Serial Interface 7 - 11
Hardware Handshaking
The data interface consists of a serial port designed to operate either with or without the hardware handshaking
lines
Request to Send
(RTS) and
Clear to Send
(CTS).
If Standard RTS/CTS handshaking is not selected, scan data transmits as it becomes available. Select Standard
RTS/CTS handshaking to transmit scan data according to the following sequence:
•
The decoder reads the CTS line for activity. If CTS is asserted, the decoder waits up to the Host Serial
Response Time-out for the host to de-assert the CTS line. If, after the Host Serial Response Time-out
(default) the CTS line is still asserted, the decoder sounds a transmit error and discards any scanned data.
•
When the CTS line is de-asserted, the decoder asserts the RTS line and waits up to the Host Serial
Response Time-out for the host to assert CTS. When the host asserts CTS, data transmits. If, after the Host
Serial Response Time-out (default) the CTS line is not asserted, the decoder sounds a transmit error and
discards the data.
•
When data transmission completes, the decoder de-asserts RTS 10 msec after sending the last character.
•
The host responds by negating CTS. The decoder checks for a de-asserted CTS upon the next transmission
of data.
During data transmission, the CTS line should be asserted. If CTS is deasserted for more than 50 ms between
characters, the decoder aborts transmission, sounds a transmission error, and discards the data.
If the above communication sequence fails, the decoder issues an error indication. In this case, the data is lost and
must be rescanned.
If hardware handshaking and software handshaking are both enabled, hardware handshaking takes precedence.
•
None
: Scan this bar code to disable hardware handshaking.
•
Standard RTS/CTS
: Scan this bar code to select Standard RTS/CTS Hardware Handshaking.
•
RTS/CTS Option 1
: The decoder asserts RTS before transmitting and ignores the state of CTS. The decoder
de-asserts RTS when transmission completes.
•
RTS/CTS Option 2
: RTS is always high or low (user-programmed logic level). However, the decoder waits
for CTS to be asserted before transmitting data. If CTS is not asserted within Host Serial Response Time-out
(default), the decoder issues an error indication and discards the data.
•
RTS/CTS Option 3
: The decoder asserts RTS prior to any data transmission, regardless of the state of CTS.
The decoder waits up to Host Serial Response Time-out (default) for CTS to be asserted. If CTS is not
asserted during this time, the decoder issues an error indication and discards the data. The decoder
de-asserts RTS when transmission completes.
NOTE
The DTR signal is jumpered to the active state.
Summary of Contents for Symbol PL4507
Page 1: ...Symbol PL4507 Decoder Integration Guide ...
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Page 3: ...Symbol PL4507 Decoder Integration Guide 72E 116649 02 Revision A April 2009 ...
Page 6: ...iv Symbol PL4500 Decoder Integration Guide ...
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Page 40: ...2 12 Symbol PL4507 Decoder Integration Guide ...
Page 43: ...Accessories 3 3 Figure 3 2 Symbol SE4500 to PL4507 21 Pin Flex p n 15 113896 01 ...
Page 45: ...Accessories 3 5 Figure 3 4 Symbol PL4507 30 Pin Mating Host Connector p n 50 12167 030 ...
Page 70: ...4 24 Symbol PL4507 Decoder Integration Guide ...
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Page 289: ...Advanced Data Formatting 11 25 Numeric Keypad continued 7 8 9 Cancel ...
Page 334: ...11 70 Symbol PL4507 Decoder Integration Guide Send ALT Characters continued Send Alt Send Alt ...
Page 355: ...Advanced Data Formatting 11 91 Alphanumeric Keyboard Space Single Close Quote Dash ...
Page 357: ...Advanced Data Formatting 11 93 Alphanumeric Keyboard continued ...
Page 358: ...11 94 Symbol PL4507 Decoder Integration Guide Alphanumeric Keyboard continued _ Underscore ...
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Page 361: ...Advanced Data Formatting 11 97 Alphanumeric Keyboard continued D E F G H I J ...
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Page 363: ...Advanced Data Formatting 11 99 Alphanumeric Keyboard continued R S T U V W X ...
Page 365: ...Advanced Data Formatting 11 101 Alphanumeric Keyboard continued d e f g h i j ...
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Page 367: ...Advanced Data Formatting 11 103 Alphanumeric Keyboard continued r s t u v w x ...
Page 368: ...11 104 Symbol PL4507 Decoder Integration Guide Alphanumeric Keyboard continued y z ...
Page 380: ...A 12 Symbol PL4507 Decoder Integration Guide ...
Page 389: ...Sample Bar Codes C 3 Data Matrix Maxicode ...
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