Thermcraft XST-3-0-36-3V - Manual (Page 160)

Safety Information Installation and Operation Handbook
E-2 2408 and 2404 Controller
Profibus-DP is a multimaster, master-slave, token passing network. The 2408f and the 2404f
operate as intelligent slave units. More detailed information, including a detailed guide to
products available, may be obtained from the various world wide Profibus user organisations.
You will find contact information in trade magazines or by reference to
http://www.profibus.com on the World Wide Web.
Technical Specification
Physical Medium 2-wire RS485
Network topology Linear bus with active termination of the bus at both ends
Stub lines permitted if < 6.6m in length
Protocol Profibus-DP, intelligent slave
Baud rate Up to 1.5Mb/s
Number of stations 32 per network segment. Up to 127 with repeaters
Electrical Connections
The diagram below is also shown in Chapter 1.
SHIELD
Station 1
HA
HB
HC
HD
HE
HF
Shield
VP (+5Vdc Voltage Potential)
B (Rx/Tx +ve)
A (Rx/Tx -ve)
DGND (Digital ground)
Not connected B
390 Ω
Last Station
HA
HB
HC
HD
HE
HF
Shield
VP (+5Vdc Voltage Potential)
B (Rx/Tx +ve)
A (Rx/Tx -ve)
DGND (Digital ground)
Not connected
Intermediate stations
Last station only requires
terminating resistors 390 Ω
220 Ω
A
B A
B A
2408f or 2404f controller
2408f or 2404f controller
Twisted
pair
Twisted
pair