Chapter 4 – Special Features
37
Units with RS-232 disabled (EØ) will not respond to any commands, except E1;
however, characters are still echoed to the next device in the daisy chain.
Commands:
3_E0 ; Disable RS-232 on unit #3
DRES25000 ; Set resolution to 25000 on all other units
3_E1 ; Enable RS-232 on unit #3
3_DRES4000 ; Set resolution to 4000 on unit #3
Verify communication to all units by using the techniques described above.
Step 3
Now that you have verified that the daisy chain is set up properly, you can use the
various Pocket Motion Planner and Motion Planner tools to configure and monitor
all units on the daisy chain.
RS-485 Communications
Pin Out for 4-Wire RS-485 Communications:
Pin Description
1 Rx+ (also called RD B)
4 Tx+ (also called TD B)
5 GND (logic ground)
7 Rx- (also called RD A)
8 Tx- (also called TD A)
• Maximum RS-485 cable length is 4000 feet (1220 meters)
• To establish unique addresses for multi-drop units, use the ADDR command.
• Keep wires as short as possible. Termination resistors may be required on long
cable runs.
• Connect RS-485 cables before applying power to the drive.
• Recommended cable: Belden 9842
• Refer to the diagram below for connection information.
RS-232/485
connector
Long cable runs may
require termination resistors
Master Unit
Tx+
Tx-
Rx+
Rx-
120 Ω
120 Ω
Shield
Unit #1
Unit #2
Unit #3
Unit #31
+5VDC
Ground
Pin 1 (Rx+)
Pin 7 (Rx-)
Pin 4 (Tx+)
Pin 8 (Tx-)
Pin 5 (GND)
Pin 1 (Rx+)
Pin 7 (Rx-)
Pin 4 (Tx+)
Pin 8 (Tx-)
Pin 5 (GND)
Pin 1 (Rx+)
Pin 7 (Rx-)
Pin 4 (Tx+)
Pin 8 (Tx-)
Pin 5 (GND)
Pin 1 (Rx+)
Pin 7 (Rx-)
Pin 4 (Tx+)
Pin 8 (Tx-)
Pin 5 (GND)
RS-485 Multi-drop Connections
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