N-Tron SER-485-IC Quick Start Guide

SER-485-IC_0710 R2

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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°

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.

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 SER-485-IC Serial Converter
 This Quick Start Guide
 Additional Items Required but not included

o A 10 to 48 VDC Power Supply, 0.2A.
o RS-232 cable. The converter is a DCE device.
o RS-422/485 Cable.

Quick Start Guide

SER-485-IC

Triple Isolated RS-232 to

RS-422/485 Converter

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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

Transmit Bias Resistor

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Front Panel

1

Power TB

2 Position, Removable

2

RD LED

Red, Flashes when RS-422/485

Data Received

3

DB9 Female

RS-232 (Wired DCE)

4

422/485 TB

5 Position, Removable

5

TD LED

Red Flashes when RS-422/485

Data Transmitted

6

Power LED

Red, ON When Power Applied

7

Dip Switch

12 Position

DB9 Female Pin out (DCE)

Pin

Signal

Direction

1

Receive Line Signal Detector (DCD)

---

2

Receive Data (RD)

OUTPUT

3

Transmit Data (TD)

INPUT

4

DTE Ready (DTR)

---

5

Signal Ground (SG)

---

6

DCE Ready (DSR)

---

7

Request to Send (RTS)

---

8

Clear to Send (CTS)

---

9

Ring Indicator (RI)

---

Note: Pin 1, Pin 4, and Pin 6 are tied together internally.
Pin 7and Pin 8 are tied together internally.

RS-422/485 Terminal Block

Terminal

RS-485 2-Wire

RS-422/485 4-Wire

A

GND

GND B Data B(+)

RDB(+)

C

Data A(-)

RDA(-)

D

---

TDB(+)

E

---

TDA(-)

Put

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

PH: 251-342-2164 · FAX: [phone]

N-Tron Corp.

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Power Requirements:
10 – 48 VDC @ 0.2A

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1. DB9 F is DCE, Pin 2(RD) is the converter’s RS-232
Data output. Pin 3 (TD) is the converter’s RS-232

Data input.

2. Pins 1, 4, and 6 (DCD, DTR, and DSR) are tied
together inside the converter.

3. Pins 7 and 8 (RTS and CTS) are tied together
inside the converter.

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Two Wire RS-485

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 Configure for RS-485 Four wire, 9600 baud
 Jumper terminals B to D and C to E
 Connect a PC to the RS-232 port (see Step 7).
 Using hyper terminal or similar program, connect to

the appropriate COM port (remember to set the
baud rate to 9600).Turn off hyper terminal local
echo

 Transmit data. The same data should be returned.

LED Indicators: Power is ON when power is applied.
TD flashes when RS-422/485 data is sent. RD
flashes when RS-422/485 Data is received.

RS-422/ Four Wire RS-485

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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 R-11

Timeout

(Kbps)

8 through 12

Value

(ms)

1.2

OFF

820 KΩ

8.32

57.6

OFF

16 KΩ

0.16

115.2

OFF

8.2 KΩ

0.08

Pre-defined timeouts are set using switches 8 through 12.
Resistor selectable baud rates are set by inserting a through
hole resistor (R-11) 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-IC_0710 R2

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

PH: 251-342-2164 · FAX: [phone]

N-Tron Corp.