User`s manual
http://www.adtechcn.com 21
) Connection for pulse output signal
1. Differential mode:
This mode is suitable for the stepping driver and most of the server drivers with independent pulse and
direction input. It is recommended this mode is used, for it provides high anti-interference capacity.
Driver of stepping motor
Driver of server motor
2. Single-end mode
This mode was used for the stepping motors, with which the anodes of pulse and direction were connected
together in early time.
Driver of stepping motor
Note: It is not suitable for stepping motors, the cathodes of whose pulse and direction are connected together.
EXTVCC5.0A or EXTVCC5.0B is not used for other purposes except for the non-differential
connection method of the driver’s pulse. Otherwise, the internal circuit of the ADT-8840 might be
damaged. Any two of the four pins, namely, PU+, PU-, DR+ and DR- shall never be connected together.
Otherwise, the internal circuit of the ADT-8840 might be damaged too.