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--- cubloc:connecting_a_backup_battery_to_cb290_cb405:index [2023/04/17 13:26]
COMFILE Technology
+++ cubloc:connecting_a_backup_battery_to_cb290_cb405:index [2023/04/18 11:46] (current)
COMFILE Technology
@@ Line 1: / Line 1: @@
-====== Connecting a Backup Battery to the CB290 / CB405 / CUTOUCH ======
+====== Backup Battery ======
 ===== CB290 / CB405 =====
@@ Line 13: / Line 13: @@
 the case of an emergency.
-{{ :cubloc:connecting_a_backup_battery_to_cb290_cb405:backupbattery.png?500 }}
+{{ :cubloc:connecting_a_backup_battery_to_cb290_cb405:backupbattery.png? }}
 ==== Power Features ====
@@ Line 25: / Line 25: @@
 ==== Additional Information ====
-If a Cubloc module is supplied with power above the recommended voltage,
+If a CUBLOC module is supplied with power above the recommended voltage,
 the device can be destroyed. Also please be careful to avoid electrostatic
 discharge, as it too can destroy the device. Please be aware that P1 is an
@@ Line 32: / Line 32: @@
 SIN, SOUT, and ATN, please do not connect them to anything.
-===== CUTOUCH =====
+===== CT1721C =====
+The CT1721C will maintain data in its volatile memory when powered off by using a backup battery. If backup is not needed, the program should clear the memory at the beginning of the program.
+<code xbasic>
+Const Device = CT1720
+Dim TX1 As Integer, TY1 As Integer
+TY1 = 0       ' Clear only TY1
+</code>
+Use [[cubloc:ramclear:index|RamClear]] to clear all data memory at the start of your program.
+<code xbasic>
+Const Device = CT1720
+Dim TX1 As Integer, TY1 As Integer
+RamClear      ' Clear all RAM, both TX1 and TY2
+</code>
+To add a backup battery to the CT1721C, connect a 3V battery to the "Batt. Backup" terminal on the back, bottom right side of the CT1721C and leave the "JUMPER_SUPERCAP" open.  To use a super capacitor instead of battery, connect the super capacitor to "Batt. Backup" and short the "JUMPER_SUPERCAP" terminal to enable charging while the power is on.
+{{ :cubloc:connecting_a_backup_battery_to_cb290_cb405:cutouch_battery.png }}
+In Ladder Logic, all registers S, M, C, T, and D are retained by the backup battery. Register P is cleared by default when the device is powered on. If you only want to clear parts of a register, rather than all registers, use the following method:
+<code xbasic>
+Const Device = CT1720
+Dim i As Integer
+For i=0 to 32   ' Clear only M0 to M32
+ _M(i) = 0
+Next
+Set Ladder On
+</code>
+[[cubloc:index|CUBLOC - Embedded Controller]]

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