KEYENCE N-48/42 - Manual (Page 13)

13
■ N-48
To connect the BL series in RS-485 multi-drop
link mode through the N-48, the N-400 multi-drop
unit must be used as the master unit.
For the multi-drop link connecting and operating
procedures, see the N-400 User’s Manual.
The pin assignments for the N-48 and RS-485
equipment are as follows.
CONNECTING THE COMMUNICATION INTERFACE
24V DC OUT 24V DC IN RS-485A RS-485
+ + – –
SG SG + + – –
* Up to thirty-one N-48 (BL series) units can be
connected in multi-drop link mode.
* The RS-485 cable’s total extension distance
must be within 1.2 km.
* Turn ON the terminator of the equipment at
both ends of the RS-485 connection (termina-
tion resister: 100
Ω ) .
Code Description Signal direction
SG Ground –
RS-485+ Sends/receives data to/ Input/Output
from + terminal.
RS-485– Sends/receives data to/ Input/Output
from - terminal.