
STAR Modem™
38
2
•
If Modem -
ACK/NACK = enabled
when the Local Host receives a message correctly, it answers STAR Modem™
with the ACK character. Only then does STAR Modem™ acknowledge the RF
device which initiated the 2 way transaction with an Empty Answer.
•
Modem -
DATA/NACK = enabled
when the Local Host receives a message correctly, it answers STAR Modem™
with DATA. STAR Modem™ then answers the RF device which initiated the 2
way transaction with this DATA (i.e. command to RF device display).
Case 2 – STAR Modem™ in Stand Alone Mode as Client (like an RF device)
Figure 2 – Stand Alone Mode with STAR Modem™ 2 Client
In the figure above, STAR Modem™ 2 is in Stand Alone Mode as a dedicated
Client
(as an RF device). The following parameters may be set depending on the
application:
Modem
1
- ACK/NACK = enabled
Scanner -
Handshaking= RTS/CTS
•
If Modem 2 -
Transmission Mode = 1 way
ACK/NACK from Remote Host = disabled
FIFO = disabled
Handshaking = Modem (RTS/CTS)
In this case, Modem 2 sends data (messages) to the Remote Host. The special
case of FIFO disabled blocks transmission of the scanner until an
acknowledgement is received from Modem 1. Because ACK/NACK is enabled
for Modem 1, only after Modem 1 has received an ACK from the Remote Host
does it acknowledge reception (Empty Answer to Modem 2).
1
2
Содержание Star
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