Set section trace byte.
When hwPosFlagJ0Mode is set to j016ByteMode or j064ByteOrNullMode, this variable takes effect.
When hwPosFlagJ0Mode is set to j016ByteMode, the value of this variable is up to 15 characters trace byte.
When hwPosFlagJ0Mode is set to j064ByteOrNullMode, the value of this variable is up to 64 characters trace byte.