Introduction
4
1.5.8 Automation Responses
When the CPM3 sends an event to the computer, it checks for 3
responses: ACK, NAK or Unknown/No Response. An ACK tells the
CPM3 the computer automation got the event successfully. A NAK
tells the CPM3 the computer automation got the messages but
didn't understand it.
The line card will attempt to send the messages 25 times. If after 25
attempts it continually gets a NAK from the computer automation,
the CPM3 will send an internal communication error event to the
printer. After 25 attempts, the line card will send an internal com-
munication event to the printer, and then begin attempting to send
the next event in the line card buffer to the computer automation.
Any other response from the computer automation, including no
response will cause the CPM3 to attempt to send the message
again, up to 4 times. If after 4 attempts the CPM3 gets no response
or an unknown response, it will assume nothing is connected and
generate an alarm.
1.5.9 Automation Absent
When the computer is not responding to transmissions, the CPM3
will generate a 'SG-Serialx fail' or 'SG-TCP/IPx Fail' trouble. When a
trouble occurs, the CPM3 will continue to attempt to send a heart-
beat signal to the computer until it gets a response. The System III
receiver will make 4 attempts, then wait for the next heartbeat
period before making another 4 attempts. The typical heartbeat
interval is 30 seconds..
This signal is used to supervise the communication between the
receiver and computer automation. It is sent to the computer auto-
mation every 30 seconds and is programmable from the receiver.
The computer automation should acknowledge this signal with an
[ACK]. The CPM3 can be programmed to send a test signal to the
computer automation once every 01-99 seconds to test the connec-
tion between the CPM3 and the computer automation (30 seconds
is recommended). If a heartbeat fails to get a response from the
computer automation, the CPM3 will immediately transmit the
heartbeat again, up to 4 attempts. If all computer automation out-
put fails and if by default the TCP/IP automation fails, the CPM3 will
switch to the serial automation output.
If the output fails, the CPM3 will switch to manual mode, all signals
will be displayed on the LCD and will require a manual acknowl-
edge. To re-establish connection with the TCP/IP a reset fallback
command must be generated from the Console software. If the line
card buffers are full, the line cards will stop answering the calls.
1.5.10 System III SIA Internal Status Output
0RRLLL[#0000|NYYZZZZ]: RR is the receiver number of the CPM3,
and LLL will be 000 to signify a CPM3 event. Refer to Appendix A:
CPM3 Internal Status Messages.
Supervisory Heartbeat Signal Protocol (1)
100000sssssssssss@ssss[DC4]
00000 Receiver number (Real programmed number
Never virtual).
S Space Character.
@ Supervisory Signal.
[DC4] Terminator, 14 Hex
0 0RRLLL[#0000|NYYZZZZ] Protocol ID
RR Receiver number of the CPM3
LLL 000 signifies a CPM3 Event.
0000 System III Account.
NYYZZ SIA Event
[DC4] Terminator, 14 Hex
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