Technical description Chapter 4
PA 7400
7
Serial ports:
Modes:
Serial port 1: ................................................... RS232, RS422, RS485 or
20 mA current loop (active, passive)
Serial port 2: ................................................... RS422, RS485 or
20 mA current loop (active, passive)
Addressing: .................................................... COM1, COM2, COM3, COM4
selectable per jumper
or with each address through
DIP switches
Memory: ......................................................... UART with 16-byte FIFO buffer
Protocol: ........................................................ 5-, 6-, 7- or 8-bit character
Parity: ............................................................. Even, odd, none, mark and space
1, 1 ½ or 2 stop bits
Transfer rates:
•
RS 232: ........................................................ max. 19200 Baud
(only serial port 1)
•
RS 422/RS 485: ........................................... max. 112000 Baud
•
20 mA current loop: ..................................... max 19200 Baud
Load resistance :
20mA current loop: ........................................
≤
300 ohm
Overvoltage protection:
•
RS 422/RS 485: ........................................... Breakdown voltage =
±
6.5 V
VCL
1)
=
±
11.3 V;
at Ipp
2)
= 35.4 A in 1 ms test
Ppp
3)
= SURGE 300 W / 1 ms
All lines are protected
against short-circuit through
PTC resistors.
•
20mA current loop: ...................................... Breakdown voltage =
±
26 V
VCL =
±
41.5 V;
at Ipp = 9.6 A in the 1 ms test
Ppp = SURGE 400 W/1 ms
Insulation voltage: .......................................... 1K VAC (RS 422/RS 485
and 20 mA current loop)
1
Clamping voltage
2
Surge non repetitive reverse current
3
Peak Pulse Power