1. Function Introduction:
4-digit LED tube display screen
Docking port with RCC module
Wire jumper select RCC reception: JJY, MSF, DCF and WWVB
Wire jumper selectwhen RCC is receiving , LED Display ON or OFF.
24-hour format
4 button operations (TIME, RCC, HR, MIN,).
5.0V working voltage
Product size: LCD display: 72mm*26mm
Button battery model: CR1220

2. Key Description：
1).TIME (Time Setting)：
a、Single press to see the second position
b、Press the TIME +HR adjust hours, press TIME +MIN adjust minutes.
c、During the receiving time of RCC, long press TIME key 2 seconds will turn to the normal time display, but it’s still receiving RCC signal.

2).RCC （RCC receive key）：
a、Single press RCC key,receive radio signal and adjust time
b、During receiving RCC and long press 3 seconds can exit receiving.

3).HR (Hour)：
a、Press TIME+HR adjust hour.
b、In DCF format, single press HR key,you can view time zone in the normal display time.
c、In DCF format, long press HR key 2 seconds and turn to time zone setting mode in normal display time. Press MIN key adjust time zone, after the adjustment HOUR key confirmed or no action within 5 seconds will confirm automatically and exit.

4).MIN (Minute)：
a、Press TIME +MIN adjust minutes.
b、In time zone setting mode, single press to adjust time zone.

5. Attention:
1)、The input voltage of DS-879X can’t exceed 5.5V
2)、During the operation time, please don’t touch crystal oscillator with hand to avoid any influence.
3)、Display ON/OFF, the distance between RCC module and MCU module: RCC mode which the display screen is ON has big interference, the distance should >150MM between RCC aerial and MCU; RCC mode which the display screen is OFF has fewer interference, the distance should >50MM between RCC aerial and MCU.