Data Sheet

8 GDC3xxx Motor Controller Datasheet Version 1.2 December 28, 2018

FIGURE 6. Factory Default Pin Assignment

Enabling Analog Commands

For safety reasons, the Analog command mode is disabled by default. To enable the An-

alog mode, use the PC utility and set Analog in Command Priority 2 or 3 (leave Serial as

priority 1). Note that by default the additional securities are enabled and will prevent the

motor from starting unless the potentiometer is centered, or if the voltage is below 0.25V

or above 4.75V. The drawing shows suggested assignment of Pot 1 to ANA1 and Pot 2 to

ANA4. Use the PC utility to enable and assign analog inputs.

USB communication

Use USB only for conﬁguration, monitoring and troubleshooting. USB is not a reliable

communication method when used in a electrically noisy environments and communica-

tion will not always recover after it is lost without unplugging and replugging the connec-

tor, or restarting the controller. Always prefer RS232 communication when interfacing to a

computer. USB and CAN can operate at the same time on the GDC36xx. Plugging USB to

a com puter will not disable the CAN interface.

RS485 Communication

The FBL2360 has a half-duplex RS485 interface. Two signals are present on the 25-pin

DSub connector for connecting to RS485 networks. Connecting these two wires with the

correct polarity is all that is needed to establish a connection. The RS485+ is the positive

signal and RS485- is the inverted signal. Once enabled, the RS485 can be used to commu-

nicate data under the Modbus protocol, or Roboteq’s native serial commands.