Rs-232C Communication; Connector Position; Connecting Cable And Cable Length; 20 Ma Current Loop Interface Signal Level And Meaning - Hitachi 902 Service Manual

Table 16-29 20 mA Current Loop Interface Signal Level and Meaning
Signal Name
• MARK
TXD
• Stop bit
RXD
• Data 1
• OFF
CTS
• Data 0
• Data transfer prohibited
• OFF
RTS
• Data 0
NOTE: Data 0 and data 1 correspond to decimal numbers for the CPU to read/write data, respectively.

16.9.4 RS-232C Communication

(1)

Connector Position

Use the connector J402 on the rear panel of Model 902.
(2)

Connecting Cable and Cable Length

J402 uses a 15-pin interface connector (female).
On the cable side, use the following.
HDAB-15P (made by Hirose Denki)
Cable length is limited to 15 m at maximum.
(3) Pin Arrangement
Refer to (3) of 16.9.2.
Current ON (20 mA)
16 - 48
Signal
Current OFF (0 mA)
• SPACE
• Stop bit
• Data 0
• ON
• Data 1
• Data transfer allowed
• ON
• Data 1