Westermo RM-115S - Manual (Page 27)

115S Serial I/O Module User Manual
man_115S_1.14.docx Page 27
4.2.3 Configurable ACK Timeout
All communications between Elpro devices using Elpro Protocol is two way
communications. The initiating module sends a message to an end device and expects to
get a response within a given time period, this response is called an acknowledgement.
If this acknowledgment is not received in the allotted timeframe the message is retried up
to 4 times with a random 0-5 seconds delay between each retry. If all retries are not
acknowledged then a communications fail can be flagged.
Typically the 115S expansion I/O modules are used with 105U/905U I/O radios and the
longer Acknowledge Timeouts are not required.
If using the modules with Elpro modems or third party devices were the
acknowledgement is likely to take longer than 5 seconds then a configurable Ack time
can be implemented to overcome these timing issues. E.g. Communication path may have
a number of repeaters or be going through a network with longer timeframes (GSM or
Ethernet Networks)
Note: The Configurable Acknowledge timeout is only available in firmware version
2.04 and greater.
The configurable Ack timeout allows the wait time of this response to be extended by
adjusting a register shown in the table below.
Address Description
40205 Configurable Ack timeout
The Ack timeout is configurable from 32msec to 34 minutes 57 seconds, see examples
below.
Ack Timeout will be added to the default random 0-5 sec retry time.
The factory value for the Ack timeout will be 0 which will use the default 0-5 second
staggered timeout.
Decimal Value Timeout Decimal Value Timeout
1 32msec 1875 1 Min
16 500msec 3750 2 Min
31 1 Sec 7500 4 Min
62 2 Sec 9375 5 min
100 3.2 sec 18750 10 Min
156 5 Sec 28125 15 Min
312 10 Sec 37500 20 Min
469 15 Sec 46875 25 Min
625 20 Sec 56250 30 Min
1000 32 Sec 65535 34 Min 57 Sec