"Error: Protected Pin" - M42 P4 S200 gcode RRD Fan extender

Dear all,

kindly asking for help.

I followed this instructable [www.clickoslo.com] to get the RRD Fan extender up and running.

I changed in Configuration_adv.h those two lines and uploaded it to the Mega:
#define CONTROLLERFAN_PIN 5
#define E0_AUTO_FAN_PIN 4

When setting M42 P4 S200 or M42 P5 S200 to test the RRD I am getting this error:

Send: M42 P5 S200
Recv: Error Protected Pin
Changing monitoring state from 'Operational' to 'Error: Protected Pin\x0a'

Is there any need to make a change in pins.h as well to avoid this error?
e.g.
#ifndef CONTROLLERFAN_PIN
#define CONTROLLERFAN_PIN -1 <<<<< setting to 5 ??
#endif


I am using 1.1.0-RCBugFix.

any help appreciated

many thanks

christian

Edited 2 time(s). Last edit at 04/12/2017 03:18AM by behn66.

firmware stops you directly playing with IO pins that are under control of the controller

ie in pins.h

#define SENSITIVE_PINS { 0, 1, \
X_STEP_PIN, X_DIR_PIN, X_ENABLE_PIN, X_MIN_PIN, X_MAX_PIN, \
Y_STEP_PIN, Y_DIR_PIN, Y_ENABLE_PIN, Y_MIN_PIN, Y_MAX_PIN, \
Z_STEP_PIN, Z_DIR_PIN, Z_ENABLE_PIN, Z_MIN_PIN, Z_MAX_PIN, Z_MIN_PROBE_PIN, \
PS_ON_PIN, HEATER_BED_PIN, FAN_PIN, FAN1_PIN, FAN2_PIN, CONTROLLERFAN_PIN, \
_E0_PINS _E1_PINS _E2_PINS _E3_PINS _E4_PINS BED_PINS \
_H0_PINS _H1_PINS _H2_PINS _H3_PINS _H4_PINS \
_X2_PINS _Y2_PINS _Z2_PINS \
X_MS1_PIN, X_MS2_PIN, Y_MS1_PIN, Y_MS2_PIN, Z_MS1_PIN, Z_MS2_PIN \
}

you can remove it from the above list... but it will confuse the controller, thinking fan is on when your turn it off etc...

Edited 1 time(s). Last edit at 04/12/2017 06:06AM by Dust.

Dear Dust,

many thanks for your useful feedback. Finally the RRD is fully working as expected - just as you say the M42 does not work when trying to test it overall.


many thanks

christian