• Fast RS485 <=> RS485 auto TX-enable repeater for 2-wire, communications, in point-to-point or multi-drop communications networks, at distances up to 4000 ft. and data rates up to 115.2Kbps.
• Can be used to extend both the distance and/or number of units/nodes on an RS485 (2-wire) network.
• Galvanic (Opto/Xformer) Isolation helps eliminate noise, and protects equipment form destructive transients found in industrial applications.
GENERAL DESCRIPTION and TYPICAL APPLICATIONS:
The DIFAR44 is a flexible repeater that can be used in 2-wire applications. The unit features Dual Isolation (transformer and optical), a wide power supply range (9 to 35VDC), edge mounted LED indicators, removable screw terminal strips, on-board transient protection, jumper selection for bias, termination, and operating modes.
The DIFAR44 is designed as a robust repeater for industrial applications and other applications (both indoor and outdoor) where galvanic isolation is important. This unit provides superior characteristics/features to solve a wide variety of communications problems. Can be used in point to point, and/or in 2-wire multi-drop repeater applications.
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DIFAR44A.pdf | Repeater schematic |
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DIFAR44B.pdf | Repeater schematic |
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DIFAR44S.pdf | Repeater schematic |
Click on an image for a larger view:
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PHYSICAL PROPERTIES and FEATURES:
| RS485: | 3-wire removable screw terminal interface (RX/TX+, RX/TX-, Common).and RJ11/12 connector. |
| Power: | Removable 2-wire screw terminal interface with full wave bridge input, for 9-35VDC (12-24VAC) operation, typical power is under 1.0 Watt. |
| RS485 Bias: | 620 Ohm pull-up and pull-down (on TX only, jumper selectable). |
| RS485 Termination: | 120 Ohm (jumper selectable). |
| Special: | Jumper selection for flexible operating modes, LED indicators. |
| RS485 Protection: | P6KE6.8A Transient Voltage Suppressors inside 1N4004 diode bridge on data lines. |
SPECIFICATIONS:
| Distance: | RS422/RS485 up to 4000 ft. (1250 meters) on each side of the interface. |
| Operation: | 2-wire half-duplex RS485 ó RS485 (2-wire) repeater. |
| Format: | Asynchronous data with any combination of bits, parity, stop. |
| Speed: | Up to 115.2Kbps+ (SP485CS driver ICs) |
| Temperarure: | 0-65C (32-150F) ambient. |
| Humidity: | 10-90% non-condensing. |
| Voltage: | 9-35VDC, (12-24VAC) |
| Power: | Under 1.0 Watt (typical) + external load |
| Size: | 4.50" X 3.50" X 0.9" (PC Board), with connectors: 5.00" X 4.00" |
| Mounting: | 4-Places 4.00" X 3.00" (built-in standoffs for #6 hardware) |
OPTIONS AND ORDERING INFORMATION: (MODEL DIFAR44):
| DIACR44: | $159.00 ea. (Circuit board only) |
| Enclosure: | $10.00 ea. (Large) |
| Cable: | None - screw terminal connections only |
| Supply: | $7.50 ea. (9VDC @ 200/300 mA wall power supply). |
| *DIFAR44 with all options: DIFAR44-BPS @ $176.50 ea. (Qty. 1-9) |
| Contact
Information: R.E. Smith, 4311 R. E. Smith Dr., West Chester, Ohio 45069 513-874-4796 Phone, 513-874-1236 Fax., rs485.com |
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