Installation
6.1.2
Pin allocation for the 4-pin RJ9 telemetry port sockets
The telemetry port sockets allow control of telemetry devices via RS422 (RS485) in
full duplex mode.
Each group of telemetry ports (ports 1 to 4 in each case) is made up of 4 RJ9
modular sockets that are connected in parallel.
Each group supports its own protocol which can be selected in the configuration
program.
In the case of short transmission distances (approx. 100 m at 19.2 kbit/s) up to 4
telemetry devices (PTZ camera or domes) can be connected per group, with the
terminating resistor connected on only one of the devices.
If more than 4 telemetry devices are to be connected or the distance to these
devices is greater than about 100 m, an RS485/RS422 interface multiplier has to
be connected between the telemetry output and the telemetry devices.
Contrary to SIMATRIX NEO where the protocol for each port was set at the factory,
the SIMATRIX NEO V2 allows the free allocation of protocols to the ports. It is thus
possible to use various protocols within one system or to set several ports to
support the same protocol and thus to assign the same bus address several times.
Fig. 7
4-pin RJ9 telemetry port sockets
Pin Function
1 +TX
2 –TX
3 +RX
4 -RX
Tab. 1
Pin allocation for the 4-pin RJ9 telemetry port sockets
24
Siemens AB
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