Chromalox 1604 User Manual download pdf (Page 10)

7

VOLTAGE OUTPUTS FOR SSR DRIVE

Fig. 11 SSR DRIVE OUTPUT WIRING

It is a time proportioning output.

Logic level 0: Vout < 0.5 V DC.

Logic level 1:

- 14 V

+ 20 % @ 20 mA

- 24 V

+ 20 % @ 1 mA.

Maximum current = 20 mA.

NOTE: This output is not isolated. A double or

reinforced isolation between instrument output

and power supply must be assured by the

external solid state relay.

SERIAL INTERFACE

RS-485 interface allows to connect up to 30

devices with one remote master unit.

Fig. 12 - RS-485 WIRING

The cable length must not exceed 1.5 km at 9600

BAUD.

NOTE: 1) This is an RS485 isolated interface.

2)The following report describes the

signal sense of the voltage appearing

across the interconnection cable as

defined by EIA for RS-485.

a) The ” A ” terminal of the generator shall

be negative with respect to the ” B ”

terminal for a binary 1 (MARK or OFF)

state.

b) The ” A ” terminal of the generator shall

be positive with respect to the ” B ”

terminal for a binary 0 (SPACE or ON)

12

13

COMMON

11

B'/B

B/B'

A/A'

A'/A

M

A

S

T

E

R

I

N

S

T

R

U

M

E

N

T

+

_

_

+

6

7

OUT 1

SOLID STATE

RELAY

1604-1-BC.p65 5/16/00, 10:25 AM7

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 39 40

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