Campbell CR10X, Operator'S Manual

Page: 246 / 362

APPENDIX B. CONTROL PORT SERIAL I/O INSTRUCTION 15
B-14
B.6.2 EXAMPLE 2: CR10X TO CR10X
COMMUNICATION
The following example shows how data can be
sent between CR10X's. The program for the
CR10X sending the data, CR10X#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
CR10X#2. Instruction 15 in CR10X#2 receives
and stores the values in Input Locations 11
through 20.
As shown in Figure 2, the RTS/DTR from #1 is
connected to control port 8 of CR10X#2.
RS-232 logic is used so RTS/DTR is +5V when
asserted. The RTS/DTR going high is
connected to port 8 of CR10X#2, causing
subroutine 98 to be executed (refer to CR10X
manual, Instruction 85, Section 12). Subroutine
98 contains Instruction 15, programmed to
receive input. CR10X#2's RTS/DTR is
connected to CR10X#1's CTS. When
CR10X#2 executes Instruction 15, the
RTS/DTR going high signals CR10X#1 to send
data.
CR10X#1 CR10X#2
SEND DATA RECEIVE DATA
FUNCTION PORT PORT FUNCTION
RTS/DTR C6 ----------->C8 Interrupt; SBR 98
CTS C7<----------- C6 RTS/DTR
TX C8 ----------->C7 RX
FIGURE B-2. Wiring Diagram for CR10X to CR10X Communication Example
CR10X#1 PROGRAM - SEND DATA
* 1 Table 1 Programs
01: 5 Sec. Execution Interval
01: P87 Beginning of Loop Start loop to generate values
01: 0 Delay
02: 10 Loop Count
02: P32 Z=Z+1
01: 11 Z Loc [:COUNTER ]
03: P31 Z=X
01: 11 X Loc COUNTER
02: 1-- Z Loc [:VALUE #1 ]
04: P95 End End Loop to generate values
05: P15 Control Port Serial I/O
01: 1 Repetitions
02: 1 Configuration code RS-232, 1200 bd
03: 0 CTS/Delay before send
04: 6 C6 RTS/DTR TX = C8 (code could be = 86)
05: 1 Output start location
06: 10-- Number of locations to send Start at Loc 10 and (--) convert
07: 0 Input termination character
08: 0 Max characters to receive
09: 100 Delay for CTS/input wait 1 sec for CTS to go high
10: 28 First input location If 1 sec delay expires
before CTS goes high,
store -99999 in Loc 28