Future Design SNA10A User Manual

User's Manual User's Manual
Future Design Controls SNA10A Smart Network Adaptor Future 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 Interface

3.RS-232C Interface
Pin EIA
1 CF
2 BB
3 BA
4
CD
5
AB
6
CC
7
CA
8 CB
9 CE
Description
Carrier Detect (DCD)
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)
Source
DCE
DCE
DTE
DTE
DTE/DCE
DCE
DTE
DCE
DCE
UMSN10A
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