Automation Direct D0-DCM, Руководство пользователя

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Installation and Setup
Installation and
Safety Guidelines
2–4
Installation and Setup
DL05/06 Data Communications Module, 1st Edition, 08/05
The D0–DCM can support RS–232 (ports 1 and 2) or RS–422/485 (port 2)
communication. Your application and configuration choice will help determine which
electrical specification is best for you. If you are using multi-drop, you must use RS–422
or RS–485. If you are using point-to-point, you may have a choice between RS–232C
and RS–422/485.
You can use RS–232 if the cable length is less than 50 feet and if the cable will not be
subjected to induced electrical noise that is commonly found near welders, large motors,
or other devices that create large magnetic fields.
You must use RS–422/485 for all other applications. RS–422/485 allows longer cable
distances (up to 3300 feet) and provides higher noise immunity.
Although the network configuration and electrical specification are important, the type of
devices being connected to the D0–DCM are just as important. The exact cable
schematic needed really depends on a combination of all three things.
The following diagram shows the port pinouts for the D0–DCM.
D0–DCM Pinouts
Port 1
15-pin Female
HD Connector
1
5
11
15 10
6
Port 2
Port 2 Pin Descriptions
1 5V 5 VDC
2 TXD2 Transmit Data (RS–232)
3 RXD2 Receive Data (RS–232)
4 RTS2 Ready to Send (RS–232C
5 CTS2 Clear to Send (RS–232)
6 RXD2– Receive Data – (RS–422/485)
7 0V Logic Ground
8 0V Logic Ground
9 TXD2+ Transmit Data + (RS–422/485)
10 TXD2 – Transmit Data – (RS–422/485)
11 RTS2 + Request to Send + (RS–422/485)
12 RTS2 – Request to Send – (RS–422/485
13 RXD2 + Receive Data + (RS–422/485)
14 CTS2 + Clear to Send + (RS422/485)
15
CTS2 – Clear to Send – (RS–422/485)
Port 1 Pin Descriptions
1 0V
2 5V
3 RXD Receive Data (RS–232)
4 TXD Transmit Data (RS–232)
5 RTS Request to Send
6 0V
1
2
3
4
5
6
RJ12 Phone Jack
Connector
Consideration 2:
Electrical
Specification
RS232C or
RS422/485
Consideration 3:
Cable Schematics