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RS232HTS: Non-Isolated Full Duplex RS232 Repeater/Concentrator


RS232HTS with Box

RS232HTS Label

"Let me spin a very large
RS485 network for you!"


Product Features

  • This RS232 unit features bi-directional serial communications from the Master Port to the 3 independent Distribution Ports. Units are cascadable to increase the number of Distribution Ports.

  • As a repeater, data received into the Master Port is simultaneously transmitted out all Distribution Ports. Typical application is distributing data to displays, signs, cameras, and lighting controllers.

  • As a concentrator, data received into any of the distribution ports is transmitted out the Master Port. Typical application is collecting data from key pads, alarm points, and intrusion sensors.

  • As a concentrator, data collisions can occur if data is received simultaneously into the distribution ports. To minimize this problem, devices will typically transmit data infrequently and in a short burst.

  • Transparent to all asynchronous data, with any combination of data, parity, and stop bits at data rates up to 115.2Kbps.

  • Edge mounted LED Indicators for power and master port data activity.

  • A polarity protected efficient switching power regulator accepts supply voltages from 9 to 35 VDC(0.5 Watts max.)

  • Jumpers allow the Master RS232 Port to be configured as DTE or DCE.

  • User connections are an RJ11/12 telephone style connector(RS232 Master Port), 3 pin Wago style spring loaded terminal strip(RS232 Master and Distribution Ports), and a 3 pin Wago terminal strip and a 2.1 mm barrel connector(power).

  • Broad environmental range: -40C to +85C(-40F to +185F), 10 to 90% RH(non-condensing)

  • Four(4) easy mount through hole standoffs, which accept #6 hardware, are provided on the circuit board.

  • Accessories available are a 12VDC Switching Power Supply(Wall Wart), an enclosure, and a 7ft DB9F-7 to RJ11/12 RS232 cable.

  • We strongly recommend that a first time user of this product purchase the optional DB9F-7 to RJ11/12 RS232 cable.

  • The limitations of the RS232 communications method can be solved by the wide variety of R E Smith devices. Our converters, buffers, isolated converters, and addressable converters mitigate the distance limitations and electrical noise problems that contribute to unreliable communications and product failure.

  • Conformal Coating, other cables, and other connectors are factory options. If what you see here is not exactly what you need, don't hesitate in calling us at (513) 874-4796.

  • WARNING: Do NOT connect this device to a telephone system under any circumstances. Damage could result to the circuit board and/or your telephone system.

Product Description:

This device provides the unique ability to communicate to multiple RS232 devices without requiring an individual serial port for each device on the controller or computer. The EIA/TIA Specification RS232 ports are individually driven from buffers and not merely parallel wired.

As a collector or data concentrator, the possibility of data collisions, that render the received data unusable, must be considered. In many applications the data being sent is a short burst minimizing this possibility. This is typical in a small to medium sized keypad based access control system.

There are many schemes to overcome the collision problem. Among these are addressable target devices which only respond to their unique address, and random response times to a broadcasted transmit command.

About R E Smith, Inc:

R E Smith, Inc. engineers and manufactures a comprehensive line of isolated and non-isolated converters, repeaters, multiport repeater hubs, fiber optic based products, and I/O boards. All our products are designed, built, tested, and shipped from our facility in the Greater Cincinnati Ohio area. We ship small quantities of most products from stock the same day, and larger quantities in a few business days.

We listen to you. We are customer driven. Many of our products were developed and improved due to suggestions and feedback from our word-wide customer base. They are being used at the South Pole, at the bottom of the sea, at the edge of space, and everywhere in between. Typical uses are very large networks, monitor and control of elevators, machinery, lighting, security, fire and alarm, access, cameras, military ground support, and much more. We provide free support, no-argument warranty repairs, and recommendations for your application. Challenge us with your communications problem. We may already have the solution. If your system keeps failing, or is unreliable, we have isolated, doubly isolated, noise resistant, cost effective, and proven solutions for difficult environments.

Related Files:

pdf icon RS232HTSrevB.pdf Schematic
pdf icon RS232HTS-WD.pdf Connections


RS232 Dist Ports: 3 Pin Wago Style Terminal Strips
RS232 Master: RJ11/12 Telephone Style Connector, and 3 Pin Wago StyleTerminal Strip.
Power: 2.1mm barrel connector, and 3 Pin Wago Style Terminal Strip.
LEDs Power(Yellow), Master Port Data activity(TX: red, RX: green)


Distance: RS232: 10 to 100ft depending on data rate
Operation: RS232 to 3 individual RS232 distribution ports
Format: Asynchronous data with any combination of bits, parity, and stop (auto mode)
Speed: Up to 115.2 Kbps
Environmental: 0C to +70C ambient, 10-90% RH(non-condensing)
Supply Voltage: 9 to 35 VDC Provided by external power source
Power: Under 1/2 Watt(typical) + external load
Size: 3.5" X 2.75" X 1.4" (PC Board)
Mounting: 4 Holes at 2.25" X 3.0" (built-in standoffs for #6 hardware)

Options and Ordering Information:

RS232HTS: $149.00 ea. (Circuit board only)
Data Cable: $7.50 ea. (RS232, 7 ft., Specify DB9F-7 or DB25F-7)
Enclosure: $10.00 ea. (medium)
Power Adapter: $8.50 ea (wall wart type which meets California,
and most world wide safety and efficiency standards

This is the complete order number for the RS232HTS with all available options:

Order Number: RS232HTS-B9FSPS @ $175.00 ea. (Qty. 1-9)

Need a different configuration or more information? Give Ron a Call at 513-874-4796 or 513-638-0228(Cell)

Webstore: RS232HTS

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