69
English
8-4. RS-232C Interface
1. Signals (Conforming to EIA-RS-232C)
Signals : Asynchronous, start-stop system,
full duplex system
Data signalling rate : 600, 1200,
2400, 4000, 9600,
19200 bps
Data length : Switchable between 7 or 8 bits
Stop bits : Switchable between
1 or 2 stop bits
Cable length : Max.15 m
Parity : None, odd, or even selectable.
• Switching of the various parameters is performed in
the initial settings (P54).
• The above underlined items are the settings at the
time of shipping.
2. Electrical Specifications
Driver side : Using MAX232 or equivalent
product
Amplitude of output voltage
: ±5 to 10 V
Output resistance : 300 Ω or more
Output short-circuit current
: ±10 mA
Receiver side : Using MAX232 or equivalent
product
Input resistance : 3 to 7 kΩ
Input allowable voltage : ±30 V
Input threshold : Low 1.2 V/High 1.7 V
8-3. Connecting a personal computer
Use a DZ252 or DZ253A RS-232C cable (sold seperately)
for connecting personal computers.
(See P71 “8-7. Commands”.)
Note
The shielded cables of the DZ252 and DZ253A connectors are connected
to FG of LT20.
The DZ252 and DZ253A connectors for the personal computer side are 9 and
25-pin Dsub connectors, respectively. Please check the form of the personal
computer’s RS-232C connector before purchasing the cable for
connection. For further information please consult your dealer.
Connection
Pin No.
1
2
3
4
5
6
7
8
Case
Pin No.
1
2
3
4
5
6
7
8
9
Case
Pin No.
1
2
3
4
5
6
7
8
Case
Pin No.
1
2
3
4
5
6
7
to
25
Case
9pin Dsub
25pin Dsub
8pin mini DIN8pin mini DIN
DZ252 DZ253A
Personal
computer side
Personal
computer side
Shield
cable
Shield
cable
LT20 side
LT20 side
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