Roberts Gorden UltraVac NEMA 4 - Manual (Page 27)

SECTION 5: C OMMUNICATIONS
21
5.2 RS-485 Converter for Central Controller
For remote on-site viewing of system status and
settings of any controller, use the RS-485 converter
to connect a single PC (9 pin serial port) to the RS-
485 terminals on the Central Controller. This will
allow communication between one PC and any of the
ULTRAVAC™ controllers on the network. For RS-485
converter wiring details see Page 21, Figure 14 and
see Page 25, Section 5.5 For communication cable requirements see Page 12,
Section 3.3.5
.
If multiple ULTRAVAC™ controllers are being used, the
additional controllers communicate to controller #1
through RS-485 communication wiring arranged
in-series from one controller to the next. See Page 25,
Section 5.5
. This allows multiple controllers to be
controlled from a PC through a single communication
package at the central controller.
FIGURE 14: RS-485 PC Connection
+-
1
+-
2
+-
4
+-
3
+-
5
+-
6
+-
7
+-
8
+-
+-
REF
RS485 COMM
REF
+-
1
+-
2
+-
3
+-
4
METER INPUTS
UNIVERSAL
INPUTS
IN
OUT
ADDRESS
RESET
10VDC 499 OHM
OFF ON OUT IN
G
IN
OUT
G
G
G
+5
+32
AUX POWER
RS232 DIRECT
RI
CD
OH
CPU
+ -
1
+ -
2
+ -
3
+ -
4
single
LED
+V
gnd shld
B A
(-)
(+)
Windows ®
Compatible PC
Central Controller
25-pin male to 9-pin female adapter
(supplied with RS-485 adapter)
RS-485 Adapter
RS-485 adapter power supply
(supplied with RS-485 adapter)
Wire with white stripe
to positive terminal
9-Pin Female
To Controller #2
Dip Switch #1
set to ON
Gr
o
u
nd Shield
Description Part Number
RS-485 Converter Package with
Power Supply
10080430