Rockwell Automation 1747-KE,D17476.12 DH-485/RS-232C Interface Module - Manual (Page 35)

Publication 1747-UM005B-EN-P - March 2006
Communicate with the Interface Module 3-9
Slave-to-slave Communication
The interface module lets communication from a DH-485 network
device to a single DF1 slave device, regardless of which mode of
half-duplex addressing is selected (local or remote). To achieve this,
the interface module’s Master Station Address must be configured as
that DF1 slave address.
For example, if the RSLinx terminal in the illustration below is DF1
node 3, the interface module’s Master Station Address must be
configured as node 3.
Slave-to-slave Communication
In this illustration, a packet from the RSLinx computer, intended for an
SLC node, is first transferred to the PLC-5 controller (DF1 master). The
PLC-5 controller then transfers the packet to the interface module,
which converts it to a DH-485 packet and sends it to the specified SLC
node. The SLC node’s response goes through the interface module to
the PLC-5 controller. The PLC-5 controller then transfers the response
to the RSLinx computer.
The operation of slave-to-slave communication differs slightly
depending on whether the interface module is in local or remote
mode.
DF1 Slave Interface Module
(1747-KE)
Link Coupler
(1747-AIC)
PLC-5
processor
(DF1 Master)
(DF1 Slave)
Dedicated Line
Modem
Dedicated Line
Modem
Dedicated Line
Modem
Link Coupler
(1747-AIC)
Link Coupler
(1747-AIC)