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Service Manual
ISTAT I4X
8.
CONNECTION MODES
8.1
EIA (RS)232 to EIA (RS)485
There are three groups of terminals on the I4X; the auxiliary voltage, the RS232 port and the
RS485 port. These are shown in the table below:
I4X
Screw
Terminals
The maximum cable length between the I4X and the RS232 device is 3 meters.
The maximum number of devices that can be supported using RS485 communications is 32.
The line should be terminated by a 120 ohm resistor.
8.2
Ethernet to EIA (RS)232
There are three groups of terminals on the I4X; the auxiliary voltage, the Ethernet port and
the RS232 port. These are shown in the table below:
I4X
Terminals
The maximum cable length between the I4X and the RS232 device is 3 meters.
8.3
Ethernet to EIA (RS)485
There are three groups of terminals on the I4X; the auxiliary voltage, the Ethernet port and
the RS485 port. These are shown in the table below:
I4X
Terminals
The maximum number of devices that can be supported using RS485 communications is 32.
The line should be terminated by a 120 ohm resistor.
8.4
Status Indication: Power
On each I4X there is a single Power LED that indicates when there is an auxiliary supply
connected. The I4X uses a universal ac/dc power supply that can operate between 24 to
300V DC and 40 to 276V AC. The frequency range of the power supply is 40 to 70Hz.
Auxiliary supply
RS232
port
13 + ∼ , 14 – ∼
(TX) 26
(RX) 24
(GND) 25
Auxiliary supply
Ethernet
port
13 + ∼ , 14 – ∼
10/100 RJ45
socket
Auxiliary supply
Ethernet
port
13 + ∼ , 14 – ∼
10/100 RJ45
socket
I4X/EN CO/D
Page 12
RS485
Output device
port
(A) 21
DATA +
(B) 23
DATA -
RS232
Output device
port
(TX) 26
(TX)
(RX) 24
(RX)
(GND) 25
(GND)
RS485
Output device
port
(A) 21
DATA +
(B) 23
DATA -
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