Campbell-scientific CR10X Measurement and Control System Uživatelský manuál stáhnout pdf (Strana 246)

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

1 2 ... 241 242 243 244 245 246 247 248 249 250 251 ... 361 362

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