New Era NE-4000 Multi-Phaser Programmable Double Syringe - Manual (Page 37)

New Era Pump Systems Inc.
www.SyringePump.com
Model NE-4000 Multi-Phaser™
Publication #1200-01 32 09/05/14
< > Non-terminal syntax expansion
[ ] Optional syntax
{ } Required syntax
| Or. Choose one of the syntax options.
λ None. Syntax expands to nothing (lambda production).
" " Description of syntax expansion
9.2.2 RS-232 Protocol: Basic Mode
Command syntax (to pump):
<basic command protocol> => <command data> <CR>
Response syntax (from pump):
<basic response protocol> => <STX> <response data> <ETX>
In the “Basic” communications mode, a master-slave protocol is used, whereby the pump will only transmit in
response to a received command.
When the pump receives the <basic command protocol>, <command data> will automatically be stripped of all
space and control characters, and all text will be converted to upper case. This simplifies communications with the
pump when commands are being manually typed in from a generic terminal emulator.
To return the pump to Basic mode when in the Safe mode, send the following packet to the pump:
(0x2) ( 0x8) SAF0 (0x55) (0x43) (0x3)
9.2.3 RS-232 Protocol: Safe Mode
Command syntax (to pump):
<safe command protocol> => <STX> <length> <command data> <CRC 16> <ETX>
Response syntax (from pump):
<safe response protocol> => <STX> <length> <response data> <CRC 16> <ETX>
Safe mode uses a more structured protocol including detection of corrupted communications, communications time
outs, and auto-alarm responses. Safe mode is enabled using the ‘SAF’ command whose parameter setting is stored
in the non-volatile memory.
Safe mode uses a modified master-slave protocol, whereby the pump transmits in response to a received command.
But, the pump also automatically transmits a status packet when an alarm condition occurs.
Corrupted communications is detected using the 16 bit CCITT CRC algorithm computed over <transmitted data>.
Packets transmitted and received include the CRC within the packets.
The parameter sent with the “SAF” command is the communications time out. This time out, in seconds, is the
time between the reception by the pump of consecutive valid communications packets. Each time a valid
communications packet is received, the time out is reset. If the time out elapses, a pump alarm will occur, stopping
the pump and the Pumping Program. The pump will display , and the buzzer will sound, if alarms are
enabled, alerting the user. The communications time out timer will not restart until the next reception of a valid
packet.
In addition, there is a 0.5 second packet inter-byte time out. While receiving a communications packet, and before
its complete reception, if a delay of 0.5 seconds occurs between bytes, the incomplete packet will be discarded.
With the Auto-Alarm feature, whenever a pump alarm occurs, such as a pump stall, a response packet with the
alarm status information will automatically be transmitted.
Until the Safe Mode is disabled, each time power is applied to the pump, the pump defaults to the Safe mode of
communications, but the communications time out timer will not be enabled until the first reception of a valid
packet.
Although the communications time out timer is not enabled, the Auto-Alarm feature will be enabled. Therefore,
the pump will be in an Auto-Alarm only communications mode.
When power is applied to the pump, or if the system should reset, a system reset alarm occurs. The Auto-Alarm
feature, therefore, alerts the host computer that a pump reset has occurred.
Also, when the user changes the baud rate, the communications time out timer is disabled until the next valid
communications packet.