Rockwell Automation 1771-DB BASIC MODULE User Manual
Page 299
Chapter
Call Routines 69–127
13
13 -41
Operational Codes for Full-Duplex Mode:
Legal values for the operational code are 16 to 31 for full-duplex mode:
Operational code
Corresponding mode of operation
16
NHS, ER, Disable DPD, BCC Error Checking
17
NHS, ER, Enable DPD, BCC Error Checking
18
NHS, ER, Disable DPD, CRC Error Checking
19
NHS, ER, Enable DPD, CRC Error Checking
20
NHS, ADER, Disable DPD, BCC Error Checking
21
NHS, ADER, Enable DPD, BCC Error Checking
22
NHS, ADER, Disable DPD, CRC Error Checking
23
NHS, ADER, Enable DPD, CRC Error Checking
24
FDM, ER, Disable DPD, BCC Error Checking
25
FDM, ER, Enable DPD, BCC Error Checking
26
FDM, ER, Disable DPD, CRC Error Checking
27
FDM, ER, Enable DPD, CRC Error Checking
28
FDM, ADER, Disable DPD, BCC Error Checking
29
FDM, ADER, Enable DPD, BCC Error Checking
30
FDM, ADER, Disable DPD, CRC Error Checking
31
FDM, ADER, Enable DPD, CRC Error Checking
Important: Select other port parameters, such as communication rate,
number of stop bits, and parity with the MODE command (page 11 -20)
before you enable DF1. The modem handshaking selection made here
overrides the handshaking parameter of the MODE command until DF1 is
disabled.