Rockwell Automation 1771-DB BASIC MODULE - Manual (Page 296)

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