Network & Communication
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Black Box Async RS-232 to RS-485 Interface Converter - 1 x DB-9 RS-232 , 1 x DB-9 RS-485
- Operates in half- or full-duplex over two or four wires.
- Works with or without transmit "echo."
- Also available in four other configurations. See Similar Products.
The Async RS-232 to RS-485 Interface Bidirectional Converter, DB9 Female to DB9 Female, features a DB9 female connector on the RS-232 side, and a DB9 female on the RS-485 side. It converts your unbalanced RS-232 signals to balanced half-duplex RS-485 signals. Learn More$131.84 -
Black Box IC620A-F RS-232/485 Converter - 1 x DB-9 RS-232 , 1 x RS-485 Terminal Block - External
- Features one DB9 female and one terminal block connector; other connectors available (see Related Items).
- Built-in silicon avalanche diode surge protection against data loss and equipment damage from transient surges.
- You can also "fine tune" impedance and "echo" characteristics for your individual application.
- For configuration, the converter features two internal 4-position DIP switches.
Learn More$116.69 -
Black Box IC623A-F RS-232/485 Converter - 1 x DB-9 RS-232 , 1 x RJ-11 RS-485 - External
- The RS-232 connector is DB9 female; the RS-485 connector is RJ-11; other connectors are available (see Related Items).
- Built-in silicon avalanche diode surge protection against data loss and equipment damage from transient surges.
- You can also "fine tune" impedance and "echo" characteristics for your individual application.
- For configuration, the converter features two internal 4-position DIP switches.
Learn More$116.73 -
Black Box IC624A-F RS-232/485 Converter - 1 x DB-9 RS-232 , 1 x RJ-45 RS-485 - External
- The RS-232 connector is DB9F; the RS-485 connector is RJ-45; other connectors are available (see Related Items).
- Built-in silicon avalanche diode surge protection against data loss and equipment damage from transient surges.
- You can also "fine tune" impedance and "echo" characteristics for your individual application.
- For configuration, the converter features two internal 4-position DIP switches.
$116.69 -
Black Box Async RS232 to RS422/485 Interface Converter - DB9 to Terminal Block - 1 x DB-9 RS-232 , 1 x Terminal Block - External
- Enables you to select RS-485 2-wire half-duplex or RS-485 4-wire full-duplex operation.
- Selectable RS-422 operation with transmit and receive always enabled.
- Automatic RS-485 driver control, so it works without any special programming for handshaking signals. Also enables transmitter from RS-232 TD signal and receiver when not transmitting.
- Built-in bridging switches for 2- or 4-wire operation with no external jumpers to set.
- Set operating mode with four switches.
- Converts using either port power or power from an external 120-VAC/12-VDC power supply (sold separately).
- No external power is required if two RS-232 output handshake lines are available.
$121.49 -
Black Box Async RS232 to RS422/485 Interface Converter - DB9 to Terminal Block - 1 x DB-9 RS-232 , 1 x Terminal Block - External
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).
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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.$152.14
