Error Codes

The TCF-S focusers communicate with TCF-S Control through an ascii command set as described in the TCF-S Technical Manual.  The TCF-S firmware and protocol display error codes for common problems that might occur at the hardware level.  TCF-S Control will handle most of these errors and display a suitable message, but occasionally you may see one of the error codes below:

• ER=1        Temperature probe not connected or not working.

This is the most common fault and can usually be traced to a missing temperature

probe or faulty wiring. Check the temperature probe connection first. Also check

the Control cable connection at the TCF hand control.

Note:  If using the Remote IN/OUT Keypad (Optec stock #17680) the software will throw an error.  
Though the Remote Keypad is "hot-swappable" it is advised that you Disconnect from TCF-S Control
software before using it.  

SPECIAL NOTE: If the PC serial control cable is inadvertently plugged into the RJ-45 connector of the TCF-S

hand control box (the left-most connector) pins 1 and 8 may be pushed down and fail to

make a proper contact. Pin 1 is the ground pin for the temperature probe.  If this connection fails

intermittently, an ER=1 error code will result.    If you are experiencing intermittent connection
problems, examine the pins of the RJ-45 connector using a good light and magnifier.  Check all the pins

are lined up evenly. If not, use a pair of tweezers to bend pins 1 and 8 upward and  back in line.

• ER=2        New calculated position when unit turned on in AUTO-A or AUTO-B exceeds limits.

Try re-centering the focuser and adjusting the telescope’s coarse focus. This error should never be passed
to the TCF-S Control software.  If it is displayed, check that the slide switches are in the "Manual/PC"

• ER=3        EEPROM failed read/write test on boot up.

Contact Optec if this error condition occurs repeatedly.