Peter M. Groen / libmodbus

Commit 535e696f23d7c0800f9bd4880879b34dfdf205ff

Authored by Stéphane Raimbault
1 parent 51500e93

New definitions for MAX_STATUS and MAX_REGISTERS 

Improve the conformance to the Modbus protocol.
MAX_STATUS: 800 -> 2000
MAX_REGISTERS: 100 -> 125
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Showing 1 changed file with 9 additions and 2 deletions
src/modbus.h
  View file @535e696
... ... @@ -55,8 +55,15 @@ extern "C" {
55 55 */
56 56 #define MAX_MESSAGE_LENGTH 256
57 57  
58   -#define MAX_STATUS 800
59   -#define MAX_REGISTERS 100
  58 +/* Modbus_Application_Protocol_V1_1b.pdf (chapter 6 section 1 page 12)
  59 + * Quantity of Coils (2 bytes): 1 to 2000 (0x7D0)
  60 + */
  61 +#define MAX_STATUS 2000
  62 +
  63 +/* Modbus_Application_Protocol_V1_1b.pdf (chapter 6 section 3 page 15)
  64 + * Quantity of Registers (2 bytes): 1 to 125 (0x7D)
  65 + */
  66 +#define MAX_REGISTERS 125
60 67  
61 68 #define REPORT_SLAVE_ID_LENGTH 75
62 69  
... ...