6RL SERIES OPERATION MANUAL
SECTION 7: REMOTE PROGRAMMING
Entire Contents Copyright
2018 by Adaptive Power Systems, Inc. (APS) • All Rights Reserved • No reproduction without written authorization from APS.
6RL Series Regenerative DC Load Operation Manual
Page 117 of 204
7.3.1
Supported Protocols by Interface Module
The overview below show which interface module can use which protocol:
Interface
ModBus RTU?
SCPI?
Other protocol
CAN
modified
no
no
CAN
CANopen
no
no
CANopen
CANopen
RS232
yes
ModBus protocol
yes
SCPI command language
No
Profibus
no
No
Profibus
Profibus & Profinet
Ethernet
yes
ModBus protocol
yes
SCPI command language
No
ProfiNet
No
No
Profibus
Profibus & Profinet
ModBus TCP
yes
ModBus protocol
yes
SCPI command language
ModBus TCP
EtherCAT
No
no
EtherCAT
EtherCAT
Table 7-1: Interface Modules supported Protocols
7.3.2
Remote Control Characteristics
When using remote control via digital interface, some things must be taken into account:
Configuration or control of the function generator (where available) requires a
certain procedure. This is described for ModBus and for SCPI in each respective
manual section. The described procedure for ModBus also applies to any other
protocol used by buses like CAN, CANopen, EtherCAT etc.
Some ModBus registers resp. SCPI commands are intended for the setup of the unit
same as when doing so manually in the unit setup menu. Those registers/commands
are not particularly grouped or marked and should only be used to switch between
configurations of the unit.
The adjustment limits (“Limits“), as adjustable in the unit’s setup menu, limit related
set values from every control location, i.e. also in remote control via digital
interface. This can lead to unexpected communication errors coming from the unit
when a value is too high/low. With SCPI language use, these errors are not returned
automatically, because it is typical with SCPI to receive error messages only upon
request. In order to be sure whether a set value has been accepted by the unit or
not, reading back the set value is the only way to be sure it was accepted.
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