This device is perfect for multiple serial
conversions—plus it’s opto-isolated.
This device is perfect for multiple serial
conversions—plus it’s opto-isolated.
Universal RS-232 to RS-422/RS-485 Converter, Opto-Isolated
© 2007. All rights reserved. Black Box Corporation.
FREE 24-hour Tech Support: 724-746-5500
blackbox.com
8/3/2007
#26796
TECH SPECS
Interface —
RS-232, 4-wire RS-422, or 2- or 4-wire RS-485
Connectors —
(1) DB9 female; (1) 5-wire connector for TD A(-), TD B(+),
RD A(-), RD B(+), and GND; (1) 2-wire connector for Power and GND
Indicators —
(2) LEDs: (1) TD, (1) RD
Power —
From the interface or from optional 120-VAC/12-VDC
wallmount power supply
Size —
1.7"H x 3.9"W x 0.9"D (4.3 x 9.8 x 2.3 cm)
Weight —
< 0.1 lb. (< 0.1 kg)
Item
Code
Universal RS-232 to RS-422/RS-485 Converter, Opto-Isolated
IC821A
For an optional power supply, order…
120-VAC/12-VDC Wallmount Power Supply
PS1002
FEATURES
• Converts RS-232 to 4-wire RS-422 or to 2- or 4-wire
RS-485.
• Bidirectional data conversion.
• Select RS-485 2-wire half-duplex or RS-485 4-wire full-
duplex operation.
• Optically isolated circuits protect the converter from
overvoltage damage caused by ground loops, surges,
and spikes.
• RS-422 operation with transmit and receive always
enabled.
• Set operating mode with four switches.
• 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.
• Converts using either port power or power from an
external 120-VAC/12-VDC power supply (PS1002,
ordered separately). No external power is required if
two RS-232 output handshake lines are available.
