BX-DM1/E-10, -18, -36, -M Updated: 08/29/2025
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BRX Series Stackable PLCs

The BRX platform is a versatile stackable Micro PLC system that combines powerful features in a compact, stand-alone footprint. The family consists of four Micro PLC Unit (MPU) form factor combinations are available (3 with built-in I/O) to provide strong system designs that fit application requirements exactly, keeping system costs to a minimum. The BRX platform is designed to be used as a stand-alone PLC or can be expanded using a wide variety of expansion module which easily snap onto the side of any BRX Micro PLC Unit (MPU) creating a sturdy and rugged PLC platform. BRX systems can also be expanded using remote base contollers. Look at the BX-DMIO for a dedicated Do-more RBC

 
BRX Micro PLC Features

Free Programming Software with Simulator   (Do-more Designer), and  there's also a free user manual

Do-more! DM1 Technology - Existing Do-more! projects can port over 100%.

Built-in Ethernet Port - EtherNet/IP, Modbus/TCP, MQTT, HTTP support (select modules), Email, FTP.

Built-in Serial Port - RS232 or RS485 software selectable.

Pluggable Option Module (POM) Slot - Add an additional serial port, USB port, or Ethernet port for additional networking or adding Sparkplug B or OPC/UA protocol support.

Micro-SD Card Slot - Data Logging and File Management capability.

Built-in High Speed I/O - Up to 18 DC inputs and half of the DC outputs.

Built-in Analog I/O - Up to 6 I/O (on select models).

Expansion I/O - Any mix of discrete I/O and analog I/O modules. All BRX PLCs support up to 8 expansion I/O modules (while observing power budget limitations).

External Power Required - 12-24 VDC or 120-240 VAC.

NOTE: BRX CPUs can only be programmed with the new Do-more Designer software. DirectSOFT is not compatible with these CPUs.

9 BRX Pluggable Option Modules (POM) are used to add one additional communication port

Ethernet Port (RJ-45, 1Mbps max.)

Secondary Ethernet Port (RJ-45, for use with DM1E CPUs only)

OPC/UA  Protocol (RJ-45)

Sparkplug B Protocol (RJ-45)

USB-B Port

USB-C Port

RS-232 Port (RJ12 6p6c)

RS-232 Port (3-pin terminal strip)

RS-232 Port w/Flow Control (5-pin terminal strip)

RS-485 Port (3-pin terminal strip)

RS-422 Port (5-pin terminal strip)

 

15 DC I/O expansion modules

4 input modules: 8, 12, 16, 32-pt; 12-24 VDC

1 input module: 8-pt; 3-5 VDC

1 input module: 16-pt; 48 VDC

4 output modules (sourcing): 8, 12, 16, 32-pt; 6-24 VDC

1 output module (sourcing): 8-pt; 3.5-5 VDC

6 output modules (sinking): 8, 12, 16, 32-pt; 6-24 VDC

1 output module (sourcing): 16-pt; 48 VDC

5 combo modules: 8-DC in / 4-DC out, 8-DC in / 8-DC out: 8, 12, 16, 32-pt; 6-24 VDC

1 combo module: 8-DC in / 8-DC out: 3.5-5 VDC

1 combo module: 8-DC in / 8-DC out: 48 VDC

8 AC I/O expansion modules

3 input modules: 8, 12, 16-pt; 12-24 VAC

3 input modules: 8, 12, 16-pt; 120-240 VAC

2 output modules: 8, 12-pt; 120-240 VAC

5 Relay output expansion modules

4 modules: 5, 8, 12, 16-pt; 6-48 VDC/24-240 VAC

2 modules (dry contact): 8,16-pt; 6-48 VDC/24-240 VAC

1 combo module: 4 DC in / 4 relay out

14 Analog I/O expansion modules

2 Universal input modules: 4, 8 Channels

3 Current input modules: 4, 8, or 16 Channels

3 Voltage input modules: 4, 8, or 16 Channels

2 Universal output modules: 4, 8 Channels

2 Current output modules: 4, 8 Channels

2 Voltage output modules: 4, 8 Channels

2 Universal Combination modules: 2 in / 2 Out, 4 In / 4 Out

2 Current Combination modules: 4 In / 2 Out, 2 In / 2 Out

2 Voltage Combination modules: 4 In / 2 Out, 2 In / 2 Out

6 Temperature Input expansion modules:

Universal Temperature input modules: 4, 8 Channels

Thermocouple input modules: 4, 8 Channels

RTD input module: 6 Channels

8 Channel NTC (thermistor) input module

Combination Universal Temperature modules:
        4 Universal Temperature Inputs / 4 Universal Analog Outputs
        4 Universal Temperature Inputs / 4 DC Output (Sinking)
        4 Universal Temperature Inputs / 4 DC Output (Sourcing)
        4 Universal Temperature Inputs / 4 Relay

Thermocouple Combination module: 4 THM In / 4 Current Out

RTD Combination module: 4 RTD In / 4 Current Out

3 Specialty modules:

3 Axis High-Speed I/O

4 Port RS-232/485 Serial I/O (includes terminal blocks)

4 Port RS-232 w/ Flow Control Serial I/O (includes terminal blocks)

4 Port RS-422 Serial I/O (includes terminal blocks)

8-pt Discrete Input Simulator

None of the Expansion I/O modules ship with connectors.
They all require BX-RTBxx, BX-RTBxx-1 or BX-RTBxx-2 terminal block kit or ZIPLink pre-wired cables.

 

  Input Power Built-in Ports                

BX-DM1E-M

 85 - 265  VAC 1 Serial
3-pin
RS232C or RS485

1 Ethernet
RJ-45
10/100Base-T

1 POM Slot for additional USB, Serial or Ethernet ports.

Up to 8 expansion I/O modules

  

BX-DM1E-M-D

 10 - 36 VDC 1 Serial
3-pin
RS232C or RS485

1 Ethernet
RJ-45
10/100Base-T

1 POM Slot for additional USB, Serial or Ethernet ports.

Up to 8 expansion I/O modules

  

 

  Input Power Built-in Ports ED13-D   ED23-D   ER3-D   AR3-D  

BX-DM1E-10

 10 - 36 VDC 1 Serial
3-pin
RS232C or RS485

1 Ethernet
RJ-45
10/100Base-T

1 POM Slot for additional USB, Serial or Ethernet ports.
6 Discrete Inputs
12–24 AC/DC  sink/source
 
4 Discrete Outputs
12-24VDC
sinking

1 Analog Input
current / voltage

 
1 Analog Output
current / voltage

Up to 8 expansion I/O modules

   6 Discrete Inputs
12–24 AC/DC  sink/source
 
4 Discrete Outputs
12-24VDC sourcing

1 Analog Input
current / voltage

 
1 Analog Output
current / voltage

Up to 8 expansion I/O modules

   6 Discrete Inputs
12–24 AC/DC  sink/source
 
4 Discrete Outputs
5–48 VDC
24–240 VAC
Relay

1 Analog Input
current / voltage

 
1 Analog Output
current / voltage

Up to 8 expansion I/O modules

   6 Discrete Inputs
120–240 AC  sink/source
 
4 Discrete Outputs
5–48 VDC
24–240 VAC
Relay

1 Analog Input
current / voltage

 
1 Analog Output
current / voltage

Up to 8 expansion I/O modules

  
  Built-in Ports   ED1-D   ED2-D   ER-D   AR-D

BX-DM1-10

 1 Serial
3-pin
RS232C or RS485

1 POM Slot for additional USB, Serial or Ethernet ports.

  
6 Discrete Inputs
12–24 AC/DC  sink/source
 
4 Discrete Outputs
12-24VDC sinking

Up to 8 expansion I/O modules

   6 Discrete Inputs
12–24 AC/DC  sink/source
 
4 Discrete Outputs
12-24VDC sourcing

Up to 8 expansion I/O modules
 
 6 Discrete Inputs
12–24 AC/DC  sink/source
 
4 Discrete Outputs
5–48 VDC
24–240 VAC
Relay

Up to 8 expansion I/O modules

   6 Discrete Inputs
120–240 AC  sink/source
 
4 Discrete Outputs
5–48 VDC
24–240 VAC
Relay

Up to 8 expansion I/O modules

 

  Input Power Built-in Ports ED13   ED23   ER3   AR3  

BX-DM1E-18

 85 - 265  VAC 1 Serial
3-pin
RS232C or RS485

1 Ethernet
RJ-45
10/100Base-T

1 POM Slot for additional USB, Serial or Ethernet ports.
10 Discrete Inputs
12–24 AC/DC  sink/source
 
8 Discrete Outputs
12-24VDC
sinking

1 Analog Input
current / voltage

 
1 Analog Output
current / voltage

Up to 8 expansion I/O modules

   10 Discrete Inputs
12–24 AC/DC  sink/source
 
8 Discrete Outputs
12-24VDC sourcing

1 Analog Input
current / voltage

 
1 Analog Output
current / voltage

Up to 8 expansion I/O modules

   10 Discrete Inputs
12–24 AC/DC  sink/source
 
8 Discrete Outputs
5–48 VDC
24–240 VAC
Relay

1 Analog Input
current / voltage

 
1 Analog Output
current / voltage

Up to 8 expansion I/O modules

   10 Discrete Inputs
120–240 AC  sink/source
 
8 Discrete Outputs
5–48 VDC
24–240 VAC
Relay

1 Analog Input
current / voltage

 
1 Analog Output
current / voltage

Up to 8 expansion I/O modules

  
  Built-in Ports   ED1   ED2   ER   AR

BX-DM1-18

 1 Serial
3-pin
RS232C or RS485

1 POM Slot for additional USB, Serial or Ethernet ports.

  
10 Discrete Inputs
12–24 AC/DC  sink/source
 
8 Discrete Outputs
12-24VDC
sinking

Up to 8 expansion I/O modules

   10 Discrete Inputs
12–24 AC/DC  sink/source
 
8 Discrete Outputs
12-24VDC sourcing

Up to 8 expansion I/O modules

   10 Discrete Inputs
12–24 AC/DC  sink/source
 
8 Discrete Outputs
5–48 VDC
24–240 VAC
Relay

Up to 8 expansion I/O modules

   10 Discrete Inputs
120–240 AC  sink/source
 
8 Discrete Outputs
5–48 VDC
24–240 VAC
Relay

Up to 8 expansion I/O modules
  Input Power Built-in Ports ED13-D   ED23-D   ER3-D      

BX-DM1E-18

 10 - 36 VDC 1 Serial
3-pin
RS232C or RS485

1 Ethernet
RJ-45
10/100Base-T

1 POM Slot for additional USB, Serial or Ethernet ports.
10 Discrete Inputs
12–24 AC/DC  sink/source
 
8 Discrete Outputs
12-24VDC
sinking

1 Analog Input
current / voltage

 
1 Analog Output
current / voltage

Up to 8 expansion I/O modules

   10 Discrete Inputs
12–24 AC/DC  sink/source
 
8 Discrete Outputs
12-24VDC sourcing

1 Analog Input
current / voltage

 
1 Analog Output
current / voltage

Up to 8 expansion I/O modules

   10 Discrete Inputs
12–24 AC/DC  sink/source
 
8 Discrete Outputs
5–48 VDC
24–240 VAC
Relay

1 Analog Input
current / voltage

 
1 Analog Output
current / voltage

Up to 8 expansion I/O modules

      
  Built-in Ports   ED1-D   ED2-D   ER-D    

BX-DM1-18

 1 Serial
3-pin
RS232C or RS485

1 POM Slot for additional USB, Serial or Ethernet ports.

  
10 Discrete Inputs
12–24 AC/DC  sink/source
 
8 Discrete Outputs
12-24VDC sinking

Up to 8 expansion I/O modules

   10 Discrete Inputs
12–24 AC/DC  sink/source
 
8 Discrete Outputs
12-24VDC sourcing

Up to 8 expansion I/O modules
 
 10 Discrete Inputs
12–24 AC/DC  sink/source
 
8 Discrete Outputs
5–48 VDC
24–240 VAC
Relay

Up to 8 expansion I/O modules

    

 

  Input Power Built-in Ports ED13   ED23   ER3   AR3  

BX-DM1E-36

 85 - 265  VAC 1 Serial
3-pin
RS232C or RS485

1 Ethernet
RJ-45
10/100Base-T

1 POM Slot for additional USB, Serial or Ethernet ports.
20 Discrete Inputs
12–24 AC/DC  sink/source
 
16 Discrete Outputs
12-24VDC
sinking

4 Analog Input
current / voltage

 
2 Analog Output
current / voltage

Up to 8 expansion I/O modules

   20 Discrete Inputs
12–24 AC/DC  sink/source
 
16 Discrete Outputs
12-24VDC sourcing

4 Analog Input
current / voltage

 
2 Analog Output
current / voltage

Up to 8 expansion I/O modules

   20 Discrete Inputs
12–24 AC/DC  sink/source
 
16 Discrete Outputs
5–48 VDC
24–240 VAC
Relay

4 Analog Input
current / voltage

 
2 Analog Output
current / voltage

Up to 8 expansion I/O modules

   20 Discrete Inputs
120–240 AC  sink/source
 
16 Discrete Outputs
5–48 VDC
24–240 VAC
Relay

4 Analog Input
current / voltage

 
2 Analog Output
current / voltage

Up to 8 expansion I/O modules

  
  Built-in Ports   ED1   ED2   ER   AR

BX-DM1-36

 1 Serial
3-pin
RS232C or RS485

1 POM Slot for additional USB, Serial or Ethernet ports.

  
20 Discrete Inputs
12–24 AC/DC  sink/source
 
16 Discrete Outputs
12-24VDC
sinking

Up to 8 expansion I/O modules

   20 Discrete Inputs
12–24 AC/DC  sink/source
 
16 Discrete Outputs
12-24VDC sourcing

Up to 8 expansion I/O modules

   20 Discrete Inputs
12–24 AC/DC  sink/source
 
16 Discrete Outputs
5–48 VDC
24–240 VAC
Relay

Up to 8 expansion I/O modules

   20 Discrete Inputs
120–240 AC  sink/source
 
16 Discrete Outputs
5–48 VDC
24–240 VAC
Relay

Up to 8 expansion I/O modules
  Input Power Built-in Ports ED13-D   ED23-D   ER3-D      

BX-DM1E-36

 10 - 36 VDC 1 Serial
3-pin
RS232C or RS485

1 Ethernet
RJ-45
10/100Base-T

1 POM Slot for additional USB, Serial or Ethernet ports.
20 Discrete Inputs
12–24 AC/DC  sink/source
 
16 Discrete Outputs
12-24VDC
sinking

4 Analog Input
current / voltage

 
2 Analog Output
current / voltage

Up to 8 expansion I/O modules

   20 Discrete Inputs
12–24 AC/DC  sink/source
 
16 Discrete Outputs
12-24VDC sourcing

4 Analog Input
current / voltage

 
2 Analog Output
current / voltage

Up to 8 expansion I/O modules

   20 Discrete Inputs
12–24 AC/DC  sink/source
 
16 Discrete Outputs
5–48 VDC
24–240 VAC
Relay

4 Analog Input
current / voltage

 
2 Analog Output
current / voltage

Up to 8 expansion I/O modules

      
  Built-in Ports   ED1-D   ED2-D   ER-D    

BX-DM1-36

 1 Serial
3-pin
RS232C or RS485

1 POM Slot for additional USB, Serial or Ethernet ports.

  
20 Discrete Inputs
12–24 AC/DC  sink/source
 
16 Discrete Outputs
12-24VDC sinking

Up to 8 expansion I/O modules

   20 Discrete Inputs
12–24 AC/DC  sink/source
 
16 Discrete Outputs
12-24VDC sourcing

Up to 8 expansion I/O modules
 
 20 Discrete Inputs
12–24 AC/DC  sink/source
 
16 Discrete Outputs
5–48 VDC
24–240 VAC
Relay

Up to 8 expansion I/O modules

    
Documentation
The BRX series PLC Hardware User Manual covers the Do-more CPUs, discrete I/O and analog I/O modules.
This manual is available as a Free Download (PDF) or order a hard copy at Automationdirect.com.

 

We have also made the PowerPoint™ slides that we use in our technical support training class available for those who want to see them. Follow this link to the slideshow. You will need a PowerPoint™ Viewer to run the slideshow, you can download a free one from Microsoft here.

 
Firmware
Acquiring and applying firmware updates for any of the Do-more PLCs is managed through Do-more Designer. Use Help -> Check for Updates to download updated firmware file.

BX-DM1 / BX-DM1E -10, -18, -36, -M
Last Update   : 11 February 2026

GA Version    : v1.1.2
File Size     : 3.0Mb

OS Version    : v2.11.3
File Size     : 1.4Mb

View the BX-DM1 / BX-DM1E Revision History