ProSoft Technology 5202-DFNT-MCM4 - Manual (Page 55)

Modbus Port Expander (4102/5102-MBS3-MBM) MCM ♦ ProLinx Gateway
Driver Manual Modbus Master/Slave
ProSoft Technology, Inc.
Page 55 of 80
October 16, 2009
7.2.13 Guard Band Timeout
0 TO 65535
A value of 1 to 65535 sets the time in milliseconds. When this period has elapsed
and no further data is received, the gateway will handle the last received data
sequence as a Modbus message to be processed.
This parameter specifies the Guard Band Timeout between packets in multi-drop
slave mode. A value of 0 uses the default time, which is roughly equivalent to the
time it would take to send 3.5 bytes at the selected baud rate. This is the delay
value specified by the Modbus RTU protocol specifications.The following Guard
Band Timeout values will be automatically used by the gateway when Use Guard
Band is set to Y
ES and the Guard Band Timeout is set to the default value of zero
(0).
Baud Guard Band Timer (ms)
110 350
150 256
300 128
600 64
1200 32
2400 16
4800 8
9600 4
19200 2
28800 2
38400 2
57600 1
115200 1
7.2.14 Request Timeout
Use this default timeout.
7.2.15 Busy Timeout
0 to 65535
This parameter specifies the number of milliseconds to wait for the DF1 Master
port to become available. If the DF1 Master port is processing a command list
request, the busy flag will be set. The flag will remain busy until the
communication transaction is complete. If the port does not become available
before the busy timeout expires, the message will be aborted. If the Master port
becomes available before this timeout expires, the request will be routed to the
Master port.