B.7.2 example 2: cr23x to cr23x communication – Campbell Scientific CR23X Micrologger User Manual
Page 258
APPENDIX B. CONTROL PORT SERIAL I/O INSTRUCTION 15
B-14
06:
P77
Real Time
01:
110
Day,Hour-Minute
07:
P70
Sample
Output out of range reading
01:
1
Rep
02:
1
Loc AIR, mb
08:
P86
Do
Set Intermediate Processing
01:
19
Set high Flag 9
Disable Flag
09:
P86
Do
Set Flag 1 low
01:
21
Set low Flag 1
10:
P95
End
End of If Flag Then Do
11:
P92
If time is
Output mb twice/day
01:
0
minutes into a
02:
720
minute interval
03:
10
Set high Flag 0 (output)
12:
P77
Real Time
01:
110
Day,Hour-Minute
13:
P71
Average
01:
1
Reps
02:
1
Loc AIR, mb
14:
P
End Table 1
Input Location Labels:
1:AIR, mb
B.7.2 EXAMPLE 2: CR23X TO CR23X
COMMUNICATION
The following example shows how data can be
sent between CR23X's. The program for the
CR23X sending the data, CR23X#1, includes a
loop which creates data to send; the numbers
are generated and stored in Input Locations 1
through 10. Instruction 15 then transfers the
contents of Locations 1 through 10 to
CR23X#2. Instruction 15 in CR23X#2 receives
and stores the values in Input Locations 11
through 20.
As shown in Figure 2, the DTR from #1 is
connected to control port 8 of CR23X#2. RS-
232 logic is used so DTR is +5V when asserted.
The DTR going high is connected to port 8 of
CR23X#2, causing subroutine 98 to be
executed (refer to CR23X manual, Instruction
85, Section 12). Subroutine 98 contains
Instruction 15, programmed to receive input.
CR23X#2's RTS is connected to CR23X#1's
CTS. When CR23X#2 executes Instruction 15,
the RTS going high signals CR23X#1 to send
data.
CR23X#1
CR23X#2
SEND DATA
RECEIVE DATA
FUNCTION PORT PORT FUNCTION
DTR
C1 ----------->C8
Interrupt; SBR 98
CTS
C2<----------- C1
RTS
TX
C5 ----------->C5
RX
FIGURE B-2. Wiring Diagram for CR23X to CR23X Communication Example