MTS SWIFT 20 Ultra Sensor - Manual (Page 106)

SWIFT 20 Sensors 106
Communication Configurations
Installing the Transducer
Communication Configurations
Important This section includes information related to the Low-Profile
Transducer Interface (TI). For SWIFT transducers designed to
operate with the newer Mini TI, there is a separate manual that
documents the Mini TI (MTS part number 100214316).
Communication between a SWIFT TI and a remote host is based on a master/
slave communications protocol. Each SWIFT TI has a unique address from 01 to
09. The address 00 is reserved for broadcast messages, which go out to all boxes.
To send a message to a particular SWIFT TI, the host must address that particular
SWIFT TI by number.
Note A leading 0 is required in the communications protocol.
A remote host can be connected to a daisy-chain of SWIFT TIs through either an
RS-232 or an RS-485 cable. The host is connected to one controller, which
constitutes one end of the chain. A multidrop RS-485 cable connects the rest of
the chain of controllers. The last controller in the chain requires a termination
jumper plug (MTS part number 510743-01) to terminate the multidrop RS-485
transmit/receive lines for Communications Channel 1.
RS-232 host
The following figure shows an RS-232 host connected to an RS-485 chain of
SWIFT TIs. This configuration allows up to nine SWIFT TIs on the RS-485
multidrop chain.
Host
RS-232
RS-485 Chain
(Up to 9 SWIFT TIs)
Last Controller
Terminated with
Jumper Plug
(MTS p/n 510743-01)
J2 J3 J2 J3 J2 J3 J2 J3
Cable
(MTS p/n 510742-XX)
50 ft
maximum
300 ft
maximum
SWIFT TI
Comm
In
Comm
Out
SWIFT TI
Comm
In
Comm
Out
SWIFT TI
Comm
In
Comm
Out
SWIFT TI
Comm
In
Comm
Out
S50-028