LockMaster LM138 - Universal External Receiver Wire Connection Instruction Manual; Connection to Door Openers with Aux 12-24 VDC Output; CRAFTSMAN Garage Door Opener Connection Example

UNIVERSAL EXTERNAL RECEIVER WIRE
CONNECTION INSTRUCTION MANUAL
1. Connect the external receiver to the door opener if it is with Aux. 12—24VDC
output.
e.g. Connect the external receiver to CRAFTSMAN garage door opener.
(a). Connect the black wire into “NEC” terminal.
(b). Connect the brown wire into “CL2” terminal.
(c). Connect the red wire into “24V” terminal.