Справочное Руководство для Intermec nx
RS-232—Output to host system
MB/NX/RM/00/E/970131
137
RTS/CTS management
RTS/CTS not active
Low RTS Idle: The MicroBar NX maintains the low level on the RTS pin.
High RTS Idle: The MicroBar NX maintains the high level on the RTS pin.
RTS/CTS active
Low RTS Idle: The MicroBar NX applies the normal RTS/CTS protocol.
High RTS Idle: The MicroBar NX reverses the levels (but not the data) of the RTS/CTS
protocol—high becomes low and low becomes high.
Low RTS Idle (*)
High RTS Idle
LRC (Longitudinal Redundancy Check)
LRC calculates the exclusive OR of each character (hexadecimal value) in the data. The
result is converted into two bytes which are transmitted after all the other characters.
result is converted into two bytes which are transmitted after all the other characters.
Example
If the resulting sum is 4Ah, the two bytes sent are 34h (representing 4) and 41h
(representing A):
(representing A):
LRC = 4Ah -> LRC1 = 34h, LRC2 = 41h
Not Active (*)
Active