MS/TP

MS/TP

MS/TP(Master Slave Token Passing)

A token passing network that controls access to a bus network

MS/TP

Media & Characteristics

Cable

– Shielded Twisted-Pair (STP)

Cable Length Per Segment

– 4000 ft (1200 meters) AWG 18

Nodes Per Segment

– 127 Max.

Termination

– 2 - 120 Ω Resistors 5% (placed at each end of segment)

MS/TP

Connections & Terminations

120 Ω

120 Ω

RS-485MS/TP

ETHERNET

b4920

b3xxx

b3xxx

b3xxx

4,000 ft.127 nodes

b3xxx

b3xxx

B-link Repeater

RS-485MS/TP

120 Ω

120 Ω

120 Ω

b3xxx

b3xxx

b4920

CX/NetController

4,000 ft.127 nodes

4,000 ft.127 nodes

4,000 ft.127 nodes

120 Ω

MS/TP

Extending Segments

Detects and passes signals received from one segment onto all other segments

B-link RS-485 Repeater

b-link

• MS/TP Only

• Four RS-485 Ports

b4920

MS/TP

b4920 Baud Rate

Continuum 1.62 and beyond, the baud rate of commport 1 increases to 76.8K

MS/TP

MS/TP Enhanced Mode

Changes the token passing sequence where the b4 is treated like a priority controller

– Regular Mode: b4 gets the token just as everyone else does

– Enhanced Mode: b4 receives the token every other time

• Graphics within CyberStation require a lot of polling of data to the b4

MS/TP

Identifying BACnet IP & MS/TP Network Numbers

By default each device will be assigned the same UDP port number

Same UDP BACnet Network Number