Df1 Full-Duplex Protocol - Allen-Bradley MicroLogix 1100 Instruction Set Reference Manual

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DF1 Full-Duplex
Protocol
DF1 Full-Duplex Configuration Parameters
(All MicroLogix 1100 Controller)
Parameter
Channel
Driver
Baud Rate
Parity
Source ID (Node Address)
Control Line
Error Detection
Embedded Responses
Duplicate Packet (Message) Detect
ACK Timeout (x20 ms)
NAK retries
ENQ retries
Stop Bits
DF1 Full-Duplex protocol provides a point-to-point connection between
two devices. DF1 Full-Duplex protocol combines data transparency
(American National Standards Institute ANSI - X3.28-1976 specification
subcategory D1) and 2-way simultaneous transmission with embedded
responses (subcategory F1).
The MicroLogix controllers support the DF1 Full-Duplex protocol via
RS-232 connection to external devices, such as computers, or other
controllers that support DF1 Full-Duplex.
DF1 is an open protocol. Refer to DF1 Protocol and Command Set
Reference Manual, Allen-Bradley publication 1770-6.5.16, for more
information.
DF1 Full-Duplex Operation
DF1 Full-Duplex protocol (also referred to as DF1 point-to-point protocol)
is useful where RS-232 point-to-point communication is required. This
type of protocol supports simultaneous transmissions between two
devices in both directions. DF1 protocol controls message flow, detects
and signals errors, and retries if errors are detected.
When the system driver is DF1 Full-Duplex, the following parameters can
be changed:
Options
MicroLogix 1100: Channel 0
DF1 Full Duplex
300, 600, 1200, 2400, 4800, 9600, 19.2K, 38.4K
none, even
0 to 254 decimal
no handshaking, Full-Duplex modem
CRC, BCC
auto detect, enabled
enabled, disabled
1 to 65535 counts (20 ms increments)
0 to 255
0 to 255
not a setting, always 1
Protocol Configuration
Programming Software
Default
0
DF1 Full Duplex
19.2K
none
1
no handshaking
CRC
auto detect
enabled
50 counts
3 retries
3 retries
1
Publication 1763-RM001C-EN-P - October 2009
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