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CARETAKER PLUS INSTALLATION AND OPERATIONS MANUAL
31
Appendix B: Pinout Specifications
Serial Models
DB25 Female
Pin Signal Name Acronym I/O Description
2 Transmit data TXD Output Serial data from port
3 Receive data RXD Input Serial data to port
4 Request to send RTS Output Always high
6 Data set ready DSR Input Low inhibits transmit data
7 Signal ground GND Common
20 Terminal ready DTR output
Pin 20 is the hardware flow control output. Pin 6 is the hardware flow control input.
Pin 6 has an internal pull-up to set it high when no signal is connected.
Parallel Models
Centronics 36 Female
DB25 Female
C36F
Pin
DB25
Pin
Signal Name
Port 0
Port 1-8
Description
1 1 STROBE output input Data transfer when pulsed low
2 2 DATA 0 output input Data LSB
3 3 DATA 1 output input
4 4 DATA 2 output input
5 5 DATA 3 output input
6 6 DATA 4 output input
7 7 DATA 5 output input
8 8 DATA 6 output input
9 9 DATA 7 output input Data MSB
10 10 ACK input output Pulsed low for next transfer
11 11 BUSY input output If high inhibits data flow
12 12 PAPER END input output Input unused, low when output
13 13 SELECT OUT input output Input unused, high when output
14 14 AUTOFEED output input Input unused, output high
16 GROUND -------- -------- Wired common all ports
19-30 18-25 GROUND -------- -------- Wired common all ports
31 16 INITIAL output Input Must be high to receive data
32 15 ERROR Input output Input unused, high when output
33 - GROUND -------- -------- Wired common all ports
36 17 SELECT IN output input Must be low to receive data