3
GFK-0519B
GraphicsDisplayCoprocessor(GDC)
5
4
SHLD
TD
RD
DCD
CTS
DTR
GND
f
3PL
4PL
RS-232
PCM
PROGRAMMING S/W
ÎÎ
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IC647 PROGRAMMER GDC
25-PIN
CONNECTOR
a44464
GDC
AT
9-PIN
CONNECTOR
GDC
25-PIN
CONNECTOR
AT CABLE
(IC690CBL701) (IC690CBL702)
IC647 PROGRAMMER
PIN PIN PIN PIN
3
2
5
20
8
1
7
2
3
8
9
7
TD
RD
RTS
CTS
DCD
DTR
GND
TD
RD
CTS
DTR
DCD
SHLD
GND
1
2
3
4
7
8
5
CD
RD
TD
DTR
RTS
CTS
GND
1
2
3
8
5
20
7
9-PIN
CONNECTOR
PROGRAMMER
Figure 3. Example of PCM Development System
ConnectiontoGDC
Serial Ports
Although both ports are RS-232 and RS-422/RS-485
compatible and the signals shown in both Table 1 and
Table 2 are available at each connector, the use of each
port is dedicated for GDC operation.
Port 1 (3PL) and Port 2 (4PL)
Port 1 (3PL) is normally connected to an RS-232 serial
COM port of a host computer for communications to
PCOP at 19.2 Kilobaud. Alternately, port 1 may be
connected to a serial RS-232 printer (see the Graphics
Display System User’s Manual to reconfigure Port 1).
Figure 3 shows typical cable connections for this
purpose and Table 1 shows the details of the RS-232
signals.
Table 1. Port 1 and 2 - RS-232 Signals
PIN FUNCTION SIGNAL
NAME I/O
1 Shield - -
2TransmittedData TD Output
3ReceivedData RD Input
4Request To Send RTS Output
5Clear To Send CTS Input
7Signal Ground GND -
8DataCarrierDetect DCD Input
20 Data TerminalReady DTR Output
Port2(4PL)isconfiguredasa1200baudRS-422portand
is dedicated to accepting keyboard input from the
GDT’s RS-422 port. Figure 4 shows appropriate cable
connections and Table 2 shows usable RS-422 signal
details.
Table 2. Port 1 and 2 - RS-422/485 Signals
PIN FUNCTION SIGNAL
NAME I/O
7Signal Ground SG -
9Send Data (A) SD (A) Output
10 Request To Send (A) RTS (A) Output
11 Clear To Send (A) CTS (A) Input
12 Termination for pin 11 - -
13 ReceiveData(A) RD (A) Input
21 Send Data (B) SD (B) Output
22 Request To Send (B) RTS (B) Output
23 Clear To Send (B) CTS (B) Input
24 Termination for pin 25 - -
25 ReceiveData(B) RD (B) Input
SD ( A )
SD ( B )
SIG GND
RD ( A )
RD ( B )
TERM
SIG GND
GDT
RS-422
PORT
25- PIN
MALE 25- PIN
FEMALE
25- PIN
MALE
PIN a44456PIN
13
25
24
7
4
3
9
25- PIN
FEMALE
GDC
PORT 2
Figure 4. GDC Port 2 Connection to GDT
Video
The GDC provides EGA video resolution of 640 x 350
pixels. This video is provided to the GDT in the form of
RGB signals withsync ongreen. Video signalsfrom the
GDC are provided through the 9-pin D connector on
the module. The cable has three RG-179/Ucoaxial
cables, terminated with three BNC connectors at the
GDT end. Figure 5 shows wiring details of this cable.
