1 - 20 Modular LYNX System 12.05.2003
Connecting the RS-485 Interface
Single Controller System
In a Single Controller System, the RS-485 interface option would be used if the Control Module is located at
a distance greater than 50 feet from the Host PC. Since most PC’s do not come with an RS-485 board pre-
installed, you will have to install an RS-485 board in an open slot in your PC, or purchase an RS-232 to RS-
485 converter, such as the CV-3222 sold by IMS, to use this connection interface. For wiring and connection
information please use the following table and diagram:
Table 5.4: RS-485 Interface Connections
Figure 5.3: RS-485 Interface, Single Controller System
rodraoB584-SR
retrevnoC584-SRot232SR
eludoMrellortnoCXNYL
)-XR(ataDevieceR9niP)-XT(ataDtimsnarT
)+XR(ataDevieceR 01niP)+XT(ataDtimsnarT
)-XT(ataDtimsnarT7niP)-XR(ataDevieceR
)+XT(ataDtimsnarT 8niP)+XR(ataDevieceR
dnuorGsnoitacinummoC11niPdnuorGsnoitacinummoC
LYNX Control Module
CGND
RX
TX
Host PC
RS-232 To RS-485 Converter
Recommended IMS Part # CV-3222*
If your PC is equipped with an RS-485 Board
no converter is necessary. Connect RS-485
lines directly to Host PC as shown.
DIR+
DIR-
SCK-
SCK+
GND
+5V
RX-
RX+
TX-
TX+
CGND
RX
TX
22
21
23
24
25
26
31
32
33
34
35
36
IG
123456
123456 123456
22
21
23
24
25
26
31
32
33
34
35
36
GND
V+
A1
A0
A2
PT
HI
UG
TM
RX-
RX+
TX-
TX+
CGND
N
N
