ProSoft Technology 5202-DFNT-MCM4 - Manual (Page 36)

MCM ♦ ProLinx Gateway Serial Port Modbus Error and Status Data
Modbus Master/Slave Driver Manual
Page 36 of 80
ProSoft Technology, Inc.
October 16, 2009
The STATE register may display any of the following values.
STATE Value Description
-2 Preparing port, Flushing all buffers, Scan for RTS-Off, or Waiting for port enable
signal
-1 Waiting for receipt of data
0 Undefined state
1 Receiving a message from the Master
2 Building a slave response message
2000 Sending slave response to the Master
The COMM STATE register may display any of the following values.
COMM STATE
Value
Description
0 Port not sending data (Wait for send)
1 Setting up minimum Response Delay Timer
101 Waiting for Minimum Response Delay to timeout
2 Turning on RTS line and starting RTS-On Delay Timer
3 Waiting for RTS-On Delay timer to timeout
4 Sending data
5 Waiting for all data to be sent and starting RTS-Off Delay Timer
6 Waiting for RTS-Off Delay timeout and then turning OFF RTS line after timeout
4.2.3 Master Port: Command List Errors
The individual command errors for each Master port are returned to the address
locations specified in the following table. Each port can have up to 100
commands configured. Each configured command will use one word of these
data areas to store a value representing the execution status from the most
recent command execution attempt.
Modbus Port Address Range
0 4410 to 4509
1 4810 to 4909
2 5210 to 5309
3 5610 to 5709
The first word in the defined register location contains the status/error code for
the first command in the port's Command List. Successive words in the
Command Error List are associated with corresponding commands in the list.
Refer to Error Codes (page 39) to interpret the status/error codes present in this
data area.