Siemens SENTRON PAC RS485 - Communication Interface

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