Opticon MDI-4000 Series, Руководство по последовательному интерфейсу, Страница: 36 / 139

MDI-4000 Series Serial Interface Manual
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To activate and save the new configuration, you need to use the Z2 command (save settings in
non-volatile memory).
CTS Timeout Commands
Command Flow Control Timeout Default
I0 Indefinitely
✓
I1 100 ms
I2 200 ms
I3 400 ms
Modem Link
As soon as power is supplied to the scan engine, t
he scan engine’s RTS line is OFF. When the
scan engine wants to transmit data to the host, it turns the RTS line ON. When the host is ready
to receive data, it responds with CTS ON. While the host CTS line is ON, the scan engine is
allowed to transmit data. When all data has been transmitted, the scan engine turns the RTS
line OFF. In response, the host turns
the scan engine’s CTS line OFF. While the RTS line is
ON, if the CTS line is not ON for a certain configurable period, the scan engine ends the
transmission and uses the buzzer to indicate an error.
Figure 17: Modem RTS/CTS Data Transmission
ACK/NAK Control
In ACK/NAK mode, the scan engine transmits data and expects to receive a specific response
from the host.
ACK/NAK Host Responses
Response Description
"ACK" (ASCII:0x06) The scan engine terminates transmission with the good read buzzer.
"NAK" (ASCII:0x15) The scan engine sends the data again.
"DC1" (ASCII:0x11) The scan engine terminates transmission without the good read or error buzzer.
Timeout If there is no response within 1 second, the scan engine terminates
transmission with the error buzzer.
TxD
CTS
RTS
Scan Engine Host System
CTS
RTS
RxD
Decode
Finish
Wait to
Send
Send Wait to
Send
Send Software
Buzzer
Cannot Receive Command