4-56

Parallel Mode Handshake Timing

Figure 1. Host Commands Received by Decode IC (Reader).

Handshake Timing

Falling edge of command ready to falling edge of command read. Max. = 30

µs for the first byte

of transmission from host.

Falling edge of command read to command valid. Min. = 0

µs

Command valid set up to rising edge of command ready. Min. = 0

µs

Rising edge of command ready to rising edge of command read. Max. = 8

µs

Rising edge of command read to falling edge of command ready. Min. = 0

µs

Handshake and Data Lines

Handshake and Data Lines

Figure 2. Decoder IC Data Sent to Host.

Handshake Timing

Note: The maximum can be infinite if there is no data to be transmitted. RTS can be used to

determine when there is data. If the scanner is active or escape sequence commands

CDY

CRD

PP0-PP7

tCA

tCS

tCB

tCR

tCC

RTS

DDY

PP0-PP7

tDD

tDF

tDO

DWR

tDA

tDW

tDH