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Serial Products Tutorial

How is a Serial Converter used?
Serial Converters typically consist of a minimum of two bi-directional
interfaces, one each for the different protocols being converted, for RS232
What is a Serial Converter? (Full Duplex/Half Duplex) for RS422/423/485 (Half Duplex). These interfaces
can consist of any combination of Telephony style Modular Jacks, Terminal
A Serial Converter, sometimes referred to as an Interface converter, allows Blocks or D-Subs (DB9, DB25). In the case of an RS232 to RS485 Converter,
you to convert between different serial protocols to allow for the one of the interfaces would be used to handle the RS232 signals while the
interconnectivity of various serial devices. other is used to handle the RS485 signals.

RS232: RS422: RS423: RS485:
First introduced in 1962, it is a A high-speed protocol similar to A high-speed protocol similar to A protocol developed from RS422
series of standards for serial binary RS232 but with differential signaling RS422 but with unbalanced signaling that can be used as a bus in multi-
single-ended data and control in a multi-drop configuration. in a multi-drop configuration. drop/multipoint configurations.
signals for connecting a DTE (Data It was designed for half duplex mode It uses multi-conductor cabling and It was designed for half duplex mode
Terminal Equipment) (PC) and a DCE of operation. was designed for half duplex mode of operation.
(Data Communication Equipment) of operation.
(Modem). It uses Twisted Pair cabling and can It uses Twisted Pair cabling and can
It uses multi-conductor cabling and support a maximum of 10 Devices It can support a maximum of 10 support a maximum of 32 Devices.
Devices (1) DTE & (10) DCE.
(1) DTE & (10) DCE.
can function in half duplex as well as With appropriate cabling it can be
full duplex modes of operation. It With appropriate cabling it can be With a maximum baud rate of 100 effectively used up to a theoretical
was designed for point-to-point effectively used up to a theoretical kbit/s at 40 feet (12m) 1kbit/s at distance of 4,000 feet (1,200m).
connections, (1) DTE & (1) DCE. distance of 4,000 feet (1,200m). 4,000 feet (1,200m). With a maximum baud rate of 35
The accepted max distance for With a maximum baud rate of 10 Mbit/s at 40 feet (12m) & 100 kbit/s
standard cabling is 50 feet (15m) Mbit/s at 40 feet (12m) & 100 kbit/s at 4,000 feet (1,200m).
with a maximum baud rate of 20 at 4,000 feet (1,200m).
kbit/s. Theoretically, 1kbit/s can be
achieved at 4,000 feet (1,200m).
With low-capacitance cabling the 20
kbit/s can be effectively maintained
up to a theoretical distance of 1,000
feet (300m).
Typical Serial Converter Applications

Point of Sale
Factory Automation
Point of Sale Barcode Barcode Factory Automation Temperature
Temperature
RS232 RS232 Reader Reader RS232 RS232 Flow Flow Sensor Sensor
RS485 RS485 Meter Meter
Barc
Barcode Barcode PLC PLC
Barc
Scan
Scanner Scanner
Scan
RS485 RS485 Remote I/O
Remote I/O
What is a Device Server? How is a Device Server used?
A Device Server, sometimes referred to as a Serial Server, is used to connect A Device Server has one or more serial ports and typically one RJ45
a serial network or device such as RS232 to an Ethernet Network that uses Ethernet port. After connecting the serial devices to the server, then
the IP (Internet Protocol) data transmission. connecting the server to the Ethernet Network, some set up is required to
configure the communication between the two networks via a management
application built into the Device Server.
Typical Device Server Applications

WAN Ethernet RS232
(Internet)
Robot
Robot
PLC
Device
Router Server Motor or Scale
ale
Ethernet Network (IP) Plant Network

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