RS-232
↔
RS-485 INTERFACE CONVERTER
6
There are three models of this interface converter:
• IC485A-R2 — an RS-232
↔
RS-485 interface
converter standalone unit for 115 VAC
operation.
• IC485AE-R2 — a standalone unit for
220 VAC operation.
• IC485C-R2 — a rackmounted printed-circuit
card.
The same Card is used for both 115 volts and
230 volts.
An Interface Converter Rack is also available. This
is a 19" rack capable of holding up to eight printed
circuit cards. It operates in either
115-VAC or 230-VAC applications. The rack
(RM060) has its own power supply, which is
switchable between 115- and 230-VAC operation.
IBM PC
OR OTHER
DTE DEVICE
RS-232/RS-485
INTERFACE
CONVERTER
RS-232 PORT = DCE
RS-485 PORT = DTE
(GROUND
OPTIONAL)
RS-485
DEVICE
DCE
22
4
24
6
19
R+
R-
T+
T-
GND
DB25
STRAIGHT
CABLE
Figure 2-2. 4-Wire Asynchronous Application.
TYPICAL CABLE
CONFIGURATION FOR IBM PC
(RS-232)
DB25 FEMALE
DB25 MALE
IBM PC
CONVERTER
2
3
7
4
5
6
8
20
2
3
7
4
5
DEPENDING ON THE
SOFTWARE IN YOUR PC,
THIS SETUP MAY BE
NECESSARY
NOTE: THIS CONVERTER
IS CONFIGURED AS
DCE (ON RS-232 PORT)
Figure2-3. Cable Configuration for the IBM PC.
