Communication With A Slave Controller - Newport New Focus Picomotor 8743-CL User Manual

"SD?" command. Once the scan is completed, the master controller can be queried to find
out the addresses of all the slave controllers.
NOTE: The Picomotor Windows software application (version 2.0 and above)
provides the quickest and easiest path to controller address configuration. The user
friendly software will automatically report any RS-485 address conflicts found and
offer easy resolution options.
The Remote Command Set chapter provides a detailed description of the commands used
to setup the RS-485 network.
The 8743-CL provides various commands to help setup the RS-485 network. (See below)
5.5.2

Communication with a Slave Controller

All the commands intended for a slave controller connected via RS-485 LAN must have a
slave controller address prefix added to the command. For example, to query the motion
status of motor 2 on a slave controller with address 3, the host PC must send "3>2MD?"
command to the master controller via Ethernet or USB. In this command, "3>" is the
slave controller address prefix. This prefix tells the master controller that the command
"2MD?" is intended for slave controller with address 3 on the RS-485 LAN.
When the master controller sends a response back to host PC, it too will have a slave
controller address prefix. This is used to inform the host that the response came from a
slave controller with that address. For example, the response received by a host PC to the
above mentioned command might be "3>1". This indicates that the motion of motor #2 in
slave controller with address 3 is complete.
NOTE: RS-485 LAN transmission speed is 115 Kbit/s (~100 µs/character)
If a command does not have controller address prefix, the master controller will assume
that the command is addressed it and process the same.
NOTE: The host PC is effectively the 'master' in the special case of direct LAN
connection via RS485-to-RS232 adapter/converter configuration
COMMAND DESCRIPTION
SA
Set controller address
SA? Controller address query
SC Initiate scan process
SC? Scan result query
SD?
Scan status query
Table 3 RS-485 LAN Related Commands
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