Emerson A5510 Manuel D’Utilisation

5. TWS booted but no client 

or browser can not connect 
to it. 

 

TWS is not 
connected to 
LAN. 

 – LAN cable is damaged 

or not properly plugged 
into the TWS. 

 – LAN cable is not 

connected to LAN1 port 
of the TWS.  

 – No TCP/IP IP, subnet, 

gateway assigned to the 
TWS. 

 – The hub’s uplink mode 

must be enabled at all 
times. 

 
 

 – Make sure the connection between the 

TWS and the  LAN is done properly and 
secured. 

 – Use LAN1 port of the TWS for LAN 

connection. LAN2 port must never be used. 

 – If suspicious of the LAN cable RJ45, use a 

cross-over cable to connetct the TWS with 
the client station. 

– Make sure the TSSP was used to configure 

the TWS TCP/IP settings. After any 
configuration download by the TSSP, make 
sure to re-download the configuration from 
the TWS to make sure that the 
configuration data was uploaded properly 
to the TWS. 

 – Make sure that both the subnet and gateway 

addresses of the TWS and the client 
stations are the same. 

 

 – Strictly follow the connection 

diagram discussed in this 
Installation Manual when 
connecting the TWS. 

– Make sure you have run the TSSP 

first to configure the TWS before 
attempting to connect to it through 
a client station. 

 – If the TWS is installed in an 

existing LAN, make sure you only 
assigned IP, subnet, and gatewary 
addresses to the TWS given to you 
by the LAN administrator. 

 – Make sure the client station is also 

connected to the TWS. 

 – You can use the ping application 

which is a resident DOS utility in 
your client station to verify 
connection to the TWS. 

6. TWS booted but found no 

serial ASCO devices. 

 

Devices 
were not 
properly 
connected to 
the TWS. 

 – Device incorrect wiring. 
 – 72As not functioning.  
 – Break in the line 

somewhere in the daisy-
chained connection. 

 – Damaged TWS 

connectors. 

 – Disabled COM4 

communication. 

 – Devices are not 

configured properly – 
protocol & baud rate. 

 – Damaged TWS COM3 

or COM4 RS485 ports. 

 

 – Check the connection of the daisy-chained 

network of device to the TWS. Serial 
daisy-chained network must be connected 
only to COM3 & activated COM4 of the 
TWS. 

 – Check connection between 72As. 
 – Check TTL connections of devices to the 
72As. 
 – Install a repeater for daisy-chain 

interconnect exceeding 4000 feet.  

 – Install terminating resistor at the last 72A 

node of the daisy-chain network to avoid 
noise and signal loss.  

 – Make sure to call for ASI for assistance 

when symptoms become apparent and 
conditions worsen. 

 – Strictly follow the connection 

diagram discussed in this 
Installation Manual when 
connecting the TWS. 

 – Make sure all the ASCO devices 

are configured properly. 

 – Follow recommeded remedies to 

avoid noise and signal loss on 
networks exceeding required 
distance or installed in extreme 
environments.