SENA Parani-ESD100V2-110V2 - Manual (Page 38)

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A.2.1.2. When TTL level of MICOM is 3.3V and Hardware Flow Control is not used
MICOM
MICRO-VDD
MICOM-RXD
MICOM-RST
TXD
RXD
CTS
RTS
RST
DTR
DSR
MICOM-TXD
MICOM-GND
VDD
GND
DCD
DC 3.3V
PARANI-ESD
A.2.1.3. When TTL level of MICOM is 5V
MICOM
MICRO-VDD
MICOM-RXD
MICOM-CTS
MICOM-RTS
MICOM-RST
MICOM-DTR
MICOM-DSR
TXD
RXD
CTS
RTS
RST
DTR
DSR
MICOM-TXD
MICOM-GND
VDD
GND
MICOM-DCD DCD
DC 3.3V
68K  115K 
68K  115K 
68K  115K 
68K  115K 
DC 5V
PARANI-ESD