to 5V differential, suitable for longdistances. The MODBUS receiver applies an internal “fail-safe” voltage bias, which causes an open or short circuit busconnection to appear “idle”, from the perspective of the interface cable. While this causes the receiver to be difference to system performance in all but extreme cases. In the standard product configuration, the MODBUS interface, does NOT contain a bus terminator. It is the responsibility of the installer to determine if, where, and what types of bus terminators may be needed in the system as a whole. Similarly, while the MODBUS Interface Cable is supplied with some length of wire, it is up to the installer to suitably limit the length of any wire configured as a stub, anywhere along their bus infrastructure.
Note: When powering on, provided that the cable is not in Off-line mode, there will be a slight delay before the cable goes on-linewith the MODBUS controller.
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