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2. Installation
2.6 Setting up the RS485 link
General
For UPSs equipped with the PowerServices TelPac external version (see table section 2.3 "The various installation
types"), communication between the UPS and the external unit is achieved via a RS485 link in 2-wire mode.
The link works using the master-slave mode, with the PowerServices TelPac always being the master.
Standard practice is to add line bias at the network master and impedance matching at the end of the line on the slave
side.
The line must only be biased at one point.
"Single-unit" type installation
The external unit is pre-configured to be directly operational. No special configuration is necessary for a "Single-unit" type
installation of the external unit with a Galaxy or Comet type UPS.
Configuration of communication parameters (mode, rate, etc.) is carried out on the RS485 cards on the respective UPSs
(see "Configuring the RS485 card for Comet" or "Configuring the RAUZ card for Galaxy").
Page 18 -
34003602EN/AB
All manuals and user guides at all-guides.com
UPS with JBUS/
RS485 card
Slave number x
fault
Without bias
With impedance matching
1200,8,N,1
PowerServices
Telpac
Master
With bias
Without impedance matching
1200,8,N,1
The RS485 shielded 2-wire link
JBUS / RS485
Phone
Settings
A 5V B R+ R- T+ T-
CD
UPS
PowerServices TelPac
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