[en] Since 2014 PRFN-BATAN has developed a radiation portal monitor. By 2015 the design of the system is done for non spectroscopy portal monitors that require counter module with a data width of 16 bits, which are sufficient for counting large radiation exposure that was detected by a gamma detector. The design of counter module in PMR15 takes 3 counter inputs, in order to carry out the counting at three (3) energy level, that is low, medium and high energy. This combination will be used in an algorithm to determine the rate of false alarms. Counter module uses three (3) programmable microcontrollers connected to each other through the I2C (master-slave). To be able to transmit data over a distance of 100 meters TCP/IP communication is used. From the function test results show that the data of the module counter can be monitored through a browser or other software via TCP/IP communication and be able to respond to the number of counts in accordance with the input data with the average value of the error/correction factor between ± 0.08 % to ± 1.02 %. (author)