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
6.Application
( 1 ) RS-485 Interface Wiring
PC
9-pin
RS-232 port
Female
9-pin D-SUB
90 264 VAC~
TX1 TX2 TX1 TX2 TX1 TX2
FUSE
ON
CAT. II
90-264VAC
47-63HZ 10VA
L N
RS-232
TR
RS-422
RS-485
TX1
TX2 RX1 RX2
Male
9-pin D-SUB
SNA10A
220 ohms
1/2 W
TX1 TX2
UNIT #1 UNIT #2 UNIT #247
A 220 ohms 1/2 W termination resistor across the TX1 and TX2 terminals of the last unit in the
network is required. (Resistor not included)
( 2 ) RS-422 Interface Wiring
RS-232
ON
TR
Male
9-pin D-SUB
SNA10A
PC
9-pin
RS-232 port
Female
9-pin D-SUB
FUSE
90 264 VAC~
CAT. II
90-264VAC
47-63HZ 10VA
L N
RS-422
RS-485
TX1
TX2 RX1 RX2
RX1 RX2 TX1 TX2 RX1 RX2 TX1 TX2 RX1 RX2 TX1 TX2
UNIT #1
A 220 ohms 1/2 W termination resistor across the receive terminals of the last unit in the
network is required.
220 ohms
1/2 W
RX1 RX2 TX1 TX2
UNIT #2 UNIT #247
UMSN10A
3
7.DIP Switch Setting7.DIP Switch Setting
SNA10 DIP SWITCH SETTING
= ON POSITION
BLANK = OFF POSITION
345678
Interface
Parity Bit
Stop Bit
Baud Rate (bps)
12
RS-422
RS-485
None
Even
Odd
1bit
2bit
300
600
1200
2400
4800
9600
14400
19200
28800
38400
8.Ordering Data8.Ordering Data
SNA10A: Smart Network Adaptor for Future Design Controls mulit-drop Multiview software
or third party software
SNA10A
Smart Network Adapter
Future Design Controls
7524 West 98th Place
Bridgeview, IL 60455
Phone 888-751-5444
Fax 888-307-8014
E-mail csr@futuredesigncontrols.com
www.futuredesigncontrols.com
Rev 2 6/2008
4
UMSN10A
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