System 50
COMMUNICATION
CONVERTERS
RS-232 to RS-422/485
FEATURES
• Selectable RTS operation for 2
wire applications
• Transient Protection on the
RS-422/485 Lines
´ On-Board Power Supply With
Jumper Selectable 110/220 Vac
Operation
• Optical Isolation Between RS-232
and RS422/485
• DIP Switch Selectable DTE/DCE
Setting
• Multiple Mounting and Connector
Options
GENERAL DESCRIPTION
The 72-CNV-XX family of converters offer a
flexible and reliable solution to the challenge of
interfacing devices conforming to different serial
communication standards. Grayhill converter
products are designed for industrial
environments. All communication lines have
transient protection which other commercially
available converters lack. The converters allow
an RS-232 device (ie. PCs, PLCs, Embedded
Controllers) to communicate reliably over long
distances to multiple devices utilizing the RS-
422/485 standard. Reliability is an inherent benefit
of the differential mode communication of RS-
422/485. Noise introduced onto the RS-422/485
link affects both the positive and negative side
equally, preserving the integrity of the differential
signal between them. Long distances and multiple
slave devices are supported by the converters.
In half-duplex (2-wire) RS-485 mode,
System 50
handshaking can be controlled from either end of
the communication link. Typical applications
involve connecting a host computer to remotely
located serial devices such as printers, control
equipment, or data acquisition devices distributed
throughout an office or factory.
The multiple mounting and connector options
allow for many installation possibilities. All three
versions conform to a Eurocard 3U size (160 mm
x 100 mm). 72-CNV-10 will mount in a DIN 41494
card cage. AC power and the RS-422 signals are
brought out to a DIN standard 41612 15-pin
connector (Harting p/n 09061152911 or
equivalent). 72-CNV-11 has standoffs to facilitate
panel mounting. AC power comes in to a screw-
type terminal strip. RS-422 signals are on a
separate terminal strip or a female DB-9
connector. 72-CNV-12 has a DIN rail card
carrier which permits the assembly to snap on
a DIN rail. AC power and RS-422 signals are
brought in to two screw-type terminal strips. A
female DB-25 connector transfers the RS-232
signals for all three versions.
SPECIFICATIONS
Supply Voltage Range (V
ps
):
110/220 Vac
(jumper selectable)
Maximum Supply Current (I
ps
):
120 mA
Isolation Voltage:
4000 Vac
Transmission Rate:
300 to 115,200 Baud
Operating Temperature Range:
0 to 60°C
95% relative humidity, non-condensing
Indicators:
TX, RX, CTS, RTS and Power
Description
ORDERING INFORMATION
Part Number
72-CNV-10
72-CNV-11
72-CNV-12
RS-232 to RS-422/485 converter for DIN card cage
(Pictured)
RS-232 to RS-422 converter for panel mount
RS-232 to RS-422/485 converter for DIN rail mounting
72-CNV-2, 72-CNV-4 AND 72-CNV-5
72-CNV-4 and 72-CNV-5 convert serial
communications from RS-232 to RS-485 in
both directions. The converter simply plugs
into any male RS-232 DB-25 connector and
converts the transmit and receive signals to
RS-485 (RS-422) levels at speeds to 115.2
KB. The converters are configured for DTE
(default) or DCE operation.
The 72-CNV-2 is similar to the 72-CNV-4
except that it provides optical isolation and
operates only in an RS-422 mode at a maximum
rate of 19.2 KB.
Supply Voltage:
+8 to +15 Vdc (-2 and -4 versions)
+5Vdc (-5 version)
Supply Current:
62 mA plus output load (-2 version)
30 mA plus output load (-4 and -5 version)
Operating Temperature Range:
0-60°C
ORDERING INFORMATION
Part Number
72-CNV-2
72-CNV-4
72-CNV-5
Description
RS-232 to RS-422 converter with optical isolation
RS-232 to RS-422/485 converter with 8 to 15V operation
RS-232 to RS-422/485 converter with 5V operation
For prices and discounts, contact a local Sales
Office, an authorized Distributor, or Grayhill.
Available from your local Grayhill Distributor.
System 50
Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois 60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com
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