50
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Input voltage level +5 V to +15 V: ON, -15 V to -5 V: OFF
Output voltage level
(Load resistance 3 to 7
kΩ)
+5 V to +9 V: ON, -9 V to -5 V: OFF
12345
6789
Pin Signal IN/OUT Purpose
2 RxD IN Receiving
data
3 TxD OUT Sending
data
5 GND GND Signal
grounding
Do not use other pins.
(2) Electric specifications
3237/38/39 RS-232C connector signal lead is set as follows.
Other pins are not in use.
Interface connector: D-sub 9 pin, male
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