CEL-MAR ADA-401WA, User Manual

Fig. 4. 4-wire connection of ADA-401WA to PC by the use of USB to RS485/RS422 converter ADA-I9140

Fig. 5.  2-wire connection of ADA-401WA to PC by the use of USB to RS485/RS422 converter ADA-I9140

3.3. CONNECTION TO RS485/422 BUS

EIA-485 Standard allows to connect up to 32 devices to RS485 bus on the length of 1200m. In the purpose of connection more

devices or extend the length of the bus should be used additional devices like  separator / repeater eg. ADA-4040, ADA-4044H.

Connection of RS485 bus to ADA-401WA converter is shown on figure below.

Fig. 6. Example connection of ADA-401WA to 4-wire RS485 Bus

Fig. 7. Example connection of ADA-401WA to 2-wire RS485 Bus

6

ADA-401WA

VDD

1-W

GND

GND

USB

USB
connector

Screw
connector
RS485 / RS422

RS485(4W)
9600Bd/8/N/1

USB
connector

ADA-I9140

USB

Rx+

Rx-

Tx+/ A

Tx-/ B

Tx+ / A

Tx- / B

Rx+

Rx-

Screw
connector
1-WIRE

Screw
connector
RS485 / RS422

ADA-401WA

PC

VDD

1-W

GND

GND

USB

USB

connector

RS485 / RS422 

connector

RS485(4W)
9600Bd/8/N/1

USB

connector

ADA-I9140

USB

Rx+

Rx-

Tx+/ A

Tx-/ B

Tx+ / A

Tx- / B

Rx+

Rx-

1-WIRE

connector

RS485 / RS422

connector

ADA-401WA

PC

(5) GND

GND

(2) Rx
(3) Tx

ADA-401WA

RS485(4W) Bus

T

x+

 / 

A

T

x-

 / 

B

G

N

D

R

x+

R

x-

 RS232

connector

 PC

ADA-I1040

ADA-401WA

T

x+

/ A

T

x-

/ B

G

N

D

R

x+

R

x-

ADA-401WA

T

x+

 / 

A

T

x-

 / 

B

G

N

D

R

x+

R

x-

GND (5)

Tx (2)

Rx (3)

Rt

Rt

Rx+

Rx-

Tx+/ A

Tx-/ B

R

t

R

t

 RS232

connector

 RS485/422

connector

 R

S

4

85

/4

22

c

o

n

n

e

ct

o

r

 R

S

4

85

/4

22

c

o

n

n

e

ct

o

r

 R

S

4

85

/4

22

c

o

n

n

e

ct

o

r

(5) GND

GND

(2) Rx

(3) Tx

ADA-I1040

GND (5)

Tx (2)

Rx (3)

Rt

Rx+

Rx-

Tx+/ A

Tx-/ B

ADA-401WA

RS485(2W) Bus

ADA-401WA

ADA-401WA

 RS232

connector

 RS232

connector

 RS485/422

connector

 PC