Service manual

Confidential BTP-M280 Service Manual
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3.2.2 Interface connection and signal function
Signal and function：
Pin Signal Name Signal Direction Function
1 FG — Frame ground
2 TXD OUTPUT Data output
3 RXD INPUT Data input
4 RTS OUTPUT Ask for sending
6 DSR INPUT Host ready
7 SG — Signal ready
20 DTR OUTPUT Data terminal ready
3.2.3 Serial connection
Host Printer
TXD---------------RXD
RXD---------------TXD
DSR---------------DTR
CTS---------------RTS
RTS---------------CTS
DTR---------------DSR
FG -----------------FG
SG -----------------SG
3.3 Parallel interface
Parallel interface works under IEEE1284 compatible mode and bi-direction mode.
3.3.1 Parameter
¾ Data transmission： 8 bit parallel
¾ Synchronized mode： Externally supplied nStrobe signals
¾ Handshaking mode： Busy Signal
¾ Handshaking pressure： TTL compatible
¾ Connector： IEEE 1284-B(CENTRONICS) socket
3.3.2 Time Sequence of the Parallel Interface Module
Time Sequence of Parallel Interface（Compatible mode）