Instruction manual
ITEM TE550
S.p.A.
80/92
13.2 -
RS-485 SERIAL INTERFACE
The RS-485 serial expansion card, code 50209, permits connecting the control unit in the
network to other welding control units and to a central personal computer for programming the
control unit or for documenting production data. The card interfaces with the control unit
through a 6-pin connector, and with the outside network, through a standard male 9-pin
connector with the following signals:
PIN 1
Ground
PIN 2
Y (TX+)
PIN 3
A (RX+)
PIN 4
R1A
PIN 5
R2A
PIN 6
Z (TX-)
PIN 7
B (RX-)
PIN 8
R1B
PIN 9
R2B
The card may be connected only when the control unit is powered-off. Moreover, it is
advisable to connect the 6-pin connector first (the one that connects the welding control unit)
followed by the RS485 connection. Then power-on the control unit and activate function
NET/485
in the
FEATURES MENU
.
During network communication, the welding control unit (slave) must be assigned with an
identifying address to be recognized by a Master, for example a Personal Computer. Even
this parameter, called NET ADDRESS, is set in the
FEATURES MENU
.
In order to manage data and communication among control units connected in the network, a
personal computer software is available, called
TECNANet
, which allows the user to: check
the network's structure (i.e. how many and which control units are connected), remotely
program each control unit and acquire & save production data.
The interface is isolated up to 1500V, without the need for any external power supply and
works as a connection with standard RS485 signals in half duplex or full duplex mode. The
male D-sub 9-pin connector has two screws with 4-40 UNC threading that also have a
threaded head. These screws will be used for wall-mounting purposes (max 3mm) and for
locking the mobile connector. The card is fitted with a protective black cap that protects it from
dust and electrostatic charges. It is advisable to always leave this cap on the card's connector
when the interface is not used.
The cards are fitted with termination resistances to be connected only to the first and last
network connector. Do not forget to connect the ground wire among the various devices
connected to the network.
The cable must not be longer than 1200 m, it must be shielded and have metallic or
metallised connecting connectors. We recommend using Belden 8777 cable at 24 AWG with
“Phoenix” “SUBCON 9/F – SH” type connectors.