B. Specifications
124
J1 Peripheral Pinout (continued)
Pin
Signal
Type
Description
Pin
Signal
Type
Description
13
COM3 RXD
In
Receive Data
53
PD2
In/Out
Data 2
14
COM3 RTS
Out
Request To Send
54
/SLIN
Out
Select To Printer
15
COM3 TXD
Out
Transmit Data
55
PD3
In/Out
Data 3
16
COM3 CTS
In
Clear To Send
56
GND
------
Ground
17
COM3 DTR
Out
Data Terminal Ready
57
PD4
In/Out
Data 4
18
COM3 RIN
In
Ring Indicator
58
GND
------
Ground
19
GND
------
Ground
59
PD5
In/Out
Data 5
20
VCC
Out
+5V
60
GND
------
Ground
21
COM2 DCD
In
Data Carrier Detect
61
PD6
In/Out
Data 6
22
COM2 DSR
In
Data Set Ready
62
GND
------
Ground
23
COM2 RXD
In
Receive Data
63
PD7
In/Out
Data 7
24
COM2 RTS
Out
Request To Send
64
GND
------
Ground
25
COM2 TXD
Out
Transmit Data
65
/ACK
In
Acknowledge
26
COM2 CTS
In
Clear To Send
66
GND
------
Ground
27
COM2 DTR
Out
Data Terminal Ready
67
BUSY
In
Busy
28
COM2 RIN
In
Ring Indicator
68
GND
------
Ground
29
GND
------
Ground
69
PE
In
Paper Error
30
VCC
Out
Power
70
GND
------
Ground
31
COM1 DCD
In
Data Carrier Detect
71
SLCT
In
Select From Printer
32
COM1 DSR
In
Data Set Ready
72
TXDA+
Out
COM1 Transmit
Data +
33
COM1 RXD
In
Receive Data
73
TXDA-
Out
COM1 Transmit
Data -
34
COM1 RTS
Out
Request To Send
74
RXDA+
In
COM1 Receive
Data +
35
COM1 TXD
Out
Transmit Data
75
RXDA-
In
COM1 Receive
Data -
36
COM1 CTS
In
Clear To Send
76
GND
------
Ground
37
COM1 DTR
Out
Data Terminal Ready
77
TXDB+
Out
COM2 Transmit
Data +
38
COM1 RIN
In
Ring Indicator
78
TXDB-
Out
COM2 Transmit
Data -
39
GND
------
Ground
79
RXDB+
In
COM2 Receive
Data +
40
VCC
Out
Power
80
RXDB-
In
COM2 Receive
Data -
