Network Terminal Installation, Operation, and Maintenance Instructions
P/N 8040375G001
3-1
C
HELIX TECHNOLOGY CORPORATION
-
TI
CRYOGENICS
Section 3 - Installation
Network Configurations
As many as twenty On-Board Cryopumps can be connected to the Network
Terminal. The pumps are networked together using CTI-CRYOGENICS
network cables. Before connecting the pumps together, set the address
switch on each pump so that each pump has its own number from 0-9.
The network cables are run from pump to pump, daisy chained together as
shown in Figure 3-1. The first connection is made to the Pumps 00-09
connector for pumps 00-09 on the rear panel of the Network Terminal. The
pumps need not be connected in sequential numerical order (i.e., you may
connect the pumps as follows: 01, 03, 06, 02, 04, etc.). Pumps numbered
10-19 must be connected to the Pumps 10-19 connector identified in Figure
3-1. The address switches on the pump modules, as shown in Figure 3-2,
shall be set to 00-09 respectively but will be recognized by the Network
Terminal as pumps 10-19 as shown in Figure 3-1.
The total network chain shall not exceed 1,000 feet. This means that the
cable distance from the Network Terminal to the last module could be
connected with three 300 foot cables for a total network chain of 900 feet.
Terminators are required to ensure proper data communication between the
pump modules and the Network Terminal. The last module on the network
chain must have a terminator attached to the unused network connector as
shown in Figure 3-1 for proper placement. Two terminators are supplied
with the unit so that a terminator may be placed at the end of each of the
two network chains.
