Multi-Drop Operation - Edwards nEXT 55 Instruction Manual

Object name
Command Parameter
Vent options 2 !864
?864

4.6.5 Multi-drop operation

With multi‑drop mode, a single computer system can communicate with more than one
pump. Each pump must be assigned its own individual address before it can be installed
in a multi‑drop system. The command to assign the multi‑drop address is sent in
standard nEXT message format. Refer to
The message protocol in the multi‑drop mode is different than the protocol given for the
serial messages in the single pump systems. The differences in the multi‑drop message
protocol are:
B8G000880_E
B8G000880_E - Installation
Factory Data type
range setting
0 8 decimal
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Page 56
Comments
Units
Hard vent when < 50%
speed if stop or fail
Controlled vent if > 50%
speed then hard vent if <
50% speed if stop or fail
If stop, hard vent
If fail, hard vent when
< 50% speed
If stop, hard vent
If fail, controlled vent
> 50% speed then hard
vent < 50% speed
If fail, hard vent
If stop, hard vent when
< 50% speed
If fail, hard vent
If stop, controlled vent >
50% speed then hard
vent < 50% speed
Hard vent if stop or fail
Same as option 6
Output is permanently
energised (Fan ON)
Do not use
Output is permanently
de-energised (Fan OFF)
Do not use
Do not use
Do not use
Hard vent when < 50%
speed if stop
Controlled vent if > 50%
speed then hard vent if
< 50% speed if stop.
Assigning a multi-drop address
07/2021 - ©Edwards Limited
on page 68.