Hioki DM7275 Series - Page 103

101
Preparing to Use an Interface (Connection and Settings)
(3) Connect the RS-232C cable.
Before connecting the RS-232C cable, read “Before connecting the communication cables” (p. 10)
and “Before connecting to the RS-232C or GP-IB connectors” (p. 11) carefully.
Connect the RS-232C cable to the RS-232C connector. When connecting the cable, be sure to
tighten the fastening screws.
RS-232C cable
Computer’s
RS-232C interface
1 2 3 4 5
6 7 8 9
D-sub 9-pin male with
fastening screw #4-40
• When connecting the instrument to an external
device (DTE), use a crossover cable that satises
the specications of the instrument’s connector
as well as the external device’s connector.
• The I/O connector implements terminal (DTE)
specications.
• The instrument uses pin numbers 2, 3, and 5.
Other pins are unused.
Pin no.
Signal name
Signal Remarks
Common
name
EIA JIS
1 DCD CF CD Data carrier detect Not connected
2 RxD BB RD Receive data
3 TxD BA SD Transmit data
4 DTR CD ER Data terminal ready Fixed ON level (+5 to +9 V)
5 GND AB SG Signal ground
6 DSR CC DR Data set ready Not connected
7 RTS CA RS Send request Fixed ON level (+5 to +9 V)
8 CTS CB CS Clear to send Not connected
9 RI CE CI Ring indicator Not connected
When connecting the instrument to a computer
Use a D-sub 9-pin male to D-sub 9-pin male crossover cable.
D-sub 9-pin male
Instrument
D-sub 9-pin male
Computer (AT-compatible)
Pin no. Pin no.
DCD 1 1 DCD
RxD 2 2 RxD
TxD 3 3 TxD
DTR 4 4 DTR
GND 5 5 GND
DSR 6 6 DSR
RTS 7 7 RTS
CTS 8 8 CTS
9 9
Recommended cable: Hioki 9637 RS-232C Cable (1.8 m)
8
Preparing to Use USB, RS-232C, GP-IB, and LAN Control
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