Black Box IC821A Universal RS-232 to RS-422/485 Converter, Opto-Isolation, 2 Ports
Black Box IC821A Universal RS-232 to RS-422/485 Converter, Opto-Isolation, 2 Ports
Black Box IC821A
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- 1 Year Warranty
- 30 Day Returns
- Carbon Neutral
Product Key Features
- Transmit data up to 115 kbps or at distancesup to 4000 ft.
- Operates in point to point or multipoint applications
- Operates 2-wire half-duplex or 4-wire half- or full-duplex.
- async (data leads) only.
- Up to 32 RS485 devices can be attached to create a large multi-drop network
- The RS485 driver is automatically enabled during each spacing state on the RS232 side.
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Black Box
IC821A
The BLACK BOX® Universal RS-232 to RS-422/485 Converter with Opto-Isolation isolates and converts RS-232 signals into RS-422/RS-485 signals and vice versa. Unlike other converters, external software is not required to control data flow. The RS-232 input is wired for DCE through a DB9 female connector, and RS-422/RS-485 signals are interfaced through a removable terminal block. To supply external power to the terminal block, you need our 120-VAC/12-VDC Wallmount Power Supply (PS1003).
For RS-232, the connection requires RD, TD, and Signal Ground.
In RS-422 mode, the driver is always enabled for full-duplex communications. A twisted pair is required for transmit, and a twisted pair is also required to receive. A ground reference wire is also needed. Switch settings are Switch 1: RS-422; Switch 2: Echo On; Switches 3 and 4: 4 Wire.
In both RS-485 modes, the RS-485 driver is automatically enabled during each space state by the presence of an RS-232 signal. When the RS-232 data is in a mark or idle state, the RS-485 driver is disabled and the RS-485 data lines are held in a mark state by the bias provided by a 4.7-ohm resistor; the value of this resistor may need to be changed, depending on the termination you use.
To connect to several RS-485 devices with minimal wire, select the unit's 2-wire, half-duplex RS-485 mode. When data is requested, the addressed device transmits and then reverts back to receive status. Switch settings for this mode are Switch 1: RS-485; Switch 2: Echo Off; Switches 3 and 4: 2 Wire.
For 4-wire master/slave circuits, select the unit's 4-wire, full-duplex RS-485 mode. In this mode, addressed devices can receive data while transmitting data from a previous request. When used as a master in a single-master system, Switch 1 may be selected because the unit is the only transmitter in the system. When used as an RS-485 slave, the RS-232 device must provide addressability. Biasing in a master/slave system is provided by the end-of-line slave. Switch settings for this mode are Switch 1: RS-485; Switch 2: Echo On; Switches 3 and 4: 4 Wire.
Return Policy |
Time to Return |
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Standard Return Policy |
We offer a hassle-free 30-day returns policy for domestic (US) orders, excluding non-refundable items. Refund or Replacement within 30 days of the delivery date. All products that fall under the Standard Return Policy qualify for our 30-Day Hassle-Free Returns. Please see the section above for more details. |
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Replacement Only Return Policy |
Replacement within 30 days of the delivery date. |
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Manufacturer Only Return Policy |
Covered by the manufacturer's warranty. Please refer to the terms and conditions for the manufacturer's warranty or contact the manufacturer. |
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Holiday Extended Return Policies |
Extended Holiday Return Policy.Qualifying purchases of products displaying the " Extended Holiday Return Policy ", from November 1st, 2023 to December 25, 2023, are eligible for a Refund or Replacement until January 31, 2024. Extended Holiday Replacement-Only Return PolicyQualifying purchases of products displaying the " Extended Holiday Replacement-Only Return Policy ", from November 1st, 2023 to December 25, 2023, are eligible for a Replacement until January 31, 2024. |
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