diff options
| author | Aditya Naik | 2020-02-12 19:46:57 -0500 |
|---|---|---|
| committer | Aditya Naik | 2020-02-12 19:46:57 -0500 |
| commit | 70c917e4caee129687d18b2788282ff7cd1509e8 (patch) | |
| tree | cdac12d7dac6a4547a30a35e362117b271587a14 | |
| parent | df1563fbea50fbf3bf0f92ae6559dd2d7f2e6b29 (diff) | |
Comments
| -rw-r--r-- | src/modbus.h | 4 |
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 { |