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2 TECHNICAL DATA<br />
<strong>GFC</strong> <strong>300</strong><br />
2.1 General technical data<br />
Interface<br />
RS485, galvanically isolated<br />
Baud rate 1200, 2400, 3600, 4800, 9600, 19200, 38400, 57600 or 115200<br />
Protocol<br />
Maximum participants on bus<br />
Coding<br />
Modbus RTU (available as a separate document on request)<br />
32 per line, master included (may be extended by repeaters)<br />
NRZ bit coding<br />
Address range Modbus: 1...247<br />
Transmission procedure<br />
Bus access<br />
Cable<br />
Distances<br />
Half duplex, asynchronous<br />
Master / slave<br />
Shielded twisted pair for RS 485 applications<br />
Maximum 1.2 km / 3937 ft without repeater (dependant on<br />
baud rate and cable specifications)<br />
2.2 Technical data of the Modbus interface (acc. to EIA standards)<br />
Kind of signal transmission<br />
Maximum number of<br />
transmitter/receivers<br />
Voltage range on converter input<br />
Maximum voltage on converter output<br />
Minimum voltage on driver output, max.<br />
load<br />
Maximum input current (off state)<br />
Receiver input voltage<br />
Sensitivity of the receiver<br />
Receiver input resistance<br />
Short circuit current<br />
Termination / polarization resistors<br />
(if activated by the jumpers X5/X6)<br />
Differential, 2-wire topology<br />
32<br />
-7...+12 V<br />
5V<br />
U diff >1.5V<br />
-20...+20 μA<br />
-7...+12 V<br />
-200...+200 mV<br />
>12kΩ<br />
< 250 mA<br />
120 Ω / 560 Ω<br />
4<br />
www.krohne.com<br />
03/2012 - 7312402100 - AD Modbus <strong>GFC</strong> <strong>300</strong> R01 en
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