#define MAX_MSG_LEN 16   // may be increased if necessary to max 251
#define DEBUG 1

static const hm2_modbus_chan_descriptor_t channels[] = {
/*  {TYPE,     FUNC, ADDR,   COUNT, pin_name} */
    {HAL_U32,   3,   0x3003, 1,     "voltage"},
    {HAL_U32,   3,   0x3004, 1,     "current"},
    {HAL_FLOAT, 3,   0x3005, 1,     "speed-rpm"},
    {HAL_U32,   3,   0x5000, 1,     "faultcode"},
    {HAL_U32,   6,   0x2000, 1,     "speed-cmd"},
    {HAL_U32,   6,   0x1000, 1,     "motor-cmd"}
};