JOERGER ENTERPRISES, INC. MODEL SMC-R contains two independent stepping motor controllers and drivers packaged in a single width CAMAC module. The drivers are optically isolated, internally biased and can switch up to two amps at 28 volts. This module has been designed as a complete functional unit. Once the motor resistors are chosen that match the motor voltage and the supply voltage nothing more is required. Even the driver biasing is self-contained so using this module in stepping motor applications is quite simple. The module has a capacity of 15 bits plus direction which is loaded in 2’s complement. An interrupt system is provided to simplify system integration. There is a CW and CCW limit input for each channel and if a limit condition is received that motor will be stopped and if the module is enabled an interrupt will be generated. Once a limit condition is received, commands to drive in that direction will be ignored and a Q=0 response will be returned. The status of the module may be read out on command. This will indicate whether there is a CW or CCW limit for either channel, if either channel is at zero indicating a cycle is complete, whether the drivers are powered and if the module’s drivers are in the enable mode. This last feature is provided to lower the power dissipation in the module. When a channel is not active the driver is powered down. This feature may be removed by an internal jumper, which may be the case if the motor is needed to generate holding torque in the steady state mode.