Rockwell Automation Publication 1766-UM001O-EN-P - September 2021 193
Appendix F MicroLogix 1400 Distributed Network Protocol
For Channel 2, the selections can be No Handshaking, and Half Duplex
Modem (CTS/RTS handshaking).
Default selection is No Handshaking.
When the controller is connected to DNP3 Master using RS-232 line directly,
you must select No Handshaking. If you want to use the Modem line in a half
duplex network, you must select Half Duplex Modem (CTS/RTS handshaking).
If the controller is connected to an RS-485 network and a 1763-NC01 cable is
used, you must select No Handshaking (DH-485 Network).
If you want to send an ASCII string via a serial channel which is configured to
DNP3 Slave protocol, use AWA and AWT instructions to control the Modem.
For Cabling and Connections, see
Communication Connections on page 57.
For AWA and AWT instructions, see MicroLogix 1400 Programmable
Controllers Instruction Set Reference Manual, 1766-RM001
.
Request LL Confirmation
Valid selections are Enabled (Checked) and Disabled (Unchecked). Default
value is Disabled (Unchecked).
When the selection is Disabled (Unchecked), Primary Frames from the
controller are sent out with the function code
FC_UNCONFIRMED_USER_DATA (4).
When the selection is Enabled (Checked), Primary Frames from the controller
are sent out with the function code FC_CONFIRMED_USER_DATA (3). In this
case, the controller waits for the confirmation and may retry the Frame if it did
not receive the confirmation from DNP3 Master within the time Confirmation
Timeout (x1 ms).
Send LL Confirmation
Valid selections are Enabled (Checked) and Disabled (Unchecked). Default
value is Disabled (Unchecked).
When the selection is Disabled (Unchecked), the optional Secondary Frame is
not sent out with the function code FC_NACK (1) or FC_NOT_SUPPORTED (15).
When the selection is Enabled (Checked), the optional Secondary Frame is sent
out with the function code FC_NACK (1) or FC_NOT_SUPPORTED (15).
Confirmation Timeout (x20 ms)
When Request LL Confirmation is enabled, the controller waits to receive a
confirmation frame until this timeout has expired.
The valid range is 1…65535. Default value is 1.
Message Retries
When Confirmation Timeout (x1 ms) has expired and this parameter was non-
zero value, the controller tries to send retry packets.
The valid range is 0…255. Default value is 0.
Pre-transmit Delay (x1 ms)
The controller waits for the specified time before sending the packet.
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