PSB Speakers PSB-1688LF M1 - Manual (Page 18)

Chapter 2 Hardware Configuration
PSB-1688LF USER
′
S MANUAL Page: 2-7
2-5. RS232/422/485 (COM2) SELECTION
JP2 : RS-232/422/485 (COM2) Selection
The COM2 Function selections are as follows :
COM 2
Function
Jumper
Settings
(pin closed)
Jumper
Illustrations
RS-232
Open
JP2
19
20
1
2
RS-422
1-2, 5-6, 7-8
9-10, 11-12,
13-14, 15-16
17-18, 19-20
JP2
19
20
1
2
RS-485
1-3, 4-6, 7-8
9-10, 11-12
13-14, 15-16
17-18, 19-20
JP2
19
20
1
2
*** Manufactory default --- RS-232.
 To select RS422 or RS485, COM2 must be set at RI function.