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4.0 INSTALLATION
The Model 2003 is typically installed by connecting the DB-25 port
to a computer or terminal, the keyboard port to a keyboard, and the
computer port to a computer’s keyboard port. This section describes
connection procedures.
There are three data ports on the rear panel of the Model 2003 --
an RS-232/RS-485 female DB-25 port, a Keyboard port, and a comput-
er port (see Figure 9, below).
4.1 CONNECTING RS-232/RS-485 DEVICES
When the DB-25 port of the Model 2003 is configured as an RS-
232 port, it looks like DCE (Data Circuit-Terminating Equipment).
Therefore, the Model 2003 serial port will connect directly to a DTE
(Data Termination Equipment) The following pinout diagram shows the
signal directions of the pins on the interface.
Pin#
Description
Direction
1
Protective Ground
N/A
2
Transmit Data
RS-232 Input to 2003
3
Receive Data
RS-232 Output from 2003
4
Request to Send
RS-232 Input to 2003
5
Clear to Send
RS-232 Output to 2003
6
Data Set Ready
RS-232 Output to 2003
7
Signal Ground (common return)
8
Carrier Detect
RS-232 Output from 2003
9
+5VDC
RS-232 Input
14
Transmit Data/Receive Data
RS-485 Input+/
16
Transmit Data/Receive Data
RS-485 Input-/Output-
20
Data Terminal Ready
RS-232 Input to 2003
4.1.1 Connecting RS-232 Terminal Equipment
The diagrams below show pin connections between the Model
2003's serial port and a standard RS-232 serial interfaces. You may
use these diagrams to construct your own cables, or you may purchase
pre-made cables from Patton Electronics.
PC/XT™ to Model 2003 Pin-Outs
Serial DB-25 (DTE)
Model 2003 DB-25 (DCE)
Pin No.
Pin No.
1 (FG) --------------------------------------- 1
2 (TD) --------------------------------------- 2
3 (RD) --------------------------------------- 3
4 (RTS) ------------------------------------- 4
5(CTS) -------------------------------------- 5
6 (DSR) ------------------------------------- 6
7 (SG) --------------------------------------- 7
8 (CD) --------------------------------------- 8
20(DRT) ------------------------------------20
Figure 9. Connection ports on the rear panel of Model 2003
RS - 232 / RS-485
Keyboard
Computer
PC/AT™ to Model 2003 Pin-Outs
Serial DB-9 (DTE)
Model 2003 DB-25 (DCE)
Pin No.
Pin No.
1 (CD)
8 (CD)
2 (RD)
3 (RD)
3 (TD)
2 (TD)
4 (DTR)
20 (DTR)
5 (SG)
7 (SG)
6 (DSR)
6 (DSR)
7 (RTS)
4 (RTS)
8 (CTS)
5 (CTS)
9 (n/c)
