Manual

ALTOSONIC V
ModBus Manual 0300 rev07 E 7.30855.35.00 Page 22 of 64
7.2.2 RS485/422 card: PCL-745 S
The current generation RS485/422 card
Dip switch ch1*** : COM 3 Address 3E8 (Krohne Altometer setting)
Dip switch ch2*** : COM4 Address 2E8
JP1*** : Interrupt COM3 IRQ4
JP2*** : Interrupt COM4 IRQ3
JP4*** : Transmit driver enable COM3 always RTS
JP5 : Transmit driver enable COM4 default RTS
JP6*** : Receive COM3 (422 is always on)
JP7*** : Terminator jumper COM3 120
JP8*** : Terminator jumper COM3 always not installed
JP9*** : Receive COM4 (422 is always on)
JP10*** : Terminator jumper COM4 120
JP11 : Terminator jumper COM4 (120 for RS422 mode, not installed for RS485 mode)
***(=Krohne Altometer setting)
NOTE:
JP6 and JP9 are always 422 because the receiver is for both RS485 mode and RS422 mode expected to be enabled for the
UFP-Program.
RS485 mode and RS422 mode for COM4 (Modbus) therefore only differs in set up by:
- Jumper JP11 not installed (RS485) or installed on 120 (RS422)
- The external wiring for RS422 and RS485
External wiring PCL745 for Modbus: