Campbell CH201, Product Manual

Page: 39 / 44

Charge State = CYCLE CHARGING
Charge Source =
DC In 1
Check Battery =
0
7.3.2.2 CRBasic programming
Use the SerialOut() and SerialInRecord() CRBasic instructions to program a data
logger to communicate with the CH201 using RS-232. To separate the numerical values, use
SplitStr()
.
The data logger can decipher the two-character checksum by using the CRBasic instruction
CheckSum() . Set the ChkSumType parameter to 5. A correct checksum will produce a result
of zero. A non-zero result indicates a transmission error(s) occurred.
The normal communication mode is SDI-12. Therefore, when the host first sends RS-232
characters, the first character might be missed. Avoid this by initiating RS-232 communication
with two backspace characters
<BS> (0x08)
as shown in the following example subroutine:
'Subroutine sends two backspace characters to the CH201 to
'wake it up and switch over to RS-232 mode.
Sub
WAKEUP
SerialOut
(COMPRT,CHR(&H08),"",1,3)
SerialOut
(COMPRT,CHR(&H08),"",1,3)
EndSub
Downloadable example programs are available at www.campbellsci.
eu
/downloads/ch201-
program-examples .
7.4 LED indicators
The CH201 has two LED indicators, the CHG (charge) LED and the CK BAT (check battery) LED.
Table 7-7 (p. 30) and Table 7-8 (p. 30) list the conditions and associated colo
u
rs for the CHG
and CK BAT LEDs.
CH201 12V Charging Regulator 29