Watlow 8PID Controller Manual de usuario descargar pdf (Pagina 15)

The connections are shown for a single controller:

Multiple ANAFAZE 8 PIDs' are connected in series. R+ is connected to the first unit

TXD and TXD* from the first unit is connected to TXD of the next unit. These serial

connections are continued until the last unit is reached. The last unit TXD* is connected

to the computer R-. T+ is connected to the first unit RXD and the RXD* is connected to

the next unit. The last unit RXD* is connected to the computer T- as shown:

3.2.7 OPTICALLY ISOLATED RS-232 INTERFACE

The optically isolated interface allows connection to computers using RS-232 with

additional noise protection. Many computer RS-232 interfaces connect the RS-232 signal

ground directly to the computer third wire ground. Thus any power line noise is directly

connected to the ANAFAZE 8 PID through the serial interface. In addition if there is

common mode voltage between the ANAFAZE 8 PID and the computer this noise will

also be coupled into the communication lines. To prevent this problem for RS-232 users,

the optically isolated RS-232 interface is recommended. The connections are different

from the normal serial interface since the ground is isolated. The connections are as

diagrammed:

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 54 55

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Watlow 8PID Controller Manual de usuario Pagina 15