Communications Wiring - Chentronics iScan 3 Manual

TOLERANCE NOTES
FABRICATED TOLERANCES
≥ 2 ft (610 mm) ± 0.250 in (6.4 mm)
< 2ft (610 mm) ± 0.125 in (3.2 mm)
MACHINED TOLERANCES
± 0.050 DECIMAL DIM (1 PLACE)
± 0.010 DECIMAL DIM (2 PLACES)
± 0.005 DECIMAL DIM (3 PLACES)
Ne pas connecter ou débrancher

4.5 Communications Wiring

RS-485
Communication with the iScan®3 Flame Scanner is RS-485 via a USB to RS-485 Converter (PN 3425-057-
01). RS-485 is a differential multi-drop network. For iScan®3 Flame Scanner, the network is a half-duplex,
2-wire, echo-off configuration operating at 19200 KBAUD. The maximum allowable number of nodes on
a given section of the network is 32, including the USB to RS-485 converter and any repeaters. If more
than 32 loads are connected (1 USB converter, 1 RS-485 repeater, and 30 iScan3s), then an RS-485
repeater is required between sections to boost the signal. The repeater must be compatible with the EIA-
485 standard, have input to output DC isolation, operate on 24VDC over the operating temperature range
of 0°C to +70°C, and have agency approvals sufficient to meet the area classification.
NOTE:
repeaters in a section). For the extended sections, up to 30 iScan3s may be connected. The
maximum length of any given section is 4000 FT (1200 M).
B&B Electronics 485 repeater model 485OPDRI-PH meets these requirements. Additional repeaters may
be added to extend the network to 127 scanners. If using the B&B Electronics 485 repeater model
mentioned above, configure the DIP switches on ports as follows:
Since there is no dedicated signal reference, the 24 VDC return labeled as DC (-) is used. The USB to RS-
485 and the Repeaters must also have their GND terminals connected to the DC (-). Failure to provide the
signal reference may result in communication errors and potentially damage the iScan®3 Flame Scanner.
The recommended topology is "Daisy Chain," as shown in the wiring diagrams below. A split or Y
configuration is acceptable. NO OTHER CONFIGURATION IS ACCEPTABLE. Please refer to the EIA-485
specification for further information on RS-485 networks
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CHENTRONICS.COM/LEGAL-NOTICES
ISO 9001 CERTIFIED
DRAWN BY:
ON:
2021-MAY-14
AR
LAST REV BY:
ON:
2022-AUG-01
AR
MNL-ISCAN3
RISQUE D'EXPLOSION
lorsqué énérgé
When calculating 32 loads, include the USB to RS-485 converter and the number of
1 2
ON ON
iScan®3 MANUAL
DCO No
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14724
DWG. No.
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