User`s guide

Page 12

Controlinc 1746-C (Version 5.21) Network Master Users Guide (2004-11-18)

A typical E>Net network connection format is in a ring …

• It starts from Port 1 (PRT1) (the top DB9 connector) on the 1746-C as RS232 and connects to

the NIU at the port labeled “Host A”.

• It exits the NIU at the port labeled “Port A” as an RS485 circuit and proceeds to the first valve

actuator, normally addressed as #1, in port A.

• It exits the actuator from Port B and proceeds to the port A next actuator (address #2) and on

until the last actuator on the network is connected.

• The RS485 network then exits port B on the last actuator returns to the NIU at the port labeled

“Port B”.

• The network connection is then transformed back to an RS232 format and exits the NIU via the

port labeled “Host B”

• It connects to the 1746-C via port2 (PRT2) (the bottom DB9 connector).