Contemporary Control Systems BASrouter Portable Installation Guide (Firmware 2.6.x) - Manual (Page 15)

TD070210-0IG
15
MS/TP Parameters
MS/TP MAC (Default Value = 00)
This is the 8-bit (0–127) MAC address of the router’s MS/TP port, in
decimal. Lower MAC address numbers are preferred with the default
recommended. It is further recommended that all other BACnet devices
attached to the same MS/TP network be assigned consecutive MAC addresses
beginning with 1 without allowing any gaps in addressing. Slave devices may
have MAC addresses of 128–254, but MAC address 255 is reserved.
MS/TP Network (Default Value = 2001)
This 16-bit decimal network number (1–65534) must be unique for all
BACnet networks within the BACnet internetwork. No other networks,
regardless of type, can have the same network number. Do not use
addresses 0 or 65535 since these addresses are reserved.
Max Masters (Default Value = 127)
Only master nodes participate in the MS/TP token-passing process. The
highest master MAC address (in decimal) in the MS/TP network is 127
and you should use 127 if you are unsure of other MS/TP device
addresses. Each MS/TP device should use this same value. For a value
in this field to be proper, it must equal or exceed the highest MAC
address for any master on the network. Optimum performance occurs
when this value:
1. equals the highest MAC address of any master, and
2. all masters use sequential MAC addresses
Since many BACnet devices do not allow this parameter to be changed,
leave the BASRTP-B at the default value.
Max Info Frames (Default Value = 40)
This is the maximum number of messages that can be routed onto the
MS/TP network by the router per token pass. Its range is 1–100, and
typical values are 20–40. Smaller values provide less access to the
MS/TP network from the BACnet/IP network because they give native
MS/TP messages higher priority than those passed by the router from
BACnet/IP. The default value usually provides good performance.