IDEC OpenNet series User Manual

26: LONWORKS INTERFACE MODULE
26-22 OPENNET CONTROLLER USER’S MANUAL
Reading Transmit Data from Data Registers in the LONWORKS Interface Module
The following diagram is a typical example of reading transmit data from the data registers in the LONWORKS interface
module.
Application Program Example for Data Read
The following program is an example to substitute transmit data of data register C008h for an 8-bit output network vari-
able (nv_o8). When you modify or create an application program, make sure that the application program includes the fol-
lowing codes in italics.
1. /* Output Network Variables */
2. network output unsigned char nv_o8;
3. /* define */
4. #define GA_BCTL 0xC01A
5. #define GA_FCDR_TX 0xC008
6. #define BCTL_NWR_REQ 0x04
7. #define HIGH 1
8. /* Define IO_4 RUN */
9. IO_4 input bit PI_RUN;
10.
11. when(TRUE){
12. unsigned char *pGA;
13. unsigned char dat;
14. unsigned char tx_dat;
15. while(TRUE){
16. if (io_in(PI_RUN) == HIGH){
17. pGA = (unsigned char *)GA_BCTL; /* Preparation for data read */
18. *pGA |= BCTL_NWR_REQ;
19. dat = *pGA;
20. if (dat & BCTL_NWR_REQ){ /* Preparation for data read complete */
21. pGA = (unsigned char *)GA_FCDR_TX;
22. tx_dat = *pGA; /* Read data from register C008h */
23. pGA = (unsigned char *)GA_BCTL;
24. pGA &= ~BCTL_NWR_REQ; /* End data read */
25. nv_o8 = tx_dat; /* Substitute the value for output network variable (nv_o8) */
26. break;
27. }
28. }
29. }
30. }
NO
YES
Is preparation for data
read complete?
Preparation for data read
Read data
End data read
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IDEC OpenNet series Specifications

General

Brand	IDEC
Model	OpenNet series
Category	Controller
Language	English