6. SPECIFICATION OF INPUTS AND OUTPUTS
6.10.2 Functional description
The RS-232 interface is a RS-232 compatible asynchronous full duplex serial interface. No handshake
lines (like RTS or CTS) are provided.
Figure 7: RS-232 interface wiring
Note that a proper ground connection is necessary for the RS-232 operation. It is recommended to use
the RS-232 GND pin for this purpose. When connecting with an external device (for example, a PC with
RS-232 interface) make sure that the maximum voltage ratings are not violated.
6.10.3 Maximum ratings
Symbol Parameter Min Max Unit
V
RS-232_TxD
,
V
RS-232_RxD
Bus voltage under overload conditions (that is, short circuit to
supply voltages)
-15 33 V
6.10.4 Characteristics
Symbol Parameter Min Max Unit
C
out
Pin output capacitance 100 200 pF
V
IL
Input voltage for low level -15 +0.8 V
V
IH
Input voltage for high level +2.7 +15 V
R
pd
Input resistor (to GND) 5 9 kΩ
V
OL
Output voltage for low level -9 -5 V
V
OH
Output voltage for high level +5 +9 V
S
Tr
Data rate 115 kBd
© TTControl GmbH 2020. All rights reserved.
Confidential and Proprietary Information
25
Document Number:
D-156-G-02-001
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