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D70E
3.4.3 Connection of serial port in RS485 configuration
If the serial port is configured for RS485 data transmission, you will need to:
✔
connect together pins 9 and 6 and pins 1 and 7 (Figure 3.7)
✔
place a jumper across pin 6 and pin 8 to connect the termination
resistance; this operation is to be carried out on the first and last
terminals connected in the line.
Key
NC = Reserved - do not connect
DATA +/- = Bidirectional data
transmission line
TERMIN = Termination resistance
to be connected to pin 6
Ri = Termination resistance inside
terminal
NOTE: the free pins are reserved
for RS232 connection
Figure 3.7 - Pinout for RS485 serial port connection (log0006.gif)
CAUTION
Operating limits stipulated by the standard RS485:
Maximum transmission distance = 1200 m
Maximum line voltage = +/- 7V
For connection to external devices, use a screened twisted
pair cable and connect the screen to the metal cap of the
Summary of Contents for D70E
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Page 29: ...1 29 D70E 9 pin connector Maximum number of terminals that may be connected 16 ...
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