2-8 Section 2: Installing the Model 9500B
2.8.3 Serial Port (Rear Panel)
This 9-way D-Type socket is located to the left of the Parallel
port connector on the rear panel. Its connections are RS232-
compatible; carrying control and power supplies for, and receiving
data from, an external tracker ball.
Pin Layout
SERIAL PORT
Pin Designations
_H ≡ Logic-1 active; _L ≡ Logic-Ø active.
Pin No. Name Description
1 - - - Not used
2 RXD0_L
Serial Data: Tracker Ball → 9500B
3 TXD0_L
Serial Data: 9500B → Tracker Ball
4 DTR0_H Data Terminal Ready
5 0V_F Digital Common
6 DSR0_H Data Set Ready
7 RTS0_H Request to Send
8 CTS0_H Clear to Send
9 - - - Not used
2.8
Connectors and Pin Designations
(Contd.)
2.8.2 Parallel Port (Rear Panel)
This 25 way D-Type socket is located beneath the IEEE-488
connector on the rear panel. Its connections are similar to the 25-
way printer port on PCs, carrying control and data for an external
printer as designated in the table.
Pin Layout
9500B 9500B 9500B Description or
Pin No. Signal Name I/O Common Meaning
1 STROBE_L Output 1µs pulse to cause printer to read one byte
of data from data bus DO1 — DO8.
2 DO1 Output Data bit 1
3 DO2 Output Data bit 2
4 DO3 Output Data bit 3
5 DO4 Output Data bit 4
6 DO5 Output Data bit 5
7 DO6 Output Data bit 6
8 DO7 Output Data bit 7
9 DO8 Output Data bit 8
10 ACKNLG_L Input Pulse to indicate that the printer has
accepted a data byte, and is ready for more
data.
11 BUSY_H Input Printer is temporarily busy and cannot
receive data.
12 P_END_H Input Printer is out of paper.
13 SLCT_H Input Printer is in on-line state, or connected.
14 AUTO_FEED_L Output Paper is automatically fed 1 line after printing.
This line is fixed _H (high) by the 9500B to
disable auto feed.
15 ERROR_L Input Printer is in 'Paper End', 'Off-line' or 'Error'
state.
16 INIT_L Output Commands printer to reset to power-up
state, and in most printers to clear its print
buffer.
17 SLCT_IN_L Output Commands some printers to accept data.
This line is fixed _L (low) by the 9500B.
18-25 0V_F Output Digital Common
_H ≡ Logic-1 active; _L ≡ Logic-Ø active.
PARALLEL PORT
113
1425
Pin Designations
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