Hitachi 902 - RS-232 C Communication; Connector Position; Connecting Cable and Cable Length; 20 Ma Current Loop Interface Signal Level and Meaning

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Table 16-2920 mA Current Loop Interface Signal Level and Meaning
Signal
Current ON (20 mA) Current OFF (0 mA)
TXD
RXD
•MARK
•Stop bit
•Data 1
•SPACE
•Stop bit
•Data 0
CTS •OFF
•Data 0
•Data transfer prohibited
•ON
•Data 1
•Data transfer allowed
RTS •OFF
•Data 0
•ON
•Data 1
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.
Signal Name