Lynx EPM-4 - Manual (Page 37)

Utility Connector (J7)
EPM-4 Reference Manual Reference – 29
Utility Connector (J7)
The 50-pin utility connector (J7) incorporates the COM ports, keyboard and mouse, general-
purpose inputs, and the reset button and speaker. Table 5 shows the function of each pin and the
pinout to the connectors of the CBL/CBR-5009 I/O board.
Table 5: Utility Connector Pinout
J7
Pin
CBR-5009
Connector Pin Signal
J7
Pin
CBR-5009
Connector Pin Signal
1 COM1 1 Data Carrier Detect COM4 RS-422 RS-485
2 J3 6 Data Set Ready 26 J5 1 Ground Ground
3 (Top) 2 Receive Data 27 5 TxD+ (1)
4 7 Request to Send 28 4 TxD– (1)
5 3 Transmit Data 29 – Ground Ground
6 8 Clear to Send 30 2 RxD– TxD/RxD–
7 4 Data Terminal Ready 31 3 RxD+ TxD/RxD+
8 9 Ring Indicator 32 – Ground Ground
9 5 Ground 33 Mouse T4 +5V (Protected)
10 COM2 10 Data Carrier Detect 34 J4 T1 Mouse Data
11 J3 15 Data Set Ready 35 T3 Ground
12 (Bottom) 11 Receive Data 36 T5 Mouse Clock
13 16 Request to Send 37 PBRESET (2) 1 Pushbutton Reset
14 12 Transmit Data 38 S1 2 Ground
15 17 Clear to Send 39 GP Timer 3 Ground
16 13 Data Terminal Ready 40 Inputs 4 GP Timer Input 1
17 18 Ring Indicator 41 J2 – Ground
18 14 Ground 42 5 GP Timer Input 0
COM3 RS-422 RS-485 43 Keyboard B4 +5V (Protected)
19 J6 1 Ground Ground 44 J4 B1 Keyboard Data
20 5 TxD+ (1) 45 B3 Ground
21 4 TxD– (1) 46 B5 Keyboard Clock
22 – Ground Ground 47 PLED (3) 1 +5V (Protected)
23 2 RxD– TxD/RxD– 48 D1 3 Programmable LED
24 3 RxD+ TxD/RxD+ 49 Speaker – +5V (Protected)
25 – Ground Ground 50 SP1 SP1+ Speaker Drive
(1) Do not connect to these pins in RS-485 mode.
(2) The Pushbutton Reset signal (PBRST#) is also routed to pin 2 of J2 (CBL/CBR-5009). A
pushbutton can be attached to pins 2 and 1 (Ground) of J2.
(3) Pin 2 of D1 (CBL/CBR-5009) is connected to +5V (Protected), which provides power to the IDE
LED. Pin 4 of D1 is connected to Ground.