• Fast auto TX-enable RS485 (2-wire, half-duplex) or RS485/RS422 (4-wire, full-duplex, fixed enable or auto TX-enable) for multi-drop, and/or point-to-point networks.
• Fast auto TX-enable RS232 <=> RS485 interface converter for 2-wire, half-duplex communications, or fixed/auto TX-enable RS232 ó RS485/RS422 interface converter for 4-wire, full-duplex, point-to-point or multi-drop communications, at distances up to 4000 ft. and data rates up to 115.2Kbps.
GENERAL DESCRIPTION and TYPICAL APPLICATIONS:
The RSCOM2A is a fast Async bi-directional RS232 <=> RS485 interface converter for 2-wire, half-duplex applications, with an automatic TX enable circuit, that will operate at data rates up to 115.2Kbps. The unit can also be used in 4-wire RS485/RS422 application (point-to-point or multi-drop, full-duplex). The unit has jumpers for bias, termination, RS232 DTE/DCE selection, and operating mode settings. The unit has edge mounted LED indicators, a removable screw terminal connector, and uses SN75LBC184P limited slew rate transceivers (1/2 unit load) with built-in transient protection.
The RSCOM2A is designed for office and/or industrial applications (non-isolated), and provides superior characteristics/features normally found only on more expensive units.
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RSCOM2A.pdf | Converter schematic/physical |
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PHYSICAL PROPERTIES and FEATURES:
| RS232: | 3-wire interface to RJ11/12 Connector (TX, RX, Common). |
| RS485: | Removable screw terminal (Common, TX/RX-, TX/RX+, RX-, RX+, Common). |
| Power: | 2.1mm center positive "Barrel" connector (9VDC)and Wago terminals. |
| LEDs | Power(YEL), TX-RS485(RED), RX-RS485(GRN), TX-RS232(RED), and RX-RS232(GRN) |
| Bias: | 620 Ohm pull-up and pull-down (jumper selectable). |
| Termination: | 120 Ohm or 240 Ohm (jumper selectable). |
| Special: | Switching regulator for 9-35VDC operation. |
| Protection: | Up to 400W typical per SN75LBC184P specification |
SPECIFICATIONS:
| Distance: | RS485/RS422 up to 4000 ft. (1250 meters). |
| Operation: | 2-wire, half-duplex RS485 or 4-wire, full-duplex RS485/RS422. |
| Format: | Asynchronous with any combination of data bits, parity and stop. |
| Speed: | Up to 115.2Kbps (slew limited driver). |
| Temperarure: | 0-65C (32-150F) ambient. |
| Humidity: | 10-90% non-condensing. |
| Voltage: | 9-35VDC. |
| Power: | Under 1/2 Watt (typical) + external load. |
| Size: | 3.50" X 3.00" X 0.9" (PC Board), with connectors: 3.50" X 3.25". |
| Mounting: | 4-Holes 3.00" X 2.25" (built-in standoffs for #6 hardware). |
OPTIONS AND ORDERING INFORMATION: (RSCOM2A)
| RSCOM2A: | $69.00 ea. (Circuit board only). |
| Enclosure: | $10.00 ea. (Medium). |
| Cable: | $7.50 ea. (RS232, 7 ft., Specify DB9F-7 or DB25F-7). |
| Supply: | $7.50 ea. (9VDC @ 200/300 mA wall power supply). |
| *RSCOM2A with all options (DB9F cable): RSCOM2A-B9FPS @ $94.00 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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