Serial Interface Timings - Dascom 1500 User Manual

Serial interface (option)
20 DTR
(Data Terminal Ready)

Serial Interface Timings

Ready/Busy
INIT
RTS
BUSY
(DTR)
DSR
Receive Data
Valid
Receive Data
1. Data received when DSR is low is considered invalid and will be discarded.
2. BUSY LOW (DTR) is dropped to indicate to the host that the receive buffer is full.
B-10
If user selects RTS as Busy line, this line will be set
high and will remain high after the serial interface
finishes its Reset.
If user selects DTR as Busy line, this line will be set
high after the serial interface finishes its Reset
sequence. However if Ready/busy handshake pro-
tocol is selected, this line is used to indicate to PC
whether or not Printer is ready to receive any more
data.
1
2
Interfaces