Xantrex GPIB-M-HPD, Operating Manual

Page: 38 / 134

Installation and Configuration
Configure for Multichannel Operation
36
Operating Manual for Multichannel Functionality (GPIB-M)
CANbus The CANbus port consists of two 4-pin modular “handset” jacks to support daisy
chain connections. The CAN (Controller Area Network) is an ISO standard
(ISO11898) for a serial communication network.
Table 2.2 describes the pin
functions. The CANbus is used for communications in multichannel operation or
current sharing (master/slave) operation.
Table 2.2 CANbus Pins
CANbus
Cables
The custom CANbus cables shipped with your unit are parallel 4-connector cables
with 4-pin modular “handset” connectors.
Configuration
of CAN-only
Interface
Cards
The CAN-only interface cards must be configured via the CANbus with another
GPIB-M card. The CAN-only interface cards are set to multichannel address 2 at the
factory. Ensure the multichannel address on the GPIB-M is set to an unused address,
for example, address 1. Connect the two power supplies as shown in
Figure 2.10,
“Connections for Multichannel Operation” on page 37 .
Send the query to the CAN-only power supply:
SYST2:REM:SOUR?
and ensure the response is “MCH” for multichannel.
If necessary, set the power supply to accept control via multichannel commands
(the CANbus interface) with the SCPI command:
SYST2:REM:SOUR MCH
Set each slave's unique multichannel address using the command:
SYST2:COMM:MCH:ADDR <multichannel-address>
where multichannel-address is an integer in the range of 1-50.
This procedure can be repeated separately with each power supply to assign a unique
address to each. Once all power supplies are configured, they can be connected to the
CANbus network.
Pin # Function
1 CANLO
2 Ground
3 CANHI
4 Ground
Note
See
“Broadcasting Commands” on page 39
for additional information on
configuring CAN-only units.