TMCM-1260 Hardware Manual • Hardware Version V1.10 | Document Revision V1.20 • 2018-05-17
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3 Mechanical and Electrical Interfacing
3.1 Size of board
The board with the controller/driver electronics has an overall size of 60mm x 60mm x 26mm without
mating connectors. Maximum component height without mating connectors is around 21mm above and
3mm below PCB level. There are four mounting holes for M3 screws for mounting the board either to a
NEMA23 (two mounting holes at opposite corners) or a NEMA24 (other two mounting holes at opposite
corners) stepper motor.
Power
1
4
4
RS485 + CAN
USB
Motor
1
4
1
I/O
1
8
1
4
(0/0)
(3.25/13.75)
3.2
(4.6/45.95)
3.2
(56.75/46.25)
3.2
(55.4/14.05)
3.2
(26/58.25)
(3.75/24.05)
(33.75/1.65)
(35.95/8.5)
(58.25/37)
Figure 1: Board dimensions, position of mounting holes and position (pin 1) of connectors (all values in mm)
3.2 Board mounting considerations
The TMCM-1260offers four metal plated mounting holes. All mounting holes are connected to system and
signal ground (same as power supply ground). In order to minimize distortion of signals and radiation of
HF signals (improve EMC compatibility) especially in sensitive / noisy environments it is important to ensure
a solid ground connection within the system. In order to support this, it is recommended to connect
mounting holes used for mounting the board to the supply ground connection (in addition to the ground
connection of the power supply connector). Nevertheless, this might not always be an option e.g. in
case the metal system chassis / TMCM-1260mounting plate is already connected to earth and a direct
connection between supply ground (secondary side) and mains supply earth (primary side) is not desired /
not an option. In this case plastic (e.g. made of nylon) spacers / distance bolts and screws should be used.
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