INSTRUCTIONS: Model 4683-TTM-xF
AC-Powered RS-485 Network Repeaters
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Acromag Incorporated, 30765 South Wixom Road • P.O. Box 437 • Wixom, MI • 48393-7037, USA
Phone: (248) 295-0880 • Fax: (248) 624-9234 • E-mail: [email protected] • On-Line: http://www.acromag.com
Copyright 1990, Acromag, Inc. Printed in the USA. 8500-758-C08H015
MODEL DESCRIPTION
Model Power
4683-TTM-1F 115V AC ±10%
4683-TTM-2F 230V AC ±10%
4683-TTM-3F 24VAC ±10%
These devices are “rugged” RS-485 network repeaters used for
isolating network signals and extending communication
distances. Model 4683-TTM-xF units are similar to the
Acromag Model 4SCR-TTM-x models, but add field-selectable,
End-Of-Line (EOL) network terminations on board for both the
A and B sides, are UL/cUL approved, and work at higher baud
rates.
Operation is transparent to all other network devices and no
handshaking is required. Up to 32 RS-485 devices can be
driven. These repeaters are enclosed in a rugged aluminum
enclosure and come ready to mount on any base plate, or can
be installed into a NEMA enclosure for harsh environments.
Installation is as simple as mounting, setting the baud rate,
connecting and terminating the network, and connecting power.
FEATURES
● Designed for use with Johnson Controls N2 or BACnet
MS/TP bus.
● No handshaking & No extra control lines required.
● Full I/O signal isolation.
● Supports baud rates of 600, 1200, 2400, 4800, 9600,
19.2K, 38.4K, and 76.8K, switch-selectable.
● Field-selectable, End-of-Line (EOL) network terminators on
both the A (input) and B (output) sides.
● Transient protection installed to help protect connected
devices from destructive noise spikes and line transients.
● Status LED’s indicate transmission direction, RS-485 bus
fault conditions, and power.
● 115VAC, 230VAC, and 24VAC models supported (no
separate transformers are required for 24VAC models).
OPERATION
The Model 4683-TTM-xF network repeaters are used to isolate
and boost RS485 signals and extend network distance. Each
repeater will permit the addition of up to another 32 devices to a
network, and extend the communication distance another 4000
feet.
The repeater has two “sides” referred to as side A and side B.
Side A typically connects to the network towards the host (input
side). Side B connects to the extended network (output side).
Functionally, sides A and B are equivalent. Transient signal
protection is provided on both RS-485 sides. When both RS-
485 lines are idle, each side is in the receive mode. When a
one to zero transition is detected (signifying a start bit) on either
side, the opposite side’s transmitter is enabled (half-duplex).
The transmitter stays enabled for one character’s time (based
on the baud rate switch setting). The character received is then
passed through.
The repeater receives AC power through a three-screw terminal
strip. Input power is fused and isolated. Model 4683-TTM-1F
units require 115VAC, 4683-TTM-2F units require 230VAC, and
4683-TTM-3F units require 24VAC.
COMMUNICATION SPECIFICATIONS
Baud Rates: DIP switch settings on unit for 600, 1200, 2400,
4800, 9600, 19.2K, 38.4K, & 76.8K baud rates. Only one
switch must be closed according to baud rate required for
proper operation.
RS-485 Bus Loading: One unit load equivalent.
RS-485 Bus Drive: Complete RS-485 compliance for up to 32
unit loads (31 unit loads if a repeater is used).
End-of-Line Termination Network: Refer to Figure 1. The
EOL termination network is individually selected for both
the A and B sides by a pair of shorting clips. The A side
(input) is controlled by jumpers J1 & J2. The B side
(output) is controlled by jumpers J3 & J4.
The EOL network termination is enabled
for the A side or
the B side when the associated pair of jumpers are
positioned over pins 1 and 2. The EOL termination is
disabled (removed from circuit) when the pair of jumpers
are positioned over pins 2 and 3.
Duplex: Half duplex only.
Data Format: Ten bits typical (1 start bit, 8 data bits, and 1
stop bit). Other formats are supported.
Status Indicators: Red power LED; red RS-485 bus fault
LED’s, side A & B; green transmit LED’s, A-to-B & B-to-A.
PHYSICAL SPECIFICATIONS
Operating Temperature: -25°C to 70°C (-13°F to 158°F).
Relative Humidity (RH): 10 to 95% RH (non-condensing), up
to 40° C (104° F).
Power: 115VAC ±10%, 50/60Hz, 0.05A (Model 4683-TTM-1F);
230VAC ±10%, 50/60Hz, 0.03A (Model 4683-TTM-2F);
24VAC ±10%, 50/60Hz, 0.18A (Model 4683-TTM-3F).
Power Line Fuse: 0.5A, 250V, 3AG type. Refer to Figure 1
for fuse location.
Isolation: Unit includes galvanic and optical isolation between
RS-485 side A, RS-485 side B, AC power, and chassis
ground. Common mode voltages of up to 250Vrms, or
354V DC (withstands a 1500V AC dielectric strength test
for 1 minute without breakdown), are permitted on a
continuous basis. This complies with test requirements
outlined in ANSI C39.5-1974 for voltage ratings specified.
RFI Resistance: Withstands RFI field strengths of up to 10V
per meter at 27MHz, 151MHz, and 467MHz with no digital
effect, per SAMA PMC 33.1 test procedures.
Line Noise Effects: Field and power line terminals withstand
ANSI/IEEE C37.90-1978 Surge Withstanding Capability
(SWC) Test with no component failures. Unit is tested to
a standardized test waveform that is representative of
surges (high-freq. transient electrical interference),
observed in actual installations.
Communication Connections: Network repeater – both RS-
485 connections use modular terminal blocks with screw
clamps. Wire range is 14 to 26 AWG.
Power Wire Connections: Network repeater terminal block.
See label on unit for power to be applied to unit.
Approvals: UL/cUL Listed, US & Canada, Energy
Management Equipment.
Shipping Weight: 3.0 pounds (1.4 kg) packed per unit.
Acromag, Inc. Phone: (248) 295-0880 • Fax: (248) 624-9234 - 2 - • E-mail: sales@acromag.com • On-Line: http://www.acromag.com
REPEATER INSTALLATION
Mounting
Refer to Figure 1 below for mounting and clearance
dimensions.
This device is packaged in a rugged aluminum enclosure and
no auxiliary enclosure is required for most applications.
Mounting holes are provided for surface mounting the unit. You
may use an auxiliary enclosure to protect the unit in
unfavorable environments or vulnerable locations.
Termination Jumpers
Any RS-485 network will require that the network be properly
terminated at the ends of a network, or network segment.
Termination is usually found at the first and last node of a
network segment. Since a repeater is used to segment a
network, two sets of termination resistors will be required. One
at the input side and one at the output side.
Model 4683-TTM-XF units include selectable End-Of-Line
(EOL) termination resistors that can be enabled or disabled by
positioning jumper blocks on headers installed on the circuit
board (see Figure 2). You will have to remove the top cover to
gain access to these jumpers. Be sure to turn power OFF
before removing the cover or setting these jumpers. Simply
remove the single screw on each side of the enclosure and
slide the top cover off. Refer to Figure 2 of the following page
to locate and set these jumpers as required for your installation.
Optionally, you may leave these jumpers in their disabled
position and attach 120Ω termination resistors externally,
between the RT terminals adjacent to the network connections,
but this can only be used if the trunk bias is applied somewhere
else on the network (Reference Section 4.4.1 “Idle-line Fail-
safe” of the TIA Telecommunications systems bulletin
application guideline for TIA/EIA-485A).
Setting The Baud Rate
The unit includes an 8-position DIP switch (S1) along the
bottom edge. This switch is used to set the baud rate of the
repeater. Only the switch that corresponds to the required
baud rate should be closed (refer to label information next to
S1)—all other switches must be left in the OPEN position.
Electrical Connections (Refer To Figures 1-4)
Terminals can accommodate wire from 14-26 AWG, solid or
stranded.
1. Network - Input (Side A) & Output (Side B): Connect unit
as shown in Figures 3 and 4. Be sure to enable EOL
termination as required at the ends of the network. Make
sure the baud rate DIP switches are set to match the data
rate of the network.
2. Power: Connect AC power as shown in Figure 4 according
to model number. Input power is fused (3AG type, 0.5A,
250V). Refer to Figure 2 to locate this fuse if the red power
LED fails to light with power applied.
3. Ground: Ground unit at AC input ground (G) terminal. The
chassis is common to this earth ground connection.
T
21
S1
543 876
T
T
D
D
NC
R
R
D
COM
RTN
24VDC
4.30
2.10
TYP
0.30
3.70
BAUD
RATE
T
(53.34)
(7.62)
(93.98)
acromag
FAULT
A
6.40
7.0
R
R
RS-485
SIDE A
TX
B - A
COM
RS-485
SIDE B
FAULT
B
TX
A - B
D
24VDC
(177.80)
TYP
0.30
POWER
(109.22)
(162.56)
1 - 600 5 - 9600
2 - 1200 6 - 19.2K
3 - 2400 7 - 38.4K
4 - 4800 8 - 76.8K
FIGURE 1
(7.62)
MODEL 4683-TTM-XF REPEATER
MECHANICAL DIMENSIONS
Acromag, Inc. Phone: (248) 295-0880 • Fax: (248) 624-9234 - 3 - • E-mail: sales@acromag.com • On-Line: http://www.acromag.com
3 2 1
J4
2
J1
2 2
J2
RTN
2
3
COM
D
D
R
T
T
R
NC
S1
D
D
D
D
T
3 2 1
3
1
3
1
3
1
24VDC
J4
1
867
J2J1
534 2 1
J3
J2
J4 J3
2
J1
COM D
D
COM
COM
3
2
R
T
R
COMG
F1
Vcc
D
D
EOL
DISABLED
EOL
DISABLED
3
1
RS-485
SIDE B
24VDC
J3
TX
A - B
FAULT
B
RS-485
SIDE B
1
TX
B - A
RS-485
SIDE A
BAUD
RATE
GW
L2
G
FAULT
A
FUSE 3AG
0.5A, 250V
Status
LED's
Status
LED's
AC (HI)
1200 OHMS
HOT
POWER
220 OHMS
1200 OHMS
JUMPER PAIR
(ONE SIDE)
EOL
ENABLED
EOL Jumpers
Side B (OUT)
EOL
ENABLED
EOL Jumpers
Side A (IN)
GROUND
AC (LO)
RS-485
SIDE A
L1
L1
1 - 600 5 - 9600
2 - 1200 6 - 19.2K
3 - 2400 7 - 38.4K
4 - 4800 8 - 76.8K
FIGURE 2
EOL JUMPERS
EQUIVALENT CIRCUIT
(4683 UNITS ONLY)
NETWORK CONNECTIONS
4683-TTM-3F (24VAC)
4683-TTM-1F (115VAC)
4683-TTM-2F (230VAC)
REMOVE THIS SCREW ON EACH
SIDE TO REMOVE COVER
MODEL 4683-TTM-XF REPEATERS
End-of-Line (EOL) Termination Jumper Locations.
Input Power Fuse Location.
NOTE: 4683-TTM-3F UNITS ARE 24VAC POWERED
DIRECTLY AND DO NOT REQUIRE A SEPARATE
TRANSFORMER. THESE UNITS CAN SHARE THE
24VAC POWER BUS OR TRANSFORMER THAT IS
POWERING YOUR OTHER RS485 DEVICES.
Baud Rate
Switches
Rx
S1
Tx
R
T
D
COM
1
R
0
R
1 1
R
0
R
1
T
R
R
T
D
COM
R
T
D
COM
0
R
ST
1
R
0
R
ST
1
R
0
R
ST
21 543 768
24VDC
24VDC
1 243 5768
24VDC
24VDC
DFT DFT DFT
POWER
R
T
D
RTN
0
ST
RUN
RUN
ST
0
ST
RUN
RUN
ST
acromag
D
S1
NC
R
T
D
RTN
1
RUN
0
RUN
ST
1
RUN
0
RUN
ST
1
RUN
BAUD
RATE
COM
DFT
Acromag
A-N3
DFT
Acromag
A-N5
BAUD
RATE
B-N1
Acromag
B-N3
DFT
Acromag
B-N5
DFT
Acromag
1 - 300 5 - 4800
2 - 600 6 - 9600
3 - 600 7 - 19.2K
4 - 2400 8 - 38.4K
AC INPUT
TB 1
RS-232C
232 >
485
RS485
FAULT
TB 2
RS-485
FAULT
A
TX
B - A
RS-485
SIDE B
FAULT
B
acromag
POWER
HOST PC
A-N1
RS-485
DFT
Acromag
A-N4
DFT
Acromag
UP TO 4000 FEET
SIGNAL REPEATER
RS-485
OUTPUT
(SIDE B)
Acromag
ANY RS-485 DEVICE
Acromag
B-N4
B-N32
485 >
232
120
A-N2
1 - 600 5 - 9600
2 - 1200 6 - 19.2K
3 - 2400 7 - 38.4K
4 - 4800 8 - 76.8K
RS-485
SIDE A
TX
A - B
B-N2
ANY RS-485 DEVICE
MODEL 4SCC-TTM-1
MODEL 4SCC-TTM-2
MODEL 4683-TTM-XF
A-N32
INPUT
(SIDE A)
RS-485
RS-485
UP TO 4000 FEET
NETWORK SEGMENT 2
NO TERMINATION RESISTOR
UP TO 32
NODES PER
NETWORK
SEGMENT
NETWORK SEGMENT 1RS-232
FIGURE 3
SIDE-B EOL TERMINATION
JUMPERS ENABLED
UP TO 32
NODES PER
NETWORK
SEGMENT
(EXTENDED NETWORK)
MODEL 4683-TTM-X REPEATER
STATION CONFIGURATION
RS232-TO-RS485 SIGNAL CONVERTER
SIDE-A EOL TERMINATION
JUMPERS ENABLED
120 OHM TERMINATION
RESISTOR REQUIRED
AT END OF NETWORK
OR LAST DEVICE ONLY
OPTIONALLY, YOU MAY CONNECT TERMINATION RESISTORS EXTERNALLY
BETWEEN THE RT TERMINALS ADJACENT TO THE NETWORK CONNECTIONS
FOR SIDE A AND SIDE B, BUT THE INTERNAL JUMPERS MUST BE SET TO
DISABLED WHEN USING EXTERNAL TERMINATION.
120 OHM TERMINATION
RESISTOR REQUIRED
THIS END
The station configuration drawing of Figure 3 is for general illustration purposes only. Johnson
Controls systems customers should instead refer to the Metasys® Network Technical Manual for N2
Bus Communication, or the MS/TP Communication Bus Technical Bulletin for wiring connections
using the 4683-TTM-xF repeater.
Acromag, Inc. Phone: (248) 295-0880 • Fax: (248) 624-9234 - 4 - • E-mail: sales@acromag.com • On-Line: http://www.acromag.com
R R R R
RTN
T
D D
32
D
65
T
8
D Tx
R R R R
32 5 2345 78 10 11 12 13
6789 14 15 17 18 20 22 23 25
R
R
R 24VDC
COM
8
TX
B - A
R
765432
COM COM
1
24VDC
24VDC
AC INPUT
14 1 69
16 19 21 24
2
3
T
D
NC
COM
1 4 7
T
R
T
R
T
D
Rx
S1
POWER
W L2
POWER
FAULT
A
BAUD
RATE
RS-485
SIDE A
A-N3
24VDC
485 >
232
S1
NC
R
RS-485
SIDE B
TB 2
RS-485
232 >
485
RS485
FAULT
TX
A - B
FAULT
B
RTN
TB 1
RS-232C
BAUD
RATE
1 - 600 5 - 9600
2 - 1200 6 - 19.2K
3 - 2400 7 - 38.4K
4 - 4800 8 - 76.8K
L1
W
L1
L2
OR
C
A
COM
TX
RX
TX
RX
5 COM
TX
RX
7
3
DSR
RX
RTS
G
L1
G
L1
G
A-N1
A-N2
A B C
G G
B
2
CD
CTS
TX
acromag
AC (LO)
-1 OPTION
115VAC
RED POWER LED
AC (LO) COM AC (LO)
-3 OPTION
24VAC
4 - 2400 8 - 38.4K
1 - 300 5 - 4800
6 - 96002 - 600
3 - 2400
4 - 4800
7 - 38.4K
8 - 76.8K
S1 - BAUD RATE
1 - 600 5 - 9600
1 - 600 5 - 9600
2 - 1200 6 - 19.2K
3 - 2400 7 - 38.4K
4 - 4800 8 - 76.8K
B-N1
NC
A-N32
A-N31
120 OHM
TERMINATION
REQUIRED
RS232
AC (HI)
AC (LO)
-2 OPTION
C
B
A
HOST
DE9
COM
DB25
Ground
AC (HI)
acromag
Ground
AC (HI)
Ground
HOT AC (HI)
ANY
RS485
DEVICES
S1 - SET BAUD RATE
TO MATCH BAUD
RATE OF NETWORK.
S1 - BAUD RATE
3 - 1200 7 - 19.2K
S1 - SET BAUD RATE
TO MATCH BAUD
RATE OF NETWORK.
2 - 1200 6 - 19.2K
RS485 REPEATER
MODEL 4683-TTM-X
RS485
A-N30
B-N2
B-N3
RS485
POWER
CONNECTION
RED POWER LED
B-N4
B-N5
Ground
230VAC
UP TO 32
NODES PER
NETWORK
SEGMENT
B-N32
COM
SIGNALS AT
CONVERTER
HOST
RED RS485 FAULT LED (SIDE A)
TRANSMIT DIRECTION
B-TO-A & A-TO-B
-2 OPTION
230VAC
GROUND
AC (HI)
AC (LO)
-1 OPTION
SET BAUD RATE AT S1
TRANSMIT DIRECTION
RS485-TO-RS232 AND RS232-TO-RS485
DE9
DB25
TO HOST
RS232 CONNECTIONS
TO HOST COMPUTER
HOST PC
RED RS485 FAULT LED (SIDE B)
NOTE: SIDE-A AND SIDE-B EOL
TERMINATION JUMPERS ENABLED
UP TO 32
NODES PER
NETWORK
SEGMENT
FIGURE 4
L1 W 115VAC
L1 L2 230VAC
115VAC
Ground
RS232 TO RS485 CONVERTER
MODEL 4SCC-TTM-X
RED RS485 FAULT LED
120 OHM TERMINATION
RESISTOR REQUIRED
AT END OF NETWORK
OR LAST DEVICE ONLY
IMPORTANT:
MODEL 4683-TTM-X UNITS
INCLUDE INTERNAL, FIELD
SELECTABLE END-OF-LINE
(EOL) TERMINATION
RESISTORS FOR THE A AND
B SIDES. THESE ARE
ENABLED VIA INTERNAL
JUMPERS. DO NOT USE
EXTERNAL TERMINATION
WITH INTERNAL EOL
JUMPERS ENABLED.
SEE UNIT LABEL
TO VERIFY POWER
REQUIREMENTS
NOTE: JUMPERED PINS ARE
NULL-MODEM CONNECTIONS
WHICH ALLOW COMMUNICATION
BETWEEN THE HOST AND
ACROMAG SERIES 4100/4200
I/O STATIONS.
EXTENDED NETWORK
ANY RS-485 DEVICE
MODEL 4SCC-TTM-X CONVERTER
MODEL 4683-TTM-XF REPEATER
SYSTEM CONNECTIONS
The station configuration drawing of Figure 4 is for general illustration purposes only. Johnson Controls
system customers should instead refer to the Metasys® Network Technical Manual for N2 Bus
Communication, or the MS/TP Communication Bus Technical Bulletin for wiring connections using the
4683-TTM-xF repeater.
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