Specifications

B-2

B Buep 19-Expander driver

Interfaces Interface and baud rate can be selected from combinations set with the

DIL switches 5 and 6 on the rearside of the PCS 090. The choice consists

of: RS-232C or TTY, 19200, 9600, 4800, or 1200 baud. The speed of the

communication depends decisively on the baud rate (e.g. a changed va-

riable must be read 2 times!). Select only on a slower baud rate if you

have longer distances between the participants. We recommend to

communicate with 19200 baud via TTY.

The relation baud rate to maximum distance is as follows:

Baudrate max length RS-232C max. length TTY

19200 15m 150m

9600 15m 300m

4800 15m 350m

1200 15m 350m

When using a shielded and twisted cable with 14 x 0,14mm, a line resistance

of less than 138 /km, and a capacity of less than 120 pF/m.

Communication data block The number of the communication data block containing the send ad

receive buffers must be passed on to the 3P90BUEP drivers. The value 0

(default value) must be entered if you do not change the communications

software in the programmable controller. The communication data block

consists of 2 times 32 data words (= 128 bytes).

Timeout time The timeout time to be set is the maximum time, the programmable con-

troller needs for the cyclical call of the PCSKOMM communication pro-

gram plus the communication time. The time is settable between 0.5 and

2.55 seconds. Time monitoring is activated only if the order read by the

PCS is not yet the current one.

Thus, the resulting timeout parameter (element x 10 ms) and the timeout

parameter P6 (Kx.1 = x 100ms) for the programmable controller without

user program is as follows:

Baudrate Timeout PCS P6 (timeout progr. contr.)

19200 50 K2.1

9600 50 K3.1

4800 50 K5.1

1200 170 K17.1

Attention!

You must add the maximum scan time to the above indicated times.

Example: 19200 baud, 800 ms maximum scan time -> timeout PCS =

130, P6 = K10.1.