Omega Engineering CN8240, CN8260 manual Option -C4 RS-485 one-to-many Communications

CN8240 & CN8260 Series Communications & Options

RS-485

Communications

Option -C4: RS-485 (one-to-many) Communications

RCV	XMT	SIG GND	RS	232
B(-)	A(+)	SIG GND		485

1		1
		1
2	23	24 12
3		13
4		14

JMP 1

Option Description: Provides one-to-many communications.

Terminate the controller furthest from the computer by either connecting a 120-ohm, 1/4-watt resistor between ter- minals 23 and 24 or using jumper 1 located on the underside of the communications board as shown above.

Transducer

Power Supply

Options -XP1, -XP2, -XP3, -XP4: Transducer Power Supply

3		13
4		14
5		15
6		16
7		17
8		18
9	21	19	–	–	MA
		22	T/C	RTD	MV
1		2			V
0		0	+	+
			NOTE: FOR 2 WIRE RTD
				JUMPER 18 & 20

0 to1 volt out = 0 to100% RH

(6 to 30 Vdc input)

Option Description: The transducer power supply option provides power to remote transducers. The transducer outputs, in turn, provide a signal to the controller input which can be scaled in the appropriate engineering units.

Option -XP1: 15 Vdc

Option -XP2: 12 Vdc

Option -XP3: 10 Vdc

Option -XP4: 5 Vdc

All options will provide at least 20 mA. The transducer circuitry is thermally protected from short circuits.

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