Rockwell Automation 1771-DB BASIC MODULE - Manual (Page 307)

Chapter
Call Routines 69–127 13
13 -49
Use CALL 115 to check the DF1 transmit status.
Input and Output Arguments
This routine has no input arguments and one output argument. The output
argument returns a value that represents the DF1 transmit status:
0 = no transmit result pending
1 = transmit result pending
2 = transmission successful
3 = transmission failed
4 = enquiry timeout, no transmission– this status should never be
returned if full-duplex mode is selected
5 = if modem handshaking is selected, either a loss of CTS signal while
transmitting or a fatal transmitter failure has occurred. If no
handshaking is selected, a fatal transmitter failure has occurred
6 = if modem handshaking with constant carrier has been selected for
either half-duplex or full-duplex modes, this error indicates transmission
failure due to modem disconnection (DCD signal loss for more than 10
seconds)
7 = DF1 driver is not enabled
Syntax
CALL 115
POP DF1 transmit status
Example
>1 REM EXAMPLE PROGRAM
>10 CALL 115
>20 POP X
>30 END
CALL 115: Check DF1
Status