Rockwell-automation 1771-DB BASIC MODULE Manual de usuario Pagina 296

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Chapter
Call Routines 69–127
13
13 -38
Undefined. If you execute an undefined call, you receive the error
message, “ERROR–UNSUPPORTED
CALL.
Use CALL 108 to enable DF1 driver communications via port PRT2.
You can only enable this device if the operating mode jumper JW4
(page 1 -6) is in the correct position.
See CALL 113 (page13 -47 ) to disable the DF1 driver.
Input and Output Arguments
This routine has six input arguments and no output arguments.
Argument Description Page
input 1
specifies the operational code selection that indicates
the mode of operation for the DF1 driver
13 -38
input 2 specifies the Poll Time-out period when in half-duplex
mode or the ACKnowledge Time-out period when in
full-duplex mode
13 -42
input 3 number of message retries when in half-duplex mode
or the number of ENQuiry Retries to perform when in
full-duplex mode
13 -43
input 4 RTS On Delay time period when in half-duplex mode or
the number of NAK Received Retries to perform when
in full-duplex mode
13 -43
input 5 RTS Off Delay time period 13 -43
input 6 BASIC module address that the DF1 driver responds to
when receiving enquires from a remote DF1 device
13 -43
Input Argument One
The first input argument specifies the operational code selection that
indicates the mode of operation for the DF1 driver.
The operational code specifies the following DF1 parameters:
full-duplex or half-duplex slave operation
duplicate packet detection (DPD) selection
BCC or CRC error checking selection
enable embedded responses (ER) or auto-detect embedded responses
(ADER) (Ex. perform embedded responses only if embedded responses
received form other station. Only applies to full-duplex operation).
modem handshaking selection
CALL
106 – 107
CALL 108: Enable DF1
Driver Communications
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