H. ZANDER GmbH & Co. KG • Am Gut Wolf 15 • 52070 Aachen • Germany • Tel +49 241 9105010
Fax +49 241 91050138 • [email protected] • www.zander-aachen.de
41
Operating manual ZX09/20/21-Series
7.2.4 ZanderLink wiring
ZanderLink uses the complete RS-485 interface for the connection per subscriber,
i.e. all four terminals, since it is a synchronous serial transmission (one channel for a
clock signal, the second channel for the data bits).
The connection of two Zander controllers via ZanderLink is made via the terminals
1+ and 1- as well as 2+ and 2- of the RS-485 interface using a shielded twisted-pair
four-wire cable (see Fig. 26a). The shield must be connected to a shielding rail as
close as possible to the devices with low impedance. A terminating resistor of 120
Ohm must be connected to terminals 1+ and 1- or 2+ and 2-.
Alternatively, the SSI port of the controllers can be used for ZanderLink. Here the
terminals Ck+ and Ck- as well as D+ and D- of both participants are to be connected
to each other by means of a shielded twisted-pair four-wire cable (see fig. 26b). The
SSI ports are already equipped with 120 Ohm terminating resistors inside the
device, so that no external resistors have to be connected here.
The SSI port and the RS-485 port can also be used in parallel, so that, for example,
a master can communicate with two slaves or one slave can simultaneously be the
master for another slave.
120 Ohm
120 Ohm
120 Ohm
120 Ohm
Fig. 26: Connection of two controllers via ZanderLink (e.g. on ZX09A)
a)
1+ 1- 2+ 2- Ck+ Ck- D+ D-
RS-485
SSI
Shield rail
(PE)
1+ 1- 2+ 2- Ck+ Ck- D+ D-
RS-485
SSI
1+ 1- 2+ 2- Ck+ Ck- D+ D-
RS-485
SSI
Shield rail
(PE)
1+ 1- 2+ 2- Ck+ Ck- D+ D-
RS-485
SSI
b)
