User's Manual

Model CH45
EIA 422 or 485
1-2
Slave:
A Slave is an IED that is passive in a Master/Slave configuration. A Slave's communication is
under the control of the Master, and the slave only responds to specific poll requests from the
Master.
Peer:
Peers are IEDs that have equal status and each may initiate a communication when allowed by
the system software by a time slot, token, etc.
FOC:
Fiber Optic Cable.
Single-mode:
Single-mode fibers generally have diameters of 5µm to 13µm. Because of this small core, only
one axial path for light propagation is available through the fiber. The optics required to drive
single-mode fiber have to be highly focused so that minimum dispersion occurs. Though
requiring more expensive optic emitters, the benefit is that longer transmission distances (~30
km) can be achieved.
Multi-mode:
Multi-mode fibers have core diameters of 50µm and larger. This larger core allows the light rays
to be propagated along several different paths down the fiber. The different paths include an
axial component as well as reflected components. Multi-mode units are economical and
effective for transmission over distances up to 5 km.
Mode Jumpers:
The mode Jumpers enables (ON) or disables (OFF) the repeater function of the Link/Repeater.
HD / FD Jumpers:
These Jumpers adapt the Link/Repeater to accept independent transmit and receive channels
(4 wire normally associated with EIA 422) or a shared transmit/receive channel (2 wire,
generally EIA 485). (Note the HD / FD Jumpers consists of four Jumpers and all must be
set.)
Data Coupling Jumper:
These Jumpers adapt the Link/Repeater for either DC or AC electrical input data coupling. With
AC data coupling, the minimum input data rate is 1200 baud. With DC data coupling there is no
minimum input data rate, but a signal stuck high on the input will lock up a loop, bussed or star
network.
Logic Invert Jumper:
This Jumper adapts the Link/Repeater for connecting to DYMEC-DynaStar Models 5844/5845
and/or RS232 IED’s or to provide for an off quiescent state for the LED’s in a loop when biasing
pulls the inputs to an “on” state.
Biasing Resistor Jumpers:
This jumper allows the Link/Repeater to easily adapt the device input bias resistors to reduce
the loading from 330 Ohms to 10 K Ohms.
Simplex Communication:
Transmit only or receive only communications.
Half Duplex Communication:
Sequential transmit and receive communications.