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CHAPTER 5: Conversions and Connections
UNASSIGNED EBCDIC CODE
04 2B 46 58 71 8D AB B7 CE ED
08 30 47 59 72 8E AC B8 CF EF
09 31 48 62 73 8F AE B9 DA FA
17 34 49 63 74 90 AF BA DB FB
1A 38 51 64 75 9A B0 BB DC FC
20 3B 52 65 76 9C B1 BC DD FD
21 3E 53 66 77 9D B2 BE DE FE
23 42 54 67 78 9E B3 BF DF FF
24 43 55 68 80 9F B4 CB EA
28 44 56 69 8A A0 B5 CC EB
2A 45 57 70 8C AA B6 CD EC
5.5 PRINTED CIRCUIT BOARD LAYOUT
Figure 5-2. Printed Board Circuit Layout.
TXD
A
RXD
A
RTS
A
CTS
A
DTR
A
DSR
A
CDA
A
CDB
TXD
B
RXD
B
RTS
B
CTS
B
DTR
B
DSR
B
TXC
B
RXC
B
PWR
ON
SW3
18
ON
SW2
18
ON
SW1
18
DSR A DSR B R1
U7
U8
U9
28 64
EPROM
U12 U16
6116 6264
U13
DETECT
CDA
DETECT
CDB
CAR A
ENB
CD
ENB
CAR B
A
CARR
CNT
ON CNT CARR B
ON
CTS A
ON CNT
U18
U19
U20
U17 U21
XTAL
ON
B
CTS
CNT
EXT
U25
U26
CNT ON
DTR B
U24
U23
U22
CNT
DTR
A
U27
U28
U29
U30
DCE-A
DCE-B
DTE-A
DTE-B
SME
B
SME
B
EXT B
DTR
DSR
PORT B
DB25
PORT A
DB25
OPT
SW4
RESET
P1
EARTH
GND
11VAC
C. T.
11VAC
31