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DD1050
3.5.3 RS232 connections
CAUTION
Maximum use conditions envisaged by standard RS232:
Maximum transmission distance: 15 m
Maximum voltage at ends: ± 12 Vdc
It is advisable to use a screened cable for connections to external devices. Remember to connect
the screen to the metal part of the shell of the 9-pin connector.
3.5.4 RS422 connections
If the COM2 serial port is configured with the RS422 standard, you must:
• Make a bridge connection between pin 6 and pin 8 so as to connect the termination
resistance.
CAUTION
Limits to use envisaged for standard RS422:
Maximum transmission distance: 1200 m
Maximum voltage at ends: +/- 7V
It is advisable to use a screened cable of the "twisted pair" type for connections to external
devices. Remember to connect the screen to the metal part of the shell of the 9-pin connector.
3.5.5 RS485 connections
If the COM2 serial port is configured with the RS485 standard, you must:
• Connect pins 9 and 6 (DATA +) and pins 1 and 7 (DATA -) together (chap. 3.5.1 on page 25).
• Make a bridge connection between pin 6 and pin 8 so as to connect the termination resistance.
This operation must be carried out on the first and last device connected together.
CAUTION
Limits to use envisaged for standard RS485:
Maximum transmission distance = 1200 m
Maximum voltage at ends = ± 7V
It is advisable to use a screened cable of the "twisted pair" type for connections to external
devices. Remember to connect the screen to the metal part of the shell of the 9-pin connector.
Maximum number of terminals that can be connected = 16
Summary of Contents for DD1050
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