Specifications

27
1768-SG001A-EN-P -- March 2006
CompactLogix Selection Guide
SSeerriiaall NNeettwwoorrkk
The serial port is compatible with RS-232 serial communication. The serial port supports
the DF1 protocol to communicate with other devices on the serial link. You can select:
UUssee TThhiiss DDFF11 MMooddee FFoorr
Point to point Communication between a controller and other DF1-compatible devices using DF1 full-duplex protocol
DF1 master
Control of polling and message transmission between the master and each slave using DF1 half-
duplex polled protocol
DF1 slave Using the controller as a slave station in a master/slave serial network using DF1 half-duplex protocol
User mode (ASCII) Communication between a controller and an ASCII device, such as a bar code reader
The serial port is Channel 0 and is fully isolated. The serial channel supports DF1, DH-
485, and ASCII protocols.
11776699--AASSCCIIII SSeerriiaall GGaatteewwaayy MMoodduullee
The 1769-ASCII module, a general purpose two-channel ASCII interface, provides a
flexible network interface to a wide variety of RS-232, RS-485, and RS-422 ASCII devices.
The module provides the communication connections to the ASCII device.
CCaatt..
NNoo..
1769-ASCII
CChhaannnneell
CCoonnffiigguurraattiioonn
RS-232, RS-422, or RS-485
MMeessssaaggee LLeennggtthh,, MMaaxx.. BBaacckkppllaannee CCuurrrreenntt ((mmAA)) aatt 55VV PPoowweerr SSuuppppllyy DDiissttaannccee RRaattiinngg
200 characters 500 mA
4 modules
TTyyppiiccaall SSeerriiaall CCoonnffiigguurraattiioonn
MMooddbbuuss SSuuppppoorrtt
To use Logix5000 controllers on Modbus, you connect through the serial port and execute
a specific ladder logic routine. The controller project is available with RSLogix 5000
Enterprise programming software. For more information, see Using Logix5000 Controllers
as Masters or Slaves on Modbus Application Solution, publication CIG-AP129.