The USB-to-RS485 Converter Board can connect up to 31 meters and counter on an RS485 bus to a computer with a USB port. It features a USB Type-B connector for connection to a PC via a standard USB cable, plus an RJ11 jack for interface to an RS485 bus which can support up to 31 meters equipped with RS485 interface board. That board features dual RJ11 connectors for RS485 daisy-chaining using commercial 6-wire RJ11 data cables, with no need for a hub.
USB serial communication board allows a digital panel meter, counter or timer to be interfaced to a PC with an available USB port. Its primary use is as an alternative to the RS232 board for programming, since most new computers now feature multiple USB ports as opposed to RS232 ports. As for the RS232 board, connection to a PC allows programming via Windows-based Instrument Setup Software, or to output readings to a PC for display and datalogging. The USB board is shipped with a driver on a mini CD ROM.
The RS485 Modbus interface board is identical to the RS485 Interface Board, except that it uses 8-wire RJ45 jacks as recommended by the Modbus standard, as opposed to 6-wire RJ11 jacks. Both boards are equally compatible with the Modbus RTU and Modbus ASCII protocols.
With the dual-output version Option “C2” for the Counter Meter, either output can be selected as 4-20 mA, 0-20 mA, or unipolar 0-10V. The ground of the two outputs is shared. One of the outputs would typically be tied to the displayed item, while the second output may be tied to a non-displayed item. For example, with the extended frequency meter, Item #1 can be assigned to rate, while Item #2 is assigned to total.
Optional plug-in setpoint controller boards are available to add control and alarm capability to 1/8 DIN DPMs, counters, timers and remote displays:
Four contact relays Contact relays rated 8A at 250 Vac or 24 Vdc
The contact relays are rated for 8A at 250 Vac or 24 Vdc and are recommended for high currents. The quad contact relays are normally open (NO) Form A relays and share a common isolated ground in pairs.
With this option, a Form 3 instrument can switch power for control action in all types of open-loop or ON-OFF closed-loop operations. It may be used, for example, to actuate alarms or sorting devices, or to start up or shut down external processes. Both relay types are controlled directly by the unit's LIMIT VIOLATION outputs.
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