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Page 11 of 12
AMG3788ERN-DR-1550-HP
Instruction Sheet D16678-00
Management Port Pinout
Pin Number
RS232 Connection
RS485 Connection
1
-
Data B (-)
2
RD (data out of
port)
Data A (+)
3
TD (data into port)
-
4
Connect to DTR
held –ve or short to
ground
-
5
SG (signal ground)
SG (signal Ground)
6
Alarm Output
Alarm Output
7
Alarm Output
Alarm Output
8
Alarm reset (Gnd)
Alarm reset (Gnd)
9
Alarm reset
Alarm reset
For multiple Management Ports it is recommended that the RS485 interface is used with each RS485 pair
connected in parallel. In this case a RS485 to RS232 converter is required in order to connect to a normal
PC Comm Port.
The time delay between receiving a data request and sending out a response from the port is 625us.
Therefore any RS232 or R S485 converter should have a ‘turn around’ time or ‘transmit dwell’ time equal to
or less than 625us.
A suitable converter is the
Dataforth DCP485-S
(Available in the UK Farnell, Pt. No 300-9348)
On
DCP485-S
RS485 Switch Settings:
1-UP, 2-DOWN, 3-DOWN, 4-UP, 5-DOWN, 6-DOWN, 7-DOWN, 8-UP
RS232 Switch Settings
1-DOWN, 2-UP, 3-DOWN, 4-UP
DCE/DTE set to DCE.
Connections to management port:
DCP485-S
Management Port
1
N/C
2
1
3
2
4
1
5
2
NOTE: on the DCP485-S pin 5 and pin 3 are connected together and pin4 and pin 2 connected together.
Alarm Output and Reset Operation
The alarm output and reset is designed to indicate a change of state of the fibre loop or spur attached to the
receiver. The Alarm output is a volts free contact relay output (rating: 0.5amp at 125VAC or 1amp at
24VDC). It normally open, which means that when not powered the contacts will be open circuit. On power
up the contacts will close and will remain closed for up to 5 seconds. During this time the receiver will
monitor and record the state of the 3700 units connected to the receiver. The contacts will then remain
closed until there is a change from this recorded state. A change of state would be:
1.
addition or loss of video at any insert node
2.
addition or loss of primary optical input at any node
3.
addition or loss of secondary optical input at any node
4.
power up or down of any node
5.
loss of power at the receiver
