SYSMEX SF-3000 User Manual

TECHNICAL INFORMATION, Serial Interface
C-6 Sysmex SF-3000 Operator's Manual -- Revised September 1995
5. Transmission Protocol (Two-way communication)
Transmission Protocol should be fixed in Class B to inquire order information to
the host computer. Selecting Class A will lead to an incorrect communication
without showing an error message.
(1) The SF-3000 inquires the order information and receives order information
text from the host computer in the following sequence;
(a) The SF-3000 sends order inquiry text to the host computer.
(b) The host computer verifies the received data and responds by sending
NAK when an error exists. When no error exists, host computer
sends ACK and the order information text that was inquired.
(c) If the SF-3000 receives NAK from the host computer, SF-3000 re-
sends the inquiry text. If the SF-3000 receives ACK, SF-3000 verifies
the following order information text and sends NAK when an error
exists. When no error exists, SF-3000 sends ACK to the host
computer.
(d) If the host computer receives ACK from the SF-3000, the host
computer completes the communication of order information for one
sample. If NAK is received from the SF-3000, the host computer re-
sends the order information text to the SF-3000.
SF-3000 Host Computer
Order inquiry text
→
Resend order inquiry up to 3 times when
receiving NAK
←
• ACK when detecting no error in order
inquiry transmission
• NAK when detecting an error in order
inquiry transmission
←
Order information for the inquired sample
• ACK when detecting no error in order
information transmission
• NAK when detecting an error in order
information transmission
→
Resend order information up to 3 times
when receiving NAK
(2) Transmission Error -- If the SF-3000 detects an error after transmitting data,
an error message is displayed and transmission of data is terminated. The
operator has to resolve the following error status to correctly transmit the
data.
(a) DSR is OFF,
(b) CTS does not become ON within 5 seconds after entering a command
to transmit data to the host computer,
(c) SF-3000 receives no response of either ACK or NAK within 15
seconds after transmitting data, or
(d) SF-3000 receives NAK after three retries.

SYSMEX SF-3000 Specifications

General

Brand	SYSMEX
Model	SF-3000
Category	Measuring Instruments
Language	English