Elpro Technologies 905U-D User Manual download pdf (Page 15)

Chapter Two Installation

Page 15 © January 2011

2.3 Power Supply

The 905U-D module is powered by a 10 - 30VDC or 13 – 24VAC supply. The power supply

should be rated at 1 Amp and be CSA

Certified Class 2.

For DC supplies, the negative side of the

supply is connected to "COM" and may be

connected to “ground”. The supply negative

is connected to the “GND” terminal internally.

The positive side of the supply must not be

connected to earth. The DC supply may be a

floating supply or negatively grounded.

The power requirements of the 905U-D units

is 80mA at 12VDC or 50mA at 24VDC. The

power requirements in low power mode is

20mA at 12VDC.

2.4 Serial Connections

2.4.1 RS232 Serial Port

The serial port is a 9 pin DB9 female and provides for connection to a host device as well as a

PC terminal for configuration, field testing and for factory testing. This port is internally shared

with the RS485 - ensure that the RS485 is disconnected before attempting to use the RS232 port.

Communication is via standard RS232 signals. The 905U-D is configured as DCE equipment

with the pinout detailed below.

905U-D

DB9

MALE

DTE HOST

DB9

FEMALE

905U-D

DB9

MALE

DCE HOST

DB9

MALE

Hardware handshaking using the CTS/RTS lines is provided. The CTS/RTS lines may be used to

reflect the status of the local unit’s input buffer, or may be configured to reflect the status of

CTS/RTS lines at the remote site. The 905U-D does not support XON/XOFF.

905U-D

10 – 30 +

VDC -

905U-D

13 - 24

VAC

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 60 61

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Elpro Technologies 905U-D User Manual Page 15

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