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5-6-3 Receive data
The RS-485's operation of receiving data is in the same of the RS-232's.
5-6-4 Basic Language Example
a. Initial 86C450 UART
10 OPEN "COM1:9600,m,8,1"AS #1 LEN=1
20 REM Reset DTR
30 OUT &H3FC, (INP(%H3FC) AND &HFA)
40 RETURN
b. Send out one character to COM1
10 REM Enabled transmitter by setting DTR ON
20 OUT &H3FC, (INP(&H3FC) OR &H01)
30 REM Send out one character
40 PRINT #1, OUTCHR$
50 REM Check transmitter holding register and shift register
60 IF ((INP(&H3FD) AND &H60) >0) THEN 60
70 REM Disabled transmitter by resetting DTR
80 OUT &H3FC, (INP(&H3FC) AND &HEF)
90 RETURN
c. Receive one character from COM1
10 REM Check COM1: receiver buffer
20 IF LOF(1)<256 THEN 70
30 REM Receiver buffer is empty
40 INPSTR$"
50 RETURN
60 REM Read one character from COM1: buffer
70 INPSTR$=INPUT$(1,#1)
80 RETURN
Note 10: The RS-485 of the JetBox uses COM1. If you want to program it and
hardware setup, please refer to the BIOS Setup for COM1 address setup and the
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Software Installation | Korenix
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