Future Design SNA10A User Manual

User's ManualUser's Manual

Future Design Controls SNA10A Smart Network AdaptorFuture Design Controls SNA10A Smart Network Adaptor

1.Features

* Supports both RS-485 and RS-422 Interface

* Baud Rate: 300 ~ 38400 bits/sec configurable

* Allows connection for 247 multi-drop units

* Automatic data direction control for RS-485 without the need to take

care of RTS signal.

* Precision timing control for RS-485 allows fast switching between

transmit and receive

* Universal ( 90 ~ 264 VAC ) AC power input
* Isolated between RS-232 and RS-485 / 422 eliminate common mode

noise problems

* Flexible installation: DIN rail mount or wall mount
* CE Approved

2.Introduction

SNA10A is a smart network adaptor which can be used to convert
unbalanced RS-232 signals to balanced RS-485 or RS-422 signals. SNA10A
is used for single node conversion or when communicating with 3rd party
software including Future Design Controls MultiView software.

The RS-485 is an enhanced version of the RS-422A balanced line standard.
It allows multiple drivers and receivers on a 2-wire system and reduces wiring
cost. This 2-wire system can perform half-duplex transmission only. Because
RS-422 is a 4-wire system, it can perform full-duplex transmission. The
driving capability is dependent on the input impedance of the connected
receivers.

As many as 32 standard units can be put on RS-422 or RS-485 port.
Up to 247 high impedance units, such as Future Design Control’s interface

products, can be put on RS-422 or RS-485 port.

3.RS-232C Interface3.RS-232C Interface

Pin EIA

1

CF

Description

Carrier Detect (DCD)

Source

DCE

2

3

4

5

6

7

8

9

BB

BA

CD

AB

CC

CA

CB

CE

Received Data (RD)

Transmitted Data (TD)

Data Terminal Ready (DTR)

Signal Ground (SG)

Data Set Ready (DSR)

Request to Send (RTS)

Clear to Send (CTS)

Calling Indication (RI)

UMSN10A

DCE

DTE

DTE

DTE/DCE

DCE

DTE

DCE

DCE

1

4.Specifications

Baud rate: 300 ~ 38400 bits/sec
Parity bit: None, odd or even
Data bit: 8 bits
Stop bit: 1 or 2 bits
Connectors: 9-pin Female D-SUB ( RS-232)

Screw type terminal block ( RS-485/422 )

Receiver threshold: 0.8 V min. ( RS-232 )

0.2 V ( RS-485/422 )

K

Receiver input impedance: 3K ~ 7 Kohm ( RS-232 )

96 Kohm ( RS-485/422 )

Transmission mode: Single ended ( RS-232 )

Differential ( RS-485/422 )

Transmission distance: 50 ft ( RS-232 )

5000 ft ( RS-485/422 )

Common-mode voltage: 25 V ( RS-232 )

K

+12 V, -7V ( RS-485/422 )

Driving capability: 32 receivers ( 12 Kohm input )

247 receivers ( 96 Kohm input )
Power: 90~264 VAC, 47~63 Hz, 10VA, 4W max.
Breakdown Voltage: 2500VAC, 1minute ( power to RS-232, RS-485/422 )

400 VAC, 1 minute ( between RS-232 and RS-485/422 )
Isolation resistance: >500 Mohm VS. 500 VDC
Ambient temperature: 0~50 C
Storage temperature: -20~80 C
Agency Approvals: CE Approved
Mounting method: DIN rail mount or wall mount
Dimension: 4.02” (L) X 3.15” (W) X 1.18” (H) inches
Weight: 120 grams

2.4 V max.

L

L

5.Mechanical Data5.Mechanical Data

ON

3.86”

98.0mm

CAT. IICAT. II

90-264VAC

90-264VAC

47-63HZ 10VA

47-63HZ

10VA

3.15”

80.0mm

RS-232

TR

RS-422

RS-485

0.98”

25.0mm

SNA10A

4.02”

102.5mm

LN

2

TX1

TX2 RX1 RX2

UMSN10A

1.18”

30.0mm