1 - 22 Modular LYNX System 12.05.2003
Table 5.6: RS-485 Interface Connections and Settings, Multiple Control Module System
Figure 5.4: RS-485 Interface, Multiple Control Module System
It is also possible to communicate with a controller in the system in single mode by sending it a command (with
address) to clear the party flag and then communicate with it as in single mode (no line feed terminator) then reset the
PARTY Flag when done.
sedoNXNYLelpitluMrofsnoitcennoCdnAgniriW:ecafretnI584-SR
retrevnoC584-SRot232-SR 1#eludoMlortnoC #eludoMlortnoC n
)-XR(ataDevieceR9niP)-XT(ataDtimsnarT 9niP)-XT(ataDtimsnarT
)+XR(ataDevieceR 01niP)+XT(ataDtimsnarT 01niP)+XT(ataDtimsnarT
)-XT(ataDtimsnarT7niP)-XR(ataDevieceR 7niP)-XR(ataDevieceR
)+XT(ataDtimsnarT 8niP)+XR(ataDevieceR 8niP)+XR(ataDevieceR
dnuorGsnoitacinummoC11niPdnuorGsnoitacinummoC 11niPdnuorGsnoitacinummoC
FFO=hctiwSTSOH
ro
)0(ESLAF=galFTSOH
FFO=hctiwSTSOH
ro
)0(ESLAF=galFTSOH
NO=hctiwSYTRAP
ro
)1(EURT=galFYTRAP
NO=hctiwSYTRAP
ro
)1(EURT=galFYTRAP
CGND
RX
TX
Host PC
RX+
TX-
TX+
RX-
CGND
Control Module #2
Control Module #1
RS-232 - RS-485
Converter
Recommended IMS
Part # CV-3222*
RX-
RX+
TX-
TX+
CGND
*If your PC is equipped
with an RS-485 Board,
no converter is necessary.
Connect RS-485 lines
directly to the Host PC.
RX+
TX-
TX+
RX-
CGND
To Other LYNX
Modules in System.
Always place resistors at last unit.
120 Termination Resistors
are recommended at both
ends of the Data Lines when
cable length exceeds 15 feet.
Ω
HOST Switch = OFF
PARTY Switch = ON
HOST Switch = OFF
PARTY Switch = ON
Data Cable Termination Resistors
Data Cable lengths greater than 15 feet (4.5 meters) are susceptible to signal reflection and/or noise. IMS recommends
120Ω termination resistors at both ends of the Data Cables. An example of resistor placement is shown in Figure 5.4.
For systems with Data Cables 15 feet (4.5 meters) or less, the termination resistors are generally not required.
For more information and other RS-485 termination techniques, search the Internet for "RS-485 Application Notes".
