TECHNICAL INFORMATION, Serial Interface
Sysmex SF-3000 Operator's Manual -- Revised September 1995 C-5
4. Transmission Procedure (One-way communication from SF-3000 to Host)
Two classes are prepared and can be selected. Refer to Chapter 11: System Setup
for additional information. The factory configuration is Class B and the interval
time is 2 seconds.
(1) Class A -- Data is transmitted in the form of a text or blocks. The host
computer checks the start and end characters as well as the parity bit received
after each character, but does not transmit any response. Therefore, the SF-
3000 will not wait for the response ACK (06 in hexadecimal) or NAK (15 in
hexadecimal) from the host computer and transmits data to the host computer
in one direction with two control signals (CTS and DSR) only.
(2) Class B -- This class is identical to Class A except the receiving side. When
the host computer receives transmitted data, the host computer transmits a
response followed by a sequence. If necessary the host computer also
checks the contents of the text (or block). The SF-3000 waits for the
response ACK or NAK from the host computer in addition to two control
signals (CTS and DSR) and transmits the next sample data upon receiving
ACK from the host computer.
(3) Transmission Error -- If the SF-3000 detects an error after transmitting data,
an error message is displayed and transmission of data is terminated. The
customer has to resolve the following error status to transmit data.
(a) DSR is OFF,
(b) CTS does not become ON within 5 seconds after entering a command
to transmit data to 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.
NOTE: Error (c) or (d) occurs only when the Class B is utilized.
HC flashes when error (a) or (b) occurs and HC flashes in
reverse video when error (c) or (d) occurs.
(4) Interval Time -- Time interval between two data transmitted to the host
computer can be selected with the setting program. The interval time means
the period after the SF-3000 received the response of ACK/NAK from the
host computer until the SF-3000 starts transmission of the next sample data
in the Class B.
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