User guide
82
6250 Servo Controller User Guide
RS-232C Daisy-Chaining
Up to eight 6250s may be daisy-chained. There are two methods of daisy-chaining: one uses
a computer or terminal as the controller in the chain; the other uses a 6250 as the master
controller. The figure below illustrates examples of both daisy-chain types for three 6250s.
Be sure to use the Rx, Tx and GND on the AUX connector, not the RP240 connector.
Rx
Tx
GND
6250
Tx
Rx
GND
Rx
Tx
GND
6250
Rx
Tx
GND
6250
Unit Ø Unit 1 Unit 2
Rx
Tx
GND
6250
Rx
Tx
GND
6250
Rx
Tx
GND
6250
Unit Ø Unit 1 Unit 2
Daisy Chain to a Computer or Terminal Stand-alone Daisy Chain
AUX
Rx
Tx
GND
NOTE: Use Rx, Tx and GND on the 6250's
AUX connector, not
the RP240 connector.
Standard 25-Pin
COM Port Pin Outs:
Pin 2 = Transmit (Tx)
Pin 3 = Receive (Rx)
Pin 7 = Ground (GND)
Standard 9-Pin
COM Port Pin Outs:
Pin 3 = Transmit (Tx)
Pin 2 = Receive (Rx)
Pin 5 = Ground (GND)
Follow these steps to implement daisy-chaining:
Step
➀
To enable and disable communications on a particular 6250 unit in the chain, you must
establish a unique device address using the unit's address DIP switches or the Daisy-chain
Address (ADDR) command.
DIP switches: Instructions for accessing and changing these DIP switch settings are provided in
the Optional DIP Switch Settings section in Chapter 8. Device addresses set with
the DIP switches range from 0 to 7.
ADDR command: The ADDR command automatically configures unit addresses for daisy chaining by
disregarding the DIP switch setting. This command allows up to 99 units on a
daisy chain to be uniquely addressed.
Sending ADDRi to the first unit in the daisy chain sets its address to be (i). The
first unit in turn transmits ADDR(i + 1) to the next unit to set its address to (i
+ 1). This continues down the daisy chain until the last unit of (n) daisy-chained
units has its address set to (i + n).
Setting ADDR to Ø re-enables the unit's daisy-chain address configured on its
internal DIP switch.
Note that a 6250 with the default device address of zero (0) will send the initial power-up start
messages:
*NO REMOTE PANEL
*PARKER COMPUMOTOR 625Ø - 2 AXIS SERVO CONTROLLER