N-Tron SER-485-IR Quick Start Guide

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 SER-485-IR Isolated Repeater
 This Quick Start Guide
 Additional Items Required but not included

o A 10 to 48 VDC Power Supply.
o RS-422/485 Cables.

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1. Power, input /output (I/O) wiring must be in
accordance with Class 1 Division 2 wiring methods
[Article 501.10(B) of the National Electric code,
NFPA70] and in accordance with the local authority
having jurisdiction.

2. Maximum ambient air temperature 80°C

3. WARNING – EXPLOSION HAZARD:
SUBSTITUTION OF COMPONENTS MAY IMPAIR
SUITABLITY FOR CLASS 1, DIVISION 2.

4. WARNING – EXPLOSION HAZARD: WHEN IN
HAZARDOUS LOCATIONS, TURNING OFF
POWER BEFORE REPLACING OR WIRING
MODULES

5. WARNING – EXPLOSION HAZARD: DO NOT
DISCONNECT EQUIPMENT UNLESS POWER HAS
BEEN SWITCHED OFF OR THE AREA IS KNOWN
TO BE NON-HAZARDOUS.

6. WARNING – THIS APPARATUS IS SUITABLE FOR

USE IN CLASS 1 DIVISION 2, GROUPS A, B, C,
AND D, OR UNCLASSIFIED AREAS.

Quick Start Guide

SER-485-IR

Triple Isolated RS-422/485

Repeater

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Front Panel

1

Power TB

2 Position, Removable

2

DATA LED

Red, Flashes when RS-422/485

Data Received on TB1

3

TB 1

5 Position, Removable

4

TB 2

5 Position, Removable

5

DATA LED

Red Flashes when RS-422/485

Data Transmitted on TB2

6

Power LED

Red, ON When Power Applied

7

Dip Switch

12 Position, One on the top of the

Unit, on the bottom of the unit

RS-422/485 Terminal Blocks

TB1

RS-485 2-Wire

RS-422/485 4-Wire

A

GND

GND

B

Data B(+)

RDB(+)

C

Data A(-)

RDA(-)

D

---

TDB(+)

E

---

TDA(-)

TB2

RS-485 2-Wire

RS-422/485 4-Wire

F

GND

GND G Data B(+)

RDB(+)

H

Data A(-)

RDA(-)

I

---

TDB(+)

J

---

TDA(-)

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Communications Mode

1 2 3 4 RS-485

ON

ON

ON

ON

2-Wire

Half Duplex

RS-485

ON

OFF

OFF

OFF

4-Wire

Full Duplex

RS-422

OFF

OFF

OFF

OFF

Full

Duplex

Termination Resistor

5

Use the 120Ω

ON

Built in Termination

Use External

OFF

or no termination

Transmit Bias

6

Use the 1.2KΩ

Transmit

OFF

Bias Resistor

Use External or no

ON

Transmit Bias Resistor

Receive Bias

7

Use the 1.2KΩ Receive

OFF

Bias Resistor

Use External or no

ON

SER-485-IR_2510 R3

N-Tron Corp.

820 S. University Blvd. Suite 4E, Mobile, AL 36609

PH: 251-342-2164 · FAX: [phone]

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Power Requirements:
10 – 48 VDC @ 0.2A

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Two Wire RS-485

RS-422 / Four Wire RS-485

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1. During normal operation, the Power LED
should be illuminated.

2. When data is sent or received on either port,
the corresponding Data LED should flash.

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Switch Selectable

Baud Timeout

(Kbps)

8 9 10

11

12

(ms)

2.4

ON

OFF

OFF

OFF

OFF

4.37

4.8

OFF

ON

OFF

OFF

OFF

2.03

9.6

OFF

OFF

ON

OFF

OFF

1.02

19.2

OFF

OFF

OFF

ON

OFF

0.57

38.4

OFF

OFF

OFF

OFF

ON

0.27

Resistor Selectable

Baud

Timeout

(Kbps)

8 through 12

R-7 / 28 Value

(ms)

1.2

OFF

820 KΩ

8.32

57.6

OFF

16 KΩ

0.16

115.2

OFF

8.2 KΩ

0.08

230.4

OFF

4.3 KΩ

0.04

460.8

OFF

2.2 KΩ

0.02

Pre-defined timeouts are set using switches 8 through 12.
Resistor selectable baud rates are set by inserting a through
hole resistors (R-7 and R-28) on the circuit board.

Timeout selections are equal to one character time at the
indicated baud rate. Setting the converter to 9600 will
generally work at 9600 and higher baud rates. In RS-422

mode, timeouts are not required.

SER-485-IR_2510 R3

N-Tron Corp.

820 S. University Blvd. Suite 4E, Mobile, AL 36609

PH: 251-342-2164 · FAX: [phone]