Communication Interface - Siemens SENTRON PAC RS485 Manual

Technical data

10.4 Communication interface

10.4 Communication interface
Technical data
Table 10-5
Electrical interface
Connection type
RS 485 data transfer:
supported baud rates in bps
Supported address range
Supported communication protocols
Bus cycle
Supported modes
Stations
Integral bus terminator
Integral line polarization
1) Each device on the bus must have a unique address.
2) The communication protocols supported depend on the SENTRON PAC in each case.
3) If necessary, you can switch on line polarization.
Table 10-6
Connection type
70
Technical data for the communication interface
Connection types with associated conductor cross-sections
Solid
Finely-stranded
Finely-stranded with end sleeve, without plastic
sleeve
Finely-stranded with end sleeve, with plastic
sleeve
- AWG / kcmil
Finely-stranded with TWIN end sleeve, with
plastic sleeve
Values
RS 485, twisted-pair cable + 1 cable for Common
Terminal block with screw terminals
4800 /9600 / 19200 / 38400 / 57600 / 115200
Standard: 19200
The following is supported in conjunction with the
SENTRON PAC3200:
max. 38,400 bps
1 to 247
1)
MODBUS RTU
•
2)
SEAbus
•
The bus cycle depends on:
1. The number of nodes
2. The data volume
3. The baud rate
Unicast
•
Broadcast
•
Max. 32 including master
120 Ohms resistance
560-Ohm pull-up resistor for 5 V voltage
•
560-Ohm pull-down resistor
• 3)
Conductor cross-sections
1 x 0.2 ... 2.5 mm
2
2 x 0.2 ... 1 mm
2
1 x 0.2 ... 2.5 mm
2
2 x 0.2 ... 1.5 mm
2
1 x 0.25 ... 2.5 mm
2
2 x 0.25 ... 1 mm
2
1 x 0.25 ... 2.5 mm
2
24 ... 12
2 x 0.5 ... 1.5 mm
2
Manual, 02/2008, A5E02091800B-01
3)
PAC RS485