# AutomationDirect BX-DM1-18AR

Hardware · `BX-DM1-18AR` · verification: source checked

The BX-DM1-18AR is a BRX Do-more stackable micro brick programmable logic controller. It provides 10 AC discrete inputs and 8 relay discrete outputs, one RS-232/RS-485 serial port, a microSD card slot and battery-backed retentive memory. It is programmed in ladder with Do-more Designer software version 2.0 or later and accepts up to eight expansion modules.

## Specification

| Property | Value |
|---|---|
| Category | plc |
| Program memory | 64000 words |
| Data memory | 128000 words |
| Discrete inputs | 10 |
| Discrete outputs | 8 |
| Serial ports | 1 |
| Supply voltage | 120-240 VAC |

## Connected

- Manufacturer: [AutomationDirect](https://machineschema.com/manufacturer/automationdirect.md)
- Protocols: [MODBUS RTU](https://machineschema.com/protocol/modbus-rtu.md)

## Safety

- UL Listed, file # E185989; no UL Recognized, UL Hazardous or CSA file number is stated.
- RoHS status: Yes; CE declarations and EU REACH document are referenced.
- A lithium button battery is installed (UN3091, lithium content 0.07, packaging instruction 970); replacement battery D0-MC-BAT, generic CR2032.
- External power requirement is 120-240 VAC.

## Study notes

- Total memory is 192k words, split into 64k words of ladder memory and 128k words of user data memory.
- Serial port is RS-232/RS-485 on a 3-pin terminal, with port speeds up to 115.2k baud.
- Supported port protocols: Do-more protocol, Modbus RTU master/slave, ASCII in/out, K-sequence slave, and a non-secure HTTP webserver for programming and monitoring.
- Real-time clock/calendar, retentive memory and battery backup are all included.
- Up to 8 expansion modules can be added; maximum number of PID loops is 100+ (configurable to memory limit).
- Discrete inputs are 10 points at 120-240 VAC, arranged as 2 isolated commons of 5 points each.
- Discrete outputs are 8 Form A (SPST) relays, arranged as 2 isolated commons of 4 points each, rated 2 A per point; nominal output voltage 12-48 VDC/24-240 VAC.
- Requires a BX-RTB18 or BX-RTB18-1 terminal block kit or ZIPLink pre-wired connection cables.
- Ships with a BX-RTB03S terminal block and a D0-MC-BAT battery.
- Item shipping weight is stated as 0.95 lb; country of origin USA, HS code 8537.10.

## Sources

1. [BRX Do-more PLC: 10-pt in, 8-pt out, serial port, (programmable logic controller) (PN# BX-DM1-18AR) | AutomationDirect](https://www.automationdirect.com/adc/shopping/catalog/programmable_controllers/brx_plcs_(stackable_micro_brick)/plcs_-a-_cpus/bx-dm1-18ar) (accessed 2026-10-26)
2. [BX DM1 18AR cutsheet](https://cdn.automationdirect.com/static/specs/cutsheet/BX-DM1-18AR_cutsheet.pdf) (accessed 2026-10-26)

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