AutomationDirect BX-DM1-36AR

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.

Source checked8/8 values · 2026-10-26

AutomationDirect PLC

Specification

2 sources

Category	plc
Program memory	64,000 words
Data memory	128,000 words
Discrete inputs	20
Discrete outputs	16
Serial ports	1
Supply voltage	120-240 VAC

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.

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).