Oki OKIPAGE 10e Service Manual page 189

Loop Test (RS-232C Interface)
1) Connect the test connector
Printer side: 25-pin receptacle
l
Type DB-25S (made by Canon) or equivalent
Cable side: 25-pin plug
l
Type DB-25S (made by Canon)
Shell
Type DB-C8-J10-F2-1 (made by Nihon Kouku Denshi) or equivalent
Note: Plug shall be fixable with a lock screw.
2) Cable
Cable length: 6 ft (1.8 m) max. (cable shall be shielded)
Note: Cable is not provided.
3) Interface signal
Pin No. Signal Name
1 Frame Ground
2 Transmitted Data
3 Received Data
4 Request To Send
5 -
6 -
7 Signal Ground
9~17 -
18
19 -
20 Data Terminal Ready
21~25 -
Connector pin arrangement
l
(4) Signal level
MARK polarity: -3V to -15 V (LOGIC = 1)
l
SPACE polarity: +3 V to +15 V (LOGIC =0)
l
(5) Interface Circuit
a) Receiving Circuit
Service Guide OKIPAGE 10e
Chapter A Loop Test (RS-232C Interface)
Signal Direction Compatible
FG
TD <-- PR
RD --> PR
RTS <-- PR
SG
DTR <-- PR
Nibble
Frame ground
Transmitted data
Received data
Stay space level
(Not connected)
(Not connected)
Signal ground
(Not connected)
(Not connected)
(Not connected)
Data terminal ready
(Not connected)
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