Model HT-91100, with RS232 Data Control

Microplate Orbital Shaker   

For Biotechnology, Genomics and Proteomics Processing
Our HT-91100 Microplate Orbital Shaker with RS-232 Data Control is designed to provide an orbital shaking motion for a single microplate, keeping liquids either gently stirred or fully mixed and in-suspension. Link-up to any PC with RS-232 serial data control. Rich ASCII command set with features such as programmable acceleration and velocity, precision auto-home positioning, status and velocity reporting, timed modes, scripts and complex shaking protocols. Drop in the ActiveX for your own development. Link over 35 units in a daisy chain to a single serial port. Ultra thin profile and exact same footprint dimensions as a standard SBS wellplate.


  • Rotationally shakes a single microplate.
  • 0.5, 1 or 2 mm orbital motion.
  • Full and rich ASCII command set, with sample VB6 PC interface.
  • Low stirring speed to ultra vigorous mixing and vortexing speeds for viscous liquids; 60 to 3570 RPM.
  • 24 VDC power for safe and easy integration with other automation.
  • Cold running motor allows continuous operation, weeks at a time.
  • Small number of precision components for extreme reliability over years of use.
  • Plastic spring clips secure microplate; easy on and off for robots or lab staff.
  • Base is same size as microplate & fits onto robotic decks without modifications. No extra control boxes.
  • Ultra-precise home positioning every time.
  • Buzz mode for resuspending stubborn sediment


This precision electronic shaker provides a tight 1 mm orbital pattern for standard 96 and 384 well plates and does not spill liquids at high speeds. It is designed with a programmable acceleration and velocity range of 60 to 3570 RPM, providing a gentle stirring motion for skin prevention, medium speeds to ensure liquids remain fully mixed and in suspension across all wells, and vortex mixing for sediment lift and re-suspension. Complex stirring protocols are a breeze.

The footprint of the unique HT-91100 Orbital Shaker is the same size as a SBS standard well-plate, and drops in easily as a replacement platform for robotic deck plates. All the controls are fully within the tiny enclosure.


Its solid aluminum construction does not allow walking or bouncing, and the nickel plating ensures easy wipe down from all chemicals. It has a broad operating temperature range of 0 to 160 degrees F, and it has negligible temperature rise itself, allowing operation continuously in cold rooms without affecting plate contents, and directly inside incubators.

Designed originally to enhance existing automation and robotics for genome sequencing and archiving applications, its tiny size, standardized SBS microplate footprint and in-well mixing ability make it ideal for many biotechnology, pharmaceutical, nanotechnology and chemical applications. These shakers are built-in to OEM products on dozens of liquid handling systems, and are exceedingly popular for researchers Worldwide.

Orbital Motion 1.0 mm diameter, circular shape, constant everywhere on well plate. 0.5 and 2.0 mm orbits optional.
Speed 60 RPM to 3570 RPM, programmable. Resolution 14 RPM. Acceleration/deceleration in range of 0-10 seconds. 7500 RPM top speed optional.
Power Required 24 VDC, 200 mA. 100-240 VAC 50-60Hz power adapter included. DC power receptacle on end of unit.
RS-232 Port 9600, 8, 1, no hardware data control. ASCII text characters with <CR> for end of line. RJ-11 connection on end of unit. Standard RJ-11 telephone cable, 6 foot, included. RJ-11 to 9 pin D-type PC serial interface connector supplied.
Base Dimension 3.350" (85mm) width, 5.030" (127.8mm) length
Microplate Platform Dimension 3.650" (92.7mm) width, 5.300" (134.6mm) length, centered on top of base. Secures a single wellplate with SBS footprint.
Height 1.215" (30.9mm) height from bottom of rubber feet to top surface of shaker table platform. 1.775" (45.1mm) height from bottom of rubber feet to the top surface of a standard well plate.
Weight 1.352 pounds (613.3 g)
Operating Temperature 0 F to 160 F  (-17.5 C to 71.0 C),  non-condensing, RH to 90%
LED Indicator Tricolor LED, green when at commanded velocity, yellow during acceleration or deceleration, red during home finding, on end of unit.
Serialization Each unit has unique electronic serial number.
Control Atmel AT89C51 microcontroller, 8-bit DA converter for speed control. 3-phase brushless servomotor drive, retro-reflective optical sensor for shaft position, velocity reporting and home index. Controls are fully within the shaker enclosure.
Motor Hi-torque 3-phase brushless DC servo motor and drive electronics with eccentric in precision bearing. Four post vibration isolators. Planar surface motion.
Homing Automatic homing after each cycle stop. 1.5 second. Accuracy +-0.001" (+-0.025 mm) to same location. Homing can be command disabled or enabled.
Material Aluminum, nickel plated, stainless steel hardware, white polypropylene clips. Hi-phosphor nickel plating available.
Warranty Two year limited replacement warranty.
Certifications CE certified for laboratory equipment, RoHS compliant.
EAN Codes EAN 0700371289522: HT-91100-0.5
EAN 0700371289539: HT-91100-1
EAN 0700371289546: HT-91100-2

RS-232 Serial Interface

You have full control of the shaker via RS-232 data. An ultra simple command set allows you to easily control acceleration, velocity, starting and stopping. Features include a precise home position every time the unit stops, electronically serialized units, text status output, an alternating dual speed mode with programmable seconds per speed, a timed mode, LED indicator and diagnostics. A daisy-chain mode allows over 35 shakers to be individually controlled on one serial port.

Interface is via an RJ-11 phone cable to a modular connector that plugs directly into your PC's serial port. Standard 9600, N, 8,1 data. All strings terminated with <CR>.

9-Pin RS-232 PC Serial Port Connector

RS-232 Command Set

Axx      Set acceleration value in range 0 to 10 seconds.
B          Immediate, uncontrolled brake action.
C          Disable finding of shaft home feature.
D          Disable motor driver, motor will free coast to a stop.
E           Enable the finding of home feature after the motor stops (default).
F           Find the home sensor.
G          Go, start the motor, using set velocity and acceleration.
Hxx       Set acceleration in range 0-10 for Cycle 1.
Ixxxx    Set velocity in RPM for Cycle 1, range 60-3570.
Jxxxxx   Set time, in seconds, that Cycle 1 lasts, range 0-30,000.
Kxx        Set acceleration in range 0-10 for Cycle 2.
Lxxxx     Set velocity in RPM for Cycle 2, range 0-3570. Set to 0 if Cycle1 timed mode only.
Mxxxxx  Set time, in seconds, that Cycle 2 lasts, range 0-30,000.
N           Begin continuous cycling between the two speeds set in Cycle 1 and 2.
O           Enable status text automatically sent over RS232 after a change (default).
P           Disable status text sent automatically, nothing is sent.
S           Stop the motor using deceleration values, then find home if okay to use.
T           Test the reflective optical sensor that finds the home index mark.
Vxxxx    Set the velocity for the next motion, in range 60 to 3570 RPM.
+           CW rotation motion (default).
-            CCW rotation motion.
U           Begin daisy chain mode and re-order shaker units.
@          Preface character for daisy chain addressing.
(           Turn off usage of LED status indicator.
)           Turn on usage of LED status indicator.
!            Re-suspension protocol, breaks up stubborn sediment.
~           Request a response for every command sent.

RS-232 Data Requests

?           Shaker sends this summary list of all available commands and simple descriptions.
?A         Shaker responds with A=xx, the currently set acceleration value, 0-10, seconds.
?V         Shaker responds with V=xxxx, currently set velocity, range 0-3570 RPM.
?R         Shaker responds with R=xxxx, measured speed value of the motor shaft in RPM.
Q          Request text status, unit responds with RAMP, RUN, STOP.
?W        Shaker responds with W=xxxx, internal commanded current velocity, RPM.
X           Shaker responds with the software version of the microprocessor, x.xx.
Y           Shaker responds with the serial number of the unit, A1234 (xxxxx).
Z           Shaker responds with model number, HT-91100.
$           Responds with a high speed data packet of status, commanded and measured RPM.

Sample test program to exercise all shaker features is available in VB. Source code is of course included for you to use as you wish in your own programs. A drop-in OCX is also available for your VB, C++ and .Net software development efforts.

We include a Windows based program for your PC to start using the shaker in moments.

CAD Views of HT-91100

CAD Bottom View


CAD Top View

Ordering Information

Standard Model:

Part Number: Model HT-91100-1, Microplate Orbital Shaker with RS-232 Data Control, 1 mm orbital motion
USD $1400.00 Quantity 1

Optional Models (no price difference):

Part Number: Model HT-91100-0.5, 0.5 mm orbital motion
Part Number: Model HT-91100-2, 2 mm orbital motion

Modifications Available per Model:

Containment Clip Material option: Standard polypropylene clip replaced with Delrin, polyethylene or nylon.

Containment Clip For Lid option: Higher clip design accommodates wellplate lid along with well plate. Let us know the model and brand of wellplate.

Increased Weight option: Handle loads up to 3 lbs. (1.4 kg).

Custom Shaker Platform: Tell us what bio-robot gripper design you are using and we will reconfigure the shaker platform to accommodate that gripper, generally at no charge.

7140 RPM High Speed option, doubles shaker speeds.

Accessory Items:

Part Number: HEAVYBASE, stainless steel block to solidly hold a shaker during full speed mixing. Used for prototyping or on your own custom platform to bolt down and securely contain a high speed shaker. Has rubber feet, finger grips for lifting. 8.5 lbs. $420.00 USD each.

Part Number: DAISYCHAINBOX, module allowing 1 to 16 Model HT-91100 RS232 shakers to be connected to a single PC RS232 or USB communication port. $425.00 USD each.

Part Number: USBSERIALCONVERTER, modular cable for converting a USB port to an RS232 serial communications port. Use in applications where you need to connect a HT-91100 shaker to a PC that only has USB ports available, such as laptops and notebook computers. $42.00 USD each.

Certified for Laboratory Equipment

 Our shakers are RoHS compliant


Bare HT-91100


HEAVYBASE accessory, shown with shaker.



What's In The Box

Box size: 9.5" x 8.0" x 3.25" (241mm x 203mm x 82.5mm).
Box weight: 2.5 lbs. (1.134kg).
One each Model HT-91100 Orbital Shaker
One each 6 foot RJ-11 4-pin telephone cable, straight-through configured
One each RJ-11 to 9-pin D-type serial cable connector module
One each 100-240 VAC 50/60Hz power adapter, 24 VDC 1.5 A output, CE approval, US plug 6 foot cord
Paper copy of the Burn-In, Test and Certification
One each FlashDrive with PC Windows App to control and monitor the shaker immediately, also has all product line manuals, interface code, includes all source code in VB6.



Get a HT-91100 brochure in pdf format.
HT-91100 Operations Manual in pdf format.
Shaker mounting drawing (jpg).
3D CAD Layout in zipped IGES format.
3D CAD Layout in zipped STEP format.
3D CAD Layout in zipped SolidWorks2018 format.

For Orbital Shaker inquiries, sales, support or service send email to: or go to our inquiry form

Big Bear Automation

Phone: 510.333.4338
EFax: 925.397.3148

2019 Big Bear Automation