Multifunction Pulse Meter  High-speed up-down count pulse measurement/rotational pulse measurement/time interval measurement  Optical isolation communication interface RS-232C, MODBUS RTU protocol, baud rate range 2400 ~ 38400bps    Display: 6-digit LED, red, character height 20.3mm (0.8 inches)  Display range: -199999 to 999999    Sensor power supply: DC5V 130mA (GW631-1-05-11-1-2)                       DC12V 60mA (GW631-1-12-11-1-2)                       DC24V 30mA (GW631-1-24-11-1-2)    Alarm output: relay  Power: 100-240VAC 50/60Hz  Dimensions: 160x80x80mm  Panel cutout size: 152x76mm    The matching sensor is NPN type, if you need to use PNP type sensor, please contact for customization.    Features  18 measurement functions to support various pulse measurement applications  Can be matched with various sensors such as no-voltage contacts, photoelectric switches, proximity switches, encoders, etc.  Counting speed 0～30Hz/0～3kHz/0～100kHz  Frequency (speed) measurement range is as wide as 0.0001Hz ~ 100kHz  It has the function of holding the maximum value and the minimum value, and can be remembered when the power is turned off.  Measured value display update cycle, display brightness can be set  2 groups of alarm output, alarm type, action hysteresis, turn-on delay, turn-off delay can be set