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ATSEL HMI User Manual
COM port connection
For SP112, COM port includes RS232 and RS485. The pins set up as below, pin 7/8 for
RS485 and pin 2/3/5 for RS232.
As for 4 Points terminal, A is set for RS485+
,
B RS485-, R is when using built-in 120Ω
resistance then to short connection R and A, it will be convenient for long-distance
communication.
Remark
:
the pluggable terminal COM1 and the DB9 COM1 share the same RS485
series port, thus they can’t be used at the same time.
HMI
DB9 Male
Pluggable terminals
picture
interface
PIN
Pin Definition
interface
PIN
Pin definition
remark
picture
SP112
COM2
1
——
COM1
1
R
120Ω resistance
2
RS232 RXD
2
A
RS485+(A)
3
RS232 TXD
3
B
RS485-(B)
4
——
4
PE
Shielded ground
5
GND
remark
:
The pluggable terminal COM1 and the DB9
COM1 share the same RS485 serial port.
COM1
6
——
7
RS485+(A)
8
RS485-(B)
9
——