DF1 Serial Port Expander Gateway


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The ProLinx DF1 Serial Port Expander Gateway allows you to attach up to three separate DF1 master devices to a single DF1 slave.

The module is designed to act as a multiplexer, allowing simultaneous connections from multiple DF1 masters to a single DF1 slave. A common use for the module is to have an HMI panel, SCADA software, and Programming software all communicating to the same DF1 channel 0 port of the Rockwell Automation processor.

The module provides a single DF1 Master port and three DF1 Slave ports.

Caractéristiques Avantages


The Serial Port Expander adds three additional slave ports for a DF1 based device. This allows users to connect programming software, HMI, and modems to processors simultaneously. Commands from the host devices are passed through the module and routed directly to the front port of the processor. This allows a processor's port to be expanded to allow communication with a variety of devices at the same time. Typical applications include local ladder configuration, local operator interface, and wireless concentrator for remote programming and data collection.


DF1 Master/Slave

The DF1 Master/Slave Protocol driver provides extensive support for both Master and Slave implementations of the protocol. The serial port on the gateway is user-configurable to support the DF1 protocol (Master or Slave, Error Checking, Baud rate, etc).

General Parameters



Local Station ID: 0 to 254
Ports 1 to 3 Baud Rate: 110 to 115K baud
Stop Bits: 1
Data Size: 8 bits
Parity: None, Even, Odd

RTS Timing delays: 0 to 65535 ms

Error Checking



Full hardware handshaking control,
providing radio, smart modem and
Multi-drop support
Floating point data supported


DF1 Master Protocol Specifications

The ports on the module can be individually configured as Master ports. When configured in master mode, the DFCM module is capable of reading and writing data to remote DF1 devices.

DF1 Master Driver


DF1 Modes

Full-Duplex – Master (Module generates commands)
Half-Duplex – Polling

Command List

Up to 100 commands per Master port, each fully-configurable for function, slave address, register to/from addressing and word/bit count

Polling of Command List

User-configurable polling of commands, including disabled, continuous, and on change of data (write only)


DF1 Slave Protocol Specifications

The ports on the module can be individually configured to support the Slave mode of the DF1 protocol. When in slave mode, the module can accept DF1 commands from a master to read/write data stored in the module's internal registers.

DF1 Slave Driver


DF1 Modes

Full Duplex – Slave (not peer mode)
Half Duplex – Polled

Configurable parameters per slave port


Data Table File Start (File N[x] 0 to 999)
Data Table File Size (1 to 1000 words)
Data Table location in database (0 to 3999)




Power Supply

24 VDC nominal
18 to 32 VDC allowed
Positive, Negative, GND Terminals
2.5 mm screwdriver blade

Current Load

500 mA max @ 32 VDC max

Operating Temperature

-4° F to 122° F (-20° C to 50° C)

Storage Temperature

-40° F to 185° F (-40° C to 85° C)

Relative Humidity

5% to 95% (with no condensation )


 5.20 in H x 2.07 in W x 4.52 in D (13.2 cm x 5.25 cm x 11.48 cm)
 5.20 in H x 2.73 in W x 4.52 in D
(13.2 cm x 6.934 cm x 11.48 cm)

LED Indicators

Power and Module Status
Application Status
Serial Port Activity
Serial Port Error Status

Configuration Serial Port

DB-9M RS-232 only
No hardware handshaking

Ethernet Port (Ethernet modules only)

10Base-T half duplex RJ45 Connector
Link and Activity LED indicators
Electrical Isolation 1500 V RMS at 50 Hz to 60 Hz for 60 s, applied as specified in section 5.3.2 of IEC 60950: 1991
Ethernet Broadcast Storm Resiliency = less than or equal to 5000 [ARP] frames-per-second and less than or equal to 5 minutes duration

Application Ports

Modbus Plus Connector
Two DB9 Female Standard Modbus Plus connectors

Serial Port Isolation

2500 V RMS port signal isolation per UL 1577
3000 VDC min. port to ground and port to logic power isolation

Shipped with Each Unit

Mini-DIN to DB-9M serial cables
4 ft RS-232 configuration cable
2.5mm screwdriver
CD (docs and Configuration utility)
RS-422/485 DB-9 to Screw Terminal Adaptor (1 or 4, depending on ports)


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