User's Manual

Preliminary
AMS-1070 CONTROLLER INSTALLATION GUIDE (8200-0127-06, REV. 0)
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Connecting a Modem to an
RS-485 Network
Figure 14 shows a service laptop connected to an
RS-485 network of controllers. When a modem is
connected to the network, a service laptop can
dial-up and connect to the controllers for remote
service. The following hardware is required:
• External modem – you must flash the modem
and set the dip switches before using
• DB25 male to DB9 male adapter
• Null modem adapter
• RS-232/RS-485 converter
Figure 14. Connecting a modem to a RS-485
network
Sync
Service
Network
A
MS-1070
Controller
232/485
Converter
Sync
Service
Network
A
MS-1070
Controller
Sync
Service
Network
A
MS-1070
Controller
RS232 Modem
Service Laptop
Ethernet
Modem
TO LINE
DB25
1. Plug the RS-232/RS-485 converter into the
DB25/DB9 adapter.
2. Plug the DB25/DB9 adapter into the DB25
connector on the modem.
3. Connect the telephone line to the TO LINE
port of the modem.
Specifications
For the electrical specifications, see Figure 15. For
the mechanical (i.e. size and weight) and
environmental specifications, see Figure 16.
DB25 male to DB9
male adapter
Null modem adapter
T adapte
r
Modem
RS232/RS485
converter