Comments

1 files changed, 3 insertions, 1 deletions

diff --git a/src/modbus.h b/src/modbus.h
index 7f80c4c..a3835fa 100644
--- a/src/modbus.h
+++ b/src/modbus.h
@@ -4,15 +4,17 @@
 #include <string.h>
 #include <inttypes.h>
 
+/* Modbus function codes */
 #define read_holding_regs  0x03
 #define read_input_regs    0x04
 #define write_single_reg   0x06
 
+/* Helpful macros */
 #define lowByte(w) ((uint8_t) ((w) & 0xff))
 #define highByte(w) ((uint8_t) ((w) >> 8))
 #define word(h, l) ((h << 8) | l)
 
-/* #define MODBUS_TIMEOUT 50 */
+/* Maximum response buffer size for Modbus nodes */
 #define MAX_BUFSIZE    64
 
 typedef struct {