Models 5843, 5844, 5843S and 5844S
RS232 or TTL
1-6
1.2.2 DTE/DCE Switch (Two Position Switch)
The DTE/DCE Switch on the Link/Repeater switches the functions of pins 2 and 3 to accommodate the
IED configuration as DTE or DCE. This is a 2 position switch and both actuators must be set for the
Link/Repeater to work properly.
DTE:
Data Terminal Equipment. By RS-232 standards, equipment designed as DTE transmits data
out of pin 2 on a 9 Pin D-connector and receives data on pin 3.
DCE:
Data Communication Equipment. By RS-232 standards, equipment designed as DCE transmits
data out of pin 3 on a 9 Pin D-connector and receives data on pin 2.
1.2.3
Data Coupling Switch
The Data Coupling switch selects the electrical input conditioning, the AC position selects
capacitively coupled, the DC position is directly coupled.
AC:
AC coupling has a minimum incoming data requirement of 1200 baud due to the capacitive
coupling. This option blocks DC electrical levels should the device connected fail and ‘stick
in a high level’. There is a 35 mS timeout for “stuck” output pins, after this time out the link
returns to LED off state.
DC:
DC coupling allows DC logic levels to be transmitted over the fiber network, care must be
taken to guarantee that when any device stops transmitting packets that the input level
returns to a state that allows the T receptacle (emitter) to turn off. If it does not and the IED
is part of a loop, bussed or star network, the first device to transmit blocks all other devices
on the network from transmitting. *Single-Mode units cannot be DC coupled.
1.2.4 Repeat
Switch
The Repeat Switch enables the repeater function in the “ON” position and disables it in the "OFF"
position.
ON:
The repeater function available in the Link/Repeater is enabled. This function converts the
optical signal received on the R optical port to an electrical signal and delivers this signal to
the appropriate pin of the 9 Pin connector, as well as, re-transmits the signal optically out the
Link/Repeater's T optical port.
OFF:
The repeater function available in the Link/Repeater is disabled. The Link/Repeater
converts the optical signal received on the R optical port to an electrical signal and delivers
this signal to the appropriate pin of the 9 Pin connector, and does not re-transmit the signal
optically out the Link/Repeater's T optical port.
1.2.5
Handshaking Switch 4B:
The Handshaking Switch outputs 5 Vdc on a standard handshaking pin in the “ON” position and
disconnects the pins it in the "OFF" position.
ON:
Pin 6 (Data Set Ready) of the Link/Repeater output 5 Vdc. This signal is used by devices
requiring handshaking signals to indicate the readiness of the connected devices to receive
data.
OFF:
Pin 6 of the Link/Repeater is not connected.
Содержание 5843HRT
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