100/180 mm PAPERLESS GRAPHIC RECORDER: USER GUIDE
HA028910
Issue 13 Sep 16
User Guide
Page 152
4.3.15 CONFIGURATION PARAMETERS (Cont.)
TIMEOUT
For ASCII (input) protocol, this allows a timeout value to be entered of between 50 and 3000 msec inclu-
sive. A value of 0 = no timeout. See also ‘Messaging Information’ below.
For Modbus Master protocol, this allows a timeout to be entered of between 100 and 9,999 msec (inclu-
sive), An error code B is generated (if so confi gured - see ‘Enable Error Code B’ below). If the master has
not received a reply to a request within the timeout period. For slaves confi gured with their own timeout
periods, these will override the entry here.
MESSAGE START/END CHARACTERS
For ASCII (input) protocol only, the message can be prefi xed by 0, 1 or 2 specifi c characters and can be
suffi xed by 0, 1 or 2 specifi c characters. The First and Second Start and End characters are entered as
decimal ASCII codes between 0 and 127 as required. 0 = no character, 10 = Line Feed; 13 = Carriage
Return.
See Annex B
for a list of ASCII codes. If only one start or end character is required, the fi rst char-
acter must be entered, and the second character be entered as zero.
FILTERS
For information on ASCII input text fi lters, refer to section 12.3.3.
GROUP SELECTION
For ASCII input protocol, this allows groups to be deselected/selected for receipt of the messages. A
checked box indicates that the associated group will receive the messages.
ENABLE ERROR CODE B
For Modbus Master only.
If enabled, this causes an error code B to be generated in the event of a timeout or a Cyclic Redundancy
Check (CRC) error.
ENABLE TALK THROUGH
For Modbus Master only.
If disabled, this prevents ‘external’ (Ethernet) masters from accessing the slaves connected to this instru-
ment. (I.E. only this instrument can act as a master to its slaves.)
MESSAGING INFORMATION
Characters are read into a buffer, until the end of message characters are received, or until the time-
since-last-character exceeds the entered Timeout value. Date, Time and ‘(Serial)’ are then prefi xed to the
message, which is then sent to the selected groups. The date and time relate to when the fi rst buffered
character was received. If Start-of-message characters are confi gured, characters will be read into the
buffer only after these characters have been received.
The buffer holds up to 120 characters plus date/time etc. and start/end-of-message characters . Further
characters are discarded until End-of-message is received, or timeout occurs.
Message characters below Hex 20 (decimal 32) will be replaced by question marks (?).
Message characters above Hex 7F (decimal 127) will be treated as Unicode.
