Saia-Burgess
Controls Ltd.
Manual PCD7.D23x│Document 26/795; Edition E7│15.04.2005
Communication
3
3-1
Serial mode
3
Communication mode setting
3.1
Serial mode – Baudrate and Controls
The selected PCD communication mode and PCD7.D23x communication settings in
the setup menu must match.
The PCD communication mode (MC0/1/2/4/5) is selected in the HMI using the HMI
set-up screen:
●
MC0: Duplex, No handshake, with optional manual RTS/CTS use on RS232
●
MC1: Duplex, Automatic Hardware (RTS/CTS) Handshake, RS232 only
●
MC2: Duplex, Software Handshake (XON / XOFF)
●
MC4: Half duplex for RS485 / 422, and for RS232 with RTS transmit direction
control
●
MC5: MC4 mode for devices with reduced turn-around delay (Fast RS485).
The PCD7.D2xx communication modes are set in the set-up menu:
●
RS232 RTS/CTS: Duplex, Full Hardware Handshake (RS232 only)
●
RS232 None: Duplex RS232 with RTS only, no Handshake on RS422
●
RS422/232 XON/XOFF: Duplex full handshake
●
RS422/232 XON/XOFF(R): Duplex XON/XOFF Reduced
●
RS485 FTP: Half duplex Free Terminal Protocol
●
RS422 FTP Multi-drop: Half duplex Free Terminal Protocol
In the reduced handshake modes the PCD7.D23x receive buffer is protected for
receive buffer overflow by the RTS detection on the CTS input of the PCD, or XON/
XOFF reception control on the PCD, but the PCD receive buffer goes unproteced.
In the XON/XOFF full protocol the XON/XOFF reception requires special escape
parsing (XON: ESC-[, XOFF : ESC-], ESC: ESC-ESC) in the PCD transmission and
reception.
3.1.1 Standard modes (available with D23x, FW 25)
RS 232
(with or without handshake)
Baudrate
Type Handshake
Control
Graphic support (HMI)
4800/9600 bps
MC0
without
None
No
4800/9600/19200 bps MC1
with
RTS/CTS *
Yes
4800/9600 bps
MC2
with
XON/XOFF
No
*Recommended in the most applications RS 232 (with handshake)
RS 422
(with handshake)
Baudrate
Type Handshake
Control
Graphic support (HMI)
4800/9600 bps
MC2
with
XON/XOFF
No
RS 485 Free Terminal Protocol
(without handshake)
Baudrate
Type Handshake
Control
Graphic support (HMI)
4800/9600 bps
MC4(5)
without
-
No