# AutomationDirect BX-DM1-36AR

Hardware · `BX-DM1-36AR` · verification: source checked

The BX-DM1-36AR is a BRX Do-more stackable micro-brick programmable logic controller from AutomationDirect. It runs on 120-240 VAC external power and provides 20 AC discrete inputs and 16 relay discrete outputs, with a serial RS-232/RS-485 port, battery-backed retentive memory and a microSD card slot. It is programmed in ladder with Do-more Designer software v2.0 or later and accepts up to eight expansion modules.

## Specification

| Property | Value |
|---|---|
| Category | plc |
| Program memory | 64000 words |
| Data memory | 128000 words |
| Discrete inputs | 20 |
| Discrete outputs | 16 |
| 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 number E185989; CE declaration available; RoHS status Yes.
- No UL Recognized file, no UL Hazardous file and no CSA file are listed.
- Ships with a button-cell lithium battery installed: UN3091, packaging instruction 970, lithium content 0.07; replacement battery D0-MC-BAT (generic CR2032).

## Study notes

- Memory is stated as 192k words total: 64k words ladder memory and 128k words user data memory.
- Serial port is RS-232/RS-485 on a 3-pin terminal, with speeds up to 115.2k baud.
- Port protocols listed: Do-more protocol, Modbus RTU master/slave, ASCII in/out, K-sequence slave, non-secure HTTP webserver, and programming/monitoring.
- Discrete inputs are 120-240 VAC, arranged in 5 isolated commons of 4 points each.
- Discrete outputs are Form A (SPST) relays rated 12-48 VDC / 24-240 VAC at 2 A per point, arranged in 4 isolated commons of 4 points each.
- Includes a real-time clock/calendar, retentive memory, battery backup and a microSD card slot.
- Supports up to 8 expansion modules and 100+ PID loops configurable to the memory limit.
- A BX-RTB36 or BX-RTB36-1 terminal block kit or ZIPLink pre-wired cables are required; a BX-RTB03S terminal block and D0-MC-BAT battery are included.
- Item shipping weight is listed as 1.4 lb; country of origin USA.

## Sources

1. [BRX Do-more PLC: 20-pt in, 16-pt out, serial port, (programmable logic controller) (PN# BX-DM1-36AR) | AutomationDirect](https://www.automationdirect.com/adc/shopping/catalog/programmable_controllers/brx_plcs_(stackable_micro_brick)/plcs_-a-_cpus/bx-dm1-36ar) (accessed 2026-10-26)
2. [BX DM1 36AR cutsheet](https://cdn.automationdirect.com/static/specs/cutsheet/BX-DM1-36AR_cutsheet.pdf) (accessed 2026-10-26)

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