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Functions of the '485 Data Pair Connections
T+
Differential
T-
Transmitter Data
R+
Differential
R-
Receive Data
Example – Accelaterm Ethernet to '485 Repeater Network
= 01
ADDRESS
*
ADDRESS
Ethernet and '485
'485 Repeater
Interfaces Installed.
Interface Installed.
[
]
Bridge
STD
Bridge
T+
R+
T-
R-
Bridge
R+
T+
OUT
R-
T-
Host
UL497B
Computer
Surge
or Server
Arrestor
Bridge
3KV
UL294A compliant installation requires UL497B-Listed Surge arrestors be installed on all data lines connected to Computer Ac-
cessory Equipment. On the downstream side, Ground Loop currents are limited by the low-capacitance, high-voltage disc capaci-
tor. This connection assures compatibility with nearby Radio-Frequency equipment.
"Ethernet Only" installations may use third-party isolated USB to 485 Convertors connected to the Upstream side of the first Ac-
celaterm panel. Contact Continental Tech Support for latest data.
*Note: Address of the Accelaterm are not required to be consecutive, only that the Bridge Accelaterm be first.
= 02
*
ADDRESS
'485 Repeater
Interface Installed.
[
]
STD
Bridge
STD
IN
T+
R+
T-
R-
STD
R+
T+
OUT
R-
T-
T+
T-
R+
R-
_
_
T+
T-
Out
R+
R-
Figure 19 - Accelaterm Ethernet to '485 Repeater Network
Note: A (+) is always connected to a (+), and a (-) always to a
(-). A Transmitter is always connected to a Receiver. Up-
stream cables head toward the Server; downstream cables head
away from the Server.
= 03
*
ADDRESS
'485 Repeater
Interface Installed.
[
]
STD
Bridge
STD
IN
T+
R+
T-
R-
STD
STD
R+
T+
IN
OUT
R-
T-
T+
T-
STD
R+
Out
R-
_
_
T+
T-
STD
In
R+
R-
Drain Wire connected to
Cabinet Ground Post
27
COMMUNICATION CONNECTIONS
= 04
= 05
*
ADDRESS
'485 Repeater
Interface Installed.
[
]
[
STD
Bridge
T+
R+
T-
R-
STD
STD
R+
T+
OUT
IN
R-
T-
If last unit, Downstream
Connections
left open.
®
Accelaterm
Installation and Service Manual
*
]
STD
T+
T-
STD
R+
Out
R-
_
_
T+
T-
STD
In
R+
R-
Drain Wire connected to
Cabinet Ground Post
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