Cinterion MC55i - RS-232 Interface; Table 18: RS-232 Interface Specifications (Requirements)

MC55i Terminal Hardware Interface Description
4.4 Electrical Specifications of the Application Interface
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MC55i_Terminal_HD_v01.201a Page 37 of 47 2010-04-16
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4.4.2 RS-232 Interface
Table 18: RS-232 interface specifications (requirements)
Parameter Description Conditions Min. Typ Max. Unit
V
OUT
Transmitter output volt-
age for
/RXD, /CTS, /DSR, /
DCD, /RING
@ 3kOhm load ±5 ±6 ±7 V
R
OUT
Transmitter output
resistance
/RXD, /CTS, /DSR, /
DCD, /RING
300 Ohm
R
IN
Resistance
/TXD, /RTS, /DTR
357kOhm
V
In
Receiver input voltage
range
/TXD, /RTS, /DTR
-15 +15 V
V
RIHYS
Input hysteresis 0.2 0.5 1 V
V
Ilow
Input threshold low 0.8 1.2 V
V
Ihigh
Input threshold high 1.7 2.8 V
Baudrate Autobauding 1.2 115 kbps
Fixed range 0.300 115 kbps
LE
Cable
Length of RS-232 cable 1.8 2 m