Multiple Concentrator Network
MS-5000 Multidrop Concentrator User’s Manual
2-11
2-
M
u
lt
idr
op Com
m
.
Select Commands to a Lower Level Multidrop Concentrator
. Com-
mands to lower level concentrators in multiple concentrator networks (such
as Concentrator 01 or 02 in figure 2-5) include both the concentrator’s
address and a 51. For example, to send <Ke1> (Postamble Enable) to Con-
centrator 02, the host transmits 0251<Ke1>CR in the first sequence. Concen-
trator X strips away the 02, substitutes 1F as the select address, and
forwards the remaining command string to Concentrator 02 as shown in fig-
ure 2-10.
Figure 2-10 Concentrator to Lower Level Concentrator Select Sequence
Host-to-Concentrator Polled Network
If the host application’s software (or a
programmable logic controller (PLC))
can mimic a concentrator, the MS-
5000 concentrator itself can be config-
ured in Multidrop (or User Defined
Multidrop) and assigned an address.
(See figure 2-11.)
This type of network uses an RS-485
(polled) interface between the con-
centrator and the host.
Select Command to a Multidrop
Concentrator
. When the host sends
a select command to a concentrator
that’s configured in Multidrop, it trans-
mits the select address (1D hex for
multidrop concentrator address 01 as
shown in figure 2-11). It also prefaces
the command with a 51 just as was
done in figure 2-10.
RES 1F REQ
1F ACK
STX 51<Ke1> ETX LRC
1F ACK
Concentrator 02
RES
Concentrator X
Start of Sequence
End of Sequence
Host
Series
Concentrator
Decoder 02
Decoder 03
Decoder 04
5000
Multidrop ONLY
RS-485 Interface
(LAN)
Figure 2-11 Special Multidrop Network
Polled Protocol
Multidrop or User
Defined Multidrop
RS-485 Interface
01
Summary of Contents for MS-5000
Page 1: ...MS 5000 Multidrop Concentrator User s Manual P N 83 005000 REV J...
Page 8: ...viii MS 5000 Multidrop Concentrator User s Manual...
Page 52: ...Chapter 3 Menu Configuration 3 18 MS 5000 Multidrop Concentrator User s Manual 3 Serial Config...
Page 66: ...Chapter 4 Serial Commands 4 14 MS 5000 Multidrop Concentrator User s Manual 4 Operations...
Page 90: ...A 14 MS 5000 Multidrop Concentrator User s Manual Appendices...
