Cabling Recommendations; Figure 20: Rs-485 Networking - FGD FlameSpec IR3 H2 HD User Manual

FlameSpec IR3 H2 HD User Manual F140V0020.07
each repeater) up to 247 on the same 4 wires. Using the RS-485 network, it is possible to read
each detector's status (fault, alarm) and to initiate a BIT to each detector individually.
The detector communicates via RS-485 with a Modbus RTU compatible protocol. For more
details on the communication protocol, please see manual F100P0013

Figure 20: RS-485 Networking

Cabling Recommendations

The cable used should be appropriate for the hazardous area classification and meet local,
national and company regulations.
In order to comply with EMC regulations, the cable must be shielded and the detector grounded.
The use of industrial grade, suitably armored field cable is recommended). When using HART®
communications, there are some additional considerations. In particular, low capacitance cable
should be used. Further detailed information can be found at the HART® Communication
Foundation's website www.hartcomm.org .
For ethernet cabling, it is recommended to use at least CAT5 shielded.
For analog video cabling, 75 Ohm - analog video patch cable or shielded twisted pair.
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