... timing GPS receiver Tame, holding automatically switch to keep Detailed Product DescriptionGPS Rubidium Clock System tames rubidium clock to the cesium ... or abnormal, the CC81231 is able to intelligently judge, switch to the rubidium clock, offering stable time-frequency base.CC81231 ... 4, XS8 three core plug AirlinesSerial interface, GPS status, system information GPS raw data interface, 1, DB-9 ,9600- ...