This document provides installation instructions for an IU-9100 interface unit and RP-9100 repeater. It contains warnings about safety and authorized personnel. It describes wiring the units according to codes, using ferrules on stranded wire. The IU-9100 converts RS-232 to RS-485 and the RP-9100 repeats the RS-485 signal for lines with more than 31 instruments. Connection diagrams show setting jumpers and adding line termination resistors for different configurations up to 32 units.

1. P/N 24-85481-102 Rev. E
INSTALLATION INSTRUCTIONS
INSTALLING IU-9100-810x INTERFACE UNIT AND
RP-9100-810x REPEATER
WARNING:
• The IU-9100 and RP-9100 are not equipped with a power supply switch. Therefore an additional switch to isolate the device
should be included in the power supply wiring to the IU-9100 and RP-9100.
• To prevent from electrical shock or damage to equipment, the utmost care should be taken when the cover is removed (authorized
personnel only) for adjustments or check out.
• In all other cases when the cover is removed, the power should be switched off.
• These Controls are designed for use only as operating Controls. When an operating control failure would result in personal injury
or loss of property, it is the responsibility of the installer to add devices or systems that protect against, or warn of, control failure.
WIRING:
• Make sure that the line power supply is in accordance with the power supply specified on the device.
• All wiring should conform to local codes and must be carried out by authorized personnel only.
• When using multi-stranded wire apply a cable ferrule to the cable end.
IU-9100 INTERFACE UNIT
• Converts RS-232 signal (from PC) into an electric one requested by System 91 Instrument which use standard RS-485.
RP-9100 REPEATER
• Repeates and regenerates the RS-485 signal when more than 31 Instruments have to be connected on the same line.
• Can be used to branch the communication bus
TECHNICAL CHARACTERISTICS
Power Supply: 24 V, 110 V and 230 V ; 50-60 Hz
Transmissions: 4800, 9600 and 19200 Baud
Bidirectional data transmission:
Max. cable shielded length from IU to PC: 10 m (1,5 m Fact. suppl. for IU-9100)
Automatic supervision of serial line:
Max. instruments in line: 32 including IU-9100 / RP-9100
Max. common mode rejection: 1500 VRMS 50 Hz 1 minute
Transformer: VDE norms
Power consumption: 3 VA
Ambient operating limits: 0 to +55 °C / +32° to +131 °F
Relative humidity: 10 to 90 % RH, non condensing
Ambient storage limits: -25 ° to +70 °C / -77 ° to +158 °F
Weight: 0,5 kg
Box material: ABS / Polycarb. self-extinguishing
Protection: IP 30
Approvals: EN 60950
CABLE
GLAND
PG9
Ø MIN 4,5 mm
Ø MAX 7 mm
RS-232
Output
RS-485
Hot
Ground
Neutral
RT +
RT -
Comm.
IU-9100-810x Interface
W2
1 2 3
W1
3
2
1
Input
Output
Hot
Ground
Neutral
RT +
RT -
Comm.
RP-9100-810x Repeater
W2
1 2 3
RT +
RT -
Comm.
Inserted
(factory)
Not
Inserted
W1 W1
W2 W2
Jumpers W1 and W2
are for resistor 220 Ω
line terminal
3
2
1
1 2 3
3
2
1
1 2 3
Table 1: F1 Fuse Value
Model F1 Fuse Value
IU-9100-8101, 230 V F 200 mA 250 V
IU-9100-8103, 110 V F 400 mA 250 V
IU-9100-8104, 24 V F 1 A 250 V
RP-9100-8101, 230
V
F 200 mA 250 V
RP-9100-8103, 110
V
F 400 mA 250 V
CABLE
GLAND
PG9
Ø MIN 4,5 mm
Ø MAX 7 mm

2. P/N 24-85481-102 Rev. E
INSTALLATION INSTRUCTIONS
RS485 BUS CONNECTION UP TO 32 UNITS
IMPORTANT:
Terminate the line with resistor 220 Ω on both lines end. Change Jumper W2 position inside the IU-9100 to disconnect line resistor.
RS485 BUS CONNECTION WITH MORE THAN 32 UNITS
IMPORTANT:
Jumpers W1 and W2 for 220 Ω resistor line terminal are already factory positioned on the repeater RP-9100. The 220 Ω resistor of
line termination is the optimal value verified with IU-9100 / RP-9100 line length for general applications. If the resistor terminal has to be
optimized with line impedance, position Jumpers W1 and W2 in position of disinserted resistor and apply preferred resistor value.
CONNECTION TABLES IU-9100 INTERFACE TO PC AND SYSTEM 91 CONTROLLERS
RS-485 line maximum length without repeaters: 1200 meters
RS-232C line maximum length: 10 meters
RT+
RT-
COM
RP-9100
RX
TX
Com 0
IU-9100
Personal Computer
Com 0
TO
RS 485
RS 232
RX
TX
CD
RX
TX
DTR
RI
S.GND
DSR
RTS
CTS
6
5
3
1
1
2
3
4
9
5
6
7
8
shield
S.GND
RX
TX
9 Poles
IU-9100
9 Poles
PC AT
+ - c
+ - c
+ - c
220 Ω Resistor for bus
line termination
IU-9100
1
32 max.
COM
RT +
RT -
2
+ - c
+ - c
+ - c
IU-9100
1 31
COM
RT +
RT -
2
+ - c
1
COM
RT +
RT -
32 max
220 Ω Resistor for bus
line termination
PC/IU 9100 CONNECTION WIRING DIAGRAMS
PC/IU CABLE

3. P/N 24-85481-102 Rev. E
INSTALLATION INSTRUCTIONS
Max. quantity of instruments in line: 32 incl. IU-9100 / RP-9100