User's Manual
User's Manual
Future Design Controls SNA10A Smart Network Adaptor
Future Design Controls SNA10A Smart Network Adaptor
1.Features
* Isolated between RS-232 and RS-485 / 422 eliminate common mode
noise problems
* 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
* Flexible installation: DIN rail mount or wall mount
* CE Approved
UMSN10A
1
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 Inter face
3.RS-232C Inter face
Pin
EIA
Description
Source
1
CF
Carrier Detect (DCD)
DCE
2
BB
Received Data (RD)
3
4
5
6
7
8
9
BA
CD
AB
CC
CA
CB
CE
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)
DCE
DTE
DTE
DTE/DCE
DCE
DTE
DCE
DCE
