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MC1 V3 Installation & Programming page 7 / 9

If 2 way serial is not used, then several MC1 receivers can all be on one RS232 link. The protocol allows each unit to be

controlled individually as long as the commands are not sent so fast as to overflow the buffer. The “L” command should be

sent to force the MC1 to effectively not talk unless specifically spoken to.

Warning – when an IR command is being sent, serial commands may be lost, and when a serial command is received, an IR

command may be lost. Using the send time of 000 and the “q” command at the same time as a real Bus command may cause

some confusion and you may get unexpected results.

Calibration & Intermediate stops:

If you are changing the motor direction (C6 O2) or Using the “top” reference (C10 O11), these options must be selected

before doing the calibration (C10 O10).

The motor limits must be set before doing the calibration. If the limits are changed, then you must recalibrate.

Calibration is required before intermediate stops will work. If the unit is not calibrated correctly, the intermediate stops will be

different when going open than when going closed. The stops will also be off if the motor does not move at a constant speed

in both directions.

The intermediate stops are calculated based on % of travel time plus nudge offset.

% and nudge can be set before calibration if so desired.

20% = screen mostly down = 20% up from bottom (assuming bottom is reference)

If travel time is unknown (not yet calibrated), all intermediate stop commands are ignored.

If the unit is calibrated and power cycles, and an intermediate stop button is pressed before the unit goes to the reference, then

the command will cause the motor to “auto reset,” i.e., go to the reference limit, then back to the intermediate stop.

Standard action:

There is an auto reset every 6th intermediate stop movement if the motor does not go to either limit. Any user action that

stops the motor part way will cause the next intermediate stop command to auto reset.

High accuracy action with reference at the top:

There is an auto reset if an intermediate stop command is received that will cause the motor to go up, or if the motor has

gone up anytime since being at the top.

High accuracy action with reference at the bottom:

There is an auto reset if an intermediate stop command is received that will cause the motor to go down, or if the motor has

gone down anytime since being at the bottom.

When the unit finishes calibration, the run time is automatically set to 1.5 seconds longer than the travel time. If the Minimum

load threshold was 0 prior to starting calibration, it will be set to an appropriate value (see the next section).

Load Sensing:

In V3 the factory default minimum load threshold is 0. This means limits may be set easily. If calibration starts, and the

minimum load threshold is still 0, then the threshold will automatically be set to 0.144 Amp (17 Watts) for 115VAC units or

0.047 Amp (11 Watts) for 230VAC units. This allows you to set the minimum load threshold and not have calibration “mess

it up.” If calibration does not complete successfully, the minimum load will

not be set back to 0.

If load sensing is not working correctly, you will not be able to calibrate, and intermediate stops will not work. If the motor

stalls at one end of travel, and stall sensing is not tuned well, then the intermediate stops may not be very repeatable.

While the motor is moving, the current is measured to determine if the load has exceeded the stall threshold or if the load has

fallen below the minimum load threshold. These thresholds may be nudged in small increments or directly set. C18 Ox Oy is

used to set the minimum load and C19 Ox Oy to set the stall threshold. When entering Ox, the command will be ignored if O5

- O9 is entered as that is beyond the range of the unit. Oy does not need to be pressed if it is 0 (O10). Extra digits are ignored

after Oy is entered.

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