16
Ext Comm Cfg #2
: Selects the Modbus RTU network characteristics (baud
rate, parity and stop bits). Refer to section 8 for more information.
Ext Comm Cfg #3
: Defines an optional network timeout timer. Allowable
values are as follows:
0
............. timer disabled
1
-
255
..... 1s-255s timer selected
If the network timer is disabled, then no special processing will occur based on
the interval between received network packets: the interface will simply
continue to wait for the next incoming packet that it may take action on.
Upon initial power-up and after each timeout occurrence, the network timer will
not start until a complete packet has been received by the interface and
responded to. Once started, a complete packet must be received within the
timeout time setting to prevent the timer from expiring. As the timeout timer is
principally intended to monitor network health, received packets do not need to
be directed at any specific interface: even if an interface detects a packet
intended for a different interface on the network, it will consider the network
“healthy” and therefore reset its timeout timer.
The resultant behavior when a network timeout occurs is protocol-dependent.
Refer to the sections of this manual pertaining to the specific protocols for
further details.
Ext Comm Cfg #4
: This parameter is a read-only error code. If the ASD-
NANOCOM interface experiences any fatal errors during initial configuration or
operation, then this parameter can be inspected to determine the specific error
code to aid in troubleshooting the problem. An example of a fatal error would
be if the Modbus RTU protocol is selected but the
ASD Number
parameter is
set to
0
. A list of possible error codes is provided in Table 1.
Table 1: ASD-NANOCOM Error Codes
Error Code
Meaning
0
NO ERROR (normal operation)
1 INVALID
EQUIPMENT
2 INVALID
PROTOCOL
3 INVALID
ADDRESS
4
INVALID NETWORK SETTINGS
5
RESOURCE ALLOCATION ERROR
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