Specifications

Publication 1747-SG001E-EN-E - February 2013
Select Network Communications 65
In system mode, the serial port also supports supervisory control and data acquisition
(SCADA) applications. SCADA systems allow you to monitor and control remote
functions and processes using serial communication links between master and slave
locations.
When configured for user mode, the serial port supports ASCII devices. Use the SLC
500 ASCII instructions to send information to and receive information from these
devices.
RS-232/DF1 Port Splitters
The 1747 Port Splitters let a single RS-232/DF1 full-duplex communication port on a
controller split into two separate ports for simultaneous connection with two external
devices. The Port Splitter supports the following: SLC 500, PLC-5, MicroLogix,
ControlLogix, CompactLogix, and FlexLogix controllers.
The Port Splitter has three ports for Controller, Network and Programmer/HMI
connections. It also has a connection for a +24V external power source and status LEDs.
• The Controller port connects to the RS-232/DF1 full-duplex port of a controller.
The port configuration is set at DF1 full-duplex, 8 bits, no parity, 1 stop bit and
CRC checksum on powerup. The port automatically sets the baud rate to 19.2 K
or 38.4 K baud taking advantage of the controller's maximum baud rate and can
also match the controller's CRC or BCC checksum.
• The Network port on the 1747-DPS1 connects to a 1761-NET-AIC,
1761-NET-DNI or 1761-NET-ENI module and receives any messages initiated
from the controller. The network port can source power from the port splitter's
external power supply to one of the above modules if a 1761-CBL-AM00 or
1761-CBL-HM02 cable is used.
• The Network port on the 1747-DPS2 provides similar functionality, but can be
configured for communications with DH-485, DF1 half-duplex (master or slave),
DF1 full-duplex, and DF1 radio modem networks. The port is programmed for
DH-485 communication at the factory.
• The 1747-DPS2 port splitter has fully-isolated communication ports. Therefore,
no external isolation is required.
• The Prog/HMI port connects to a programming station or HMI device
(PanelView Standard, PanelView Plus, VersaView CE) for respond only
operations.
The serial configuration for the Network and Programmer/HMI ports on the
1747-DPS1 port splitter must be set to DF1 full-duplex, 8 bits, no parity, 1 stop bit, 19.2
K baud and CRC checksum.
The Network port on the 1747-DPS2 port splitter can be configured forwonderduplex,
and DF1 radio modem networks.