Installation, Operation and Diagnostics
for your
Communication Interface Unit
MIU(Dial or Lease Line modem with) / 485 (RS485) ~
See MIUXXX for modem Technical Data
Edition: June 17, 2003
P/N: 0049-0002-010 rev A
1. PRODUCT OVERVIEW
The CIU (MIU\XXX485) is an industrial modem with an RS-232 to RS485 converter module for
direct connection to industrial RS485 Interface units. Though similar to commercial modems, the
MIUXXX\485 contains special features that make it particularly well suited for industrial
applications. (MIUXXX is for any dial or lease line modems such as MIU14.4L)
These capabilities include:
The CIU has been designed explicitly for use in industrial environments.
In addition to an extended temperature range (-40 to +85o C), the
MIUXXX\485 includes surge, shock, vibration, and safety parameters
superior to those of conventional commercial modems.
Environment
The CIU uses standard industrial connectors for RS485 data and RS232
Industrial
interfaces.
These connectors allow reliable interconnect to other
industrial components. Furthermore, the CIU data lines are provided at
RS-232 and RS485 signal levels for both stand-alone and embedded
applications.
2. PRODUCT DESCRIPTION
The CIU provides Dial telephone communication capabilities for the industrial
environment. It can be operated stand-alone or as a component of a larger industrial
system.
2.1 Telephone Interface
The CIU telephone interface operates over two wire lines available in North America. The
telephone line interface is environmentally benign, allowing use in Class I, Division 2
applications.
2.2 Data Interface
The CIU data interface provides RS-232 compatible serial signaling. The data interface
interconnects to industrial controllers at RS-232E, RS422 or RS485 data interface are
available as options.
2.3 Power
The MIU accepts either regulated 48.0 to 220 volts DC, or regulated 48.0 to 220 volt AC
power inputs. Unregulated 12.0 to 24.0 volt DC power input is available as an option.
2.4 Mechanical
The CIU consists of two printed circuit boards: A single two sided baseboard and a
RS485 module is a single two sided package 5-3/8 x 4 x 1-3/8 suitable for desktop or wall
mounting.
2.5 Surge
The MIUXXX\485 has double the surge protection of IEC801-4 voltage
requirements.
(5KVac)
Install Op and Diags for MIU Modems and RS485 (0049-0002-010A)
Page 1 of 16
3. MIU'S LED, SWITCH & SERIAL CONNECTOR SPECIFICATIONS
The CIU/485 communicates with industrial controllers through RS-485 compatible serial
signaling. The RS-485 signal levels are used to interconnect with RS-485 compatible
embedded controllers. The RS-232E signal levels are used to configure the CIU. The RS-
232E signal levels are also used to interconnect with RS-232E compatible embedded
controllers if required.
The RS-232E is present on DB9(MIU), RS485 signal levels are available via four pins'
connectors.
4.1 The following lists the CIU/485 serial interfaces. All connector definitions are
described in Appendix A
RS-232 Configuration Connector (P2)
Connector Type:
Signal Levels:
DB9, (MIU) female, straight board mounts.
RS-232
RS485 Configuration Connector (P1)
Connector Type:
Signal Levels:
4 pin terminal header with .138 spacing
RS485
3.2 MIU/485 LED
LED Blinks every 4 seconds with AC / DC power
3.3 MIU/485 LED & Switch 1 (internal)
S1-1 Closed (ON) LED Blinks with option CD (&C1 AT command) active
S1-2 Closed (ON) LED Blinks AC. DC Power ON Note select either 1 or 2
S1-3 Closed, option modem DTR select DB9 DTR
S1-4 Closed, option modem DTR select modem's CD
3.4 MIU/485 Switch S3 (external)
S3-2 Closed (ON) only for MIU/485 (J1) modem configuration or for
RS232 embedded controllers.
S3-1,-3 &-4 Open (OFF)
S3-1 Closed (ON) only for MIU/485 (P1) RS485 connector (RS485
embedded controllers)
S3-2,-3 &m-4 Open (OFF)
3.5 MIU/485 A switch (external)
SA-1 Closed (ON) RS485 received data disable TX (Driver Output Enable)
SA-2 Closed (ON) RS485 transmit data enable TX (Driver Output Enable) + 5ms
SA-3 Closed (ON) RS485 RTS enable TX (Driver Output Enable) should be
Open (OFF)
SA-4 Closed (ON) RS485 received data is disables with TXD
Install Op and Diags for MIU Modems and RS485 (0049-0002-010A)
Page 2 of 16
3.5 MIU/485 B switch (external)
SB-1 Closed (ON) RS485 Received RX & /RX DC terminated with SB-2 Closed
SB-1 Open (OFF) RS485 Received RX & /RX AC terminated with SB-2 Closed
SB- 2 Closed (ON) RS485 Received RX & /RX terminated
SB- 2 Open (OFF) RS485 Received RX & /RX high impedance (Z)
SB-3 & 4 Closed (ON)
SB-3 & 4 Open (OFF)
2- wire configuration or loopback mode
4- wire configuration
Install Op and Diags for MIU Modems and RS485 (0049-0002-010A)
Page 3 of 16
4. POWER SUPPLY SPECIFICATIONS
The MIUXXX/485 contains a low quiescent power regulator. TheMIUXXX/485 also has
a "low power" standby mode which minimizes overall power requirements when the
MIUXXX/485 is used intermittently.
The power supply is selected through the use of
a 3-pin screw - type terminal connector.
4.1 Power Supply Selection (MIU)
Power Connector P3 (MIU)
Connector Type:
3 Pin screw- type terminal
Regulated Powe r Supply Range: 48.0 to 220 Volts AC/DC.
Standby Supply Currents:
Active Supply Currents:
In-Rush Current:
200uA
8mA to 40mA plus modem current
< 250mA
Reverse Protection Method:
Over-Voltage Clamp limits:
Full wave Bridge Rectifier
Zener diode
Regulated Power Supply Range: (12 - 24VDC) is available as an option
Standby Supply Currents:
Active Supply Currents:
In-Rush Current:
200uA
35mA to 295mA plus modem current
< 350mA
Reverse Protection Method:
Over- Voltage Clamp limits:
Full Wave Bridge Rectifier
Zener diode and TransZorb TVS
Install Op and Diags for MIU Modems and RS485 (0049-0002-010A)
Page 4 of 16
5.
RS485 SPECIFICATIONS
MIUXXXX/485 are low-power Transceiver for RS485 and RS422 communication
Features: Point to Point or Multidrop/Multipolling
Full or Half Duplex
Drivers are short - circuit current limited & protected against excessive
power
dissipation (shutdown will places the drivers in a high - impedance state).
When Drivers are disabled (by TXD), drivers will switch to high
impedance
state.
Note in two-wire or multi-drop/multi-polling networks TX enable by TXD
should be active
Receiver input impedance is 12K ohms.
Reduced slew- rate drivers that minimize EMI and reduce reflections
caused
transmitted
by improperly terminated cables
data up to 200Kbps
This will allow error - free
RS485/RS422 standard covers line lengths up to 4000 feet. For line
lengths
greater than 4000 feet a line repeater can be added.
MIUXXXX/485 can drive 4000 feet of 26AWG twisted - pair cable at
200k bps into 120 ohms load.
To minimize reflections, the line should be terminated at both ends. In
multi - polling/multi - drop environments (up to 32 drops) all drops off
main cable should be as short as possible.
the
Only the Master/Host unit and the end of cable unit should be terminated.
Typical Speed versus Distance - (4-wire point to point 26 AWG twisted
cable)
SPEED
1200bps
DISTANCE
6.0 miles(9.6 km)
4.5 miles (7.2 km)
4.0 miles (5.5 km)
2.5 miles (4.0 km)
1.8 miles (2.9 km)
1.4 miles (2.1 km)
1.1 miles (1.8 km)
0.6 miles (0.9 km)
2400 bps
4800 bps
9600 bps
19,200 bps
38,400 bps
56,400 bps
115,000 bps
NOTE: Speed and distances will depend on actual operating
environment.
6. ENVIRONMENTAL SPECIFICATIONS
The CIU/485 (MIUXXX\485) meets the following environmental specifications.
Install Op and Diags for MIU Modems and RS485 (0049-0002-010A)
Page 5 of 16
Operating Temperatures
Storage Temperature
Relative Humidity
Altitude
-40 to 85oC
-55 to 100oC
0 to 95% is non-condensing.
20,000 ft (operating), 40,000 ft (shipping).
Vibration Effect
Withstand 10 to 500 Hz at 1 g on any axis per SAMA
PMC-31-1 without damage or impairment.
ESD susceptibility
EMI susceptibility
EMI radiation
Field connected circuits meet the requirements of IEC
801-2 for ESD withstand capability up to 10 KV.
Withstand 27 to 1000 MHz per IEC 801-3 level 1 (1v/m)
without damage or impairment.
Meets FCC Rules Part J, Subpart 15, Class A for
radiated emissions.
7. APPROVALS
The CIU/485 meets the following approvals:
Telephone:
Emissions
FCC Part 68
FCC Part 15
Environment
UL listed (pending) for use in Class I, Division 2,
Groups C and D hazardous locations.
Install Op and Diags for MIU Modems and RS485 (0049-0002-010A)
Page 6 of 16
MIUXXX\485 Power Connection
Power Connector
RJ11 Leased Line Port
Power In MIU (48 to 220VAC/DC
(AC or DC)
non-polarized
Earth Gnd
Power In MIU-LV (9 to 36VDC)
Positive Voltage In
Power Ground
Earth Gnd
LED 1
Earth/Digital Ground (Jump pins if req’d)
DB9 Data Port
LED ONE
Blinking = POWER ON
Steady = MODEM CONNECTED (CD)
¨
CIU Installation, Operation & Diagnostics
Edition: June 17, 2003
SHEET TWO
RJ11 Telco Port *
Power Connector
(* Not on MIU232/485 Converter)
B A
LED 1 *
Earth/Digital Ground (Jump pins if req’d) *
RS485
Connection
RS232 Data Port (DB9 female)
for modem configuration only.
TX+ TX- RX+ RX-
3 & 4 always UP.
1 UP, 2 DOWN when using DB9
for modem configuration.
1 DOWN, 2 UP ~ Modem
connected to RS485. Do not
connect data to DB9
LED 1...
¨ Blinking = POWER ON
¨ Steady = MODEM CONNECTED (CD)
B
Point-to-Point, 4-Wire: Set Switches B-3 & B-4 DOWN(OFF)
Point-to-Point, 2-Wire: Set Switches B-3 & B-4 UP(ON)
Line Terminate DC : Set Switches B-1 & B-2 UP(ON)
A
Line Terminate AC : set Switches B-2
UP(ON)
4 3 2 1
4 3 2
1
For LoopBack Test mode : Set Switches B-3 & B-4 UP(ON)
Set Switch A-4 DOWN(OFF)
B
A
Multi-drop (Host), 4-Wire: Set Switches B-3 & B-4 DOWN
Multi-drop (Host), 2-Wire: Set Switches B-3 & B-4 UP
4 3 2 1
4 3 2 1
Multi-drop (Slave), 4-Wire: Set Switches B-3 & B-4 DOWN
Multi-drop (Slave), 2-Wire: Set Switches B-3 & B-4 UP
Line Terminate
: Set Switches B-2 & B-1DOWN (OFF) for
all Slaves except UP(ON) on unit furthest
from the Host
A
B
Switch A-1:
Switch A-2:
Switch A-3:
RTS/CTS Delay: UP = 0 sec; DOWN = 7ms
DOWN = TXD enables TX +5ms
DOWN = RTS enables TX
Select only A-2 or
A-3
4 3 2 1
4 3 2 1
Switch A-4: UP(ON) = TX clamps RXD off (ON) in 2-Wire (half duplex) mode
MIUXXX/485 DIP SWITCH SETUP
CIU Installation, Operation & Diagnostics
Edition: June 17, 2003
SHEET TWO
CONNECTOR PIN DEFINITIONS
APPENDIX A.
CONNECTOR
P2: RS-232 Configuration Connector (DB9) MIU
DCD
RD
TD
DTR
GND
DSR
RTS
CTS
RI
1
2
3
4
5
data carrier detect
receive data
transmit data
data terminal ready
ground
from MIUXXX\485
from MIUXXX\485
MIUXXX\485
MIUXXX\485
to
to
6
data set ready
from MIUXXX\485
to MIUXXX\485
from MIUXXX\485
from MIUXXX\485
7
8
9
request to send
clear to send
ring indication
protective ground
PGND
shield
_______________________________________________________________________________
P1: RS-485 Configuration Connector 4 Positions header with .138
CONNECTOR
spacing
Interface to 4 positions Plug-in Terminal Block
TXY
TXZ
RX
1
transmit data (+)
from MIUXXX\485 module
from MIUXXX\485 module
to MIUXXX\485 module
to MIUXXX/485 module
2
transmit data (-)
3
4
receive data (+)
receive data (-)
/RX
MIUXXX/485 Installation, Operation & Diagnostics Edition: June 17, 2003
Page A-1
APPENDIX B. SETUP CONFIGURATION
In order to configure the MIUXXX/485 to remote RTU, Meter or Scada terminals the
following setup is required for 2w or 4w (RS485) networks
See Fig ONE for MIUXXXX/485 layout and dip switch setting
Jumper 7
Pin 1
3&4
Power
Plug
Switch
Three
RJ11
Telco
Switch Three Setting
SW - One On
SW - Two Off
SW - Three Off
SW - Four Off
DB9 (RS232)
Configuration
only
DB 9 Connection
1 Carrier Detect
2 Received Data
3 Transmit Data
4 DTR
Switch
One
Switch One Setting
5 Signal Ground
6 DSR
7 RTS
8 CTS
J2 Pin1
J 8
Pin 1
2 & 3
SW - One Off
SW - Two On
SW - Three Off
SW - Four Off
Jumper
3 & 4
5 & 6
7 & 8
13 & 15
9 Ring Indicator
Final Factory Configuration (MIUXXXX/485) for PEXXX modem module
No, Power saving modes, No Auto Reset mode
Switch two ON Switch one, three and four are OFF.
MIU S3 (external)
SW-2 Closed (ON) MIU is configured for DB9 interface to
Modem interface connection.
SW-1, -3 & -4 Open (OFF)
CIU Installation, Operation & Diagnostics
Edition: June 17, 2003
Page C-1
1:AT Command (MIU2400/485) (Dial) configuration is:
ATE0Q1&C1&D0S0=1&W0
E0
Q1
Echo Command disables (no "AT" response to terminal)
Result Codes disable (no result codes return to terminal ring)
S0=1 Auto Answer active (first ring modem will go OFF- Hook and
start answer sequence)
&C1 Carrier Detect is always True (MIU LED will be ON all the
time when Carrier Detect is ON.
&D0 DTR is ignored
2:
AT Command (MIU2496/485, MIU14.4/485 & MIU28.8/485)
ATE0Q1&C1&D0&Q6S0=1&W0
E0
Q1
Echo Command disables (no "AT" response to terminal)
Result Codes disable (no result codes return to terminal ring,
Connect XXX)
&Q6 Normal mode (speed buffering)
S0=1 Auto Answer active (first ring modem will go
and start answer sequence)
OFF- Hook
&C1 Carrier Detect is always True (MIU LED will be ON all the
time when Carrier Detect is ON.
&D0 DTR is ignored
&K0 No flow control
3:
AT Command (MIU14.4L/485) Lease Line
ATE0Q1&C1&D0&K0&Q6\M0\H1&Z3=XX&W0
Recycle power (OFF ON)
Wait 5 seconds for DSR to switch ON
Enter AT\S1 <CR>
AT&W0 <CR>
Within 45 seconds
E0
Q1
Echo Command disables (no "AT" response to terminal)
Result Codes disable (no result codes return to terminal ring,
Connect XXX)
&Q6 Normal mode (speed buffering)
\M0 Answer mode (for Remote (Slave unit) local (Master) set for
originate \M1
\H1
Lease Line mode
\S1
Security mode (if remote RTU is a dumb unit - TxD is always ON
CIU Installation, Operation & Diagnostics
Edition: June 17, 2003
Page C-1
&Z3=XX Password to exit security mode
&C1 Carrier Detect is always True (MIU LED will be ON all the time
when Carrier Detect is ON.
&D0 DTR is ignored
&K0 No flow control
4:
AT Command (MIU9.6L/485) Lease Line
ATE0Q1&C1&D0&K0&Q6\M0\H1W0
E0
Q1
Echo Command disables (no "AT" response to terminal)
Result Codes disable (no result codes return to terminal ring,
Connect (XXX)
&Q6 Normal mode (speed buffering)
\M0 Answer mode (for Remote (Slave)unit) local (Master) set for
originate \M1
\H1
\S1
Lease Line mode
Security mode (Not available for MIU9.6L)
&C1 Carrier Detect is always true (MIU LED will be ON all the time when
Carrier Detect is ON.
&D0 DTR is ignored
&K0 No flow control
Note &Q5 error detection and data compression can be used
If the host software will support EC
Switch Setting (MIUXXX/485) (Typical)
MIU S3 (external)
SW-1 Closed (ON) MIU is configured for RS485 Module (RS485 RxD
(Output) to Modem TxD (input))
SW-2, -3 & -4 Open (OFF)
2- Wire Configuration on PE485 module
SB-1 Closed (ON) DC Termination Open (OFF) AC Termination
SB-2 Closed (ON) Line Termination
SB-3 & -4 Closed (ON) 2- Wire
SA- 1 Open (OFF)
SA- 2 Closed (ON) TxD (transmit data) enables TX (Driver Output Enable) + 5ms
SA- 3 Open (OFF)
SA- 4 Closed (ON) Received data is disable with TX
enable (TxD)
4- Wire Configuration for PE485 module
CIU Installation, Operation & Diagnostics
Edition: June 17, 2003
Page C-1
SB-1
SB-2
Closed(ON) DC Terminated
Closed (ON) Line Termination
SB-3 & -4 Open (OFF) 4- wire
SA-1 Open (OFF) RTS follows CTS no delay
SA-2
SA-3
Open (OFF)
Closed (ON) RTS (always ON by MIU internal J7 (1/2)
setting) enables TxEN)
SA-4
Open (OFF) TxD will not disable RxD
MIU S3 (external)
SW-1 Closed (ON) MIU is configured for RS485 Module (RS485 RxD
(Output) to Modem TxD (input))
SW-2, -3 & -4 Open (OFF)
SA2 & SA3 can be configures for TxD enable TxEn signal if there
are several master locations in the network.
SA2 is Closed (ON) TxD (transmit data) enables TX (Driver Output
+ 5ms
Enable)
SA3 is Open (OFF) TxD will not disable RxD
MIUXXXX/485 Final Connection
Ensure that MIUXXXX/485 J7 (internaljumper) 1/2 is connected
CONNECTOR DIAGOSTICS
CONNECTION FAILURE
APPENDIX C.
RS485
CIU Installation, Operation & Diagnostics
Edition: June 17, 2003
Page C-1
To test RS485 module set switch SB-3 & -4 Closed (ON) to loopback data to the host
modem. This test is for RS485 2- wire and 4- wire configurations.
Connect MIUXXXX/485 TXY (+) and TXZ (-) to the embedded controller
RS485
DIAGNOSTICS
RS485 CONNECTION FAILURE
To test RS485 module set switch SB-3 & -4 Closed (ON) to loopback data to the host
modem. This test is for RS485 2- wire and 4- wire configurations.
Connect MIUXXXX/485 TXY (+) and TXZ (-) to the embedded
controller RS485 connection
MIUXXXX/485 + ------------------- + RS485 embedded controller
- ------------------- -
In some applications RS485 TXY (+) and TXZ (-) may have to be connected
to RS485
embedded controller in the following setup
MIUXXX/485 + ----------------- - RS485 embedded controller
- ----------------- +
CIU Installation, Operation & Diagnostics
Edition: June 17, 2003
Page C-1
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