Computer Hardware User Manual

421
Custom Port Settings
Standard settings or custom settings can be used for the RS-232C and peripher-
al ports. The custom settings are used when the following bits are set to 1.
RS-232C port: Bits 00 through 03 of DM 6645 (0: standard; 1: custom).
Peripheral port: Bits 00 through 03 of DM 6650 (0: standard; 1: custom).
The custom settings for the RS-232C port are defined in DM 6646 and the cus-
tom settings for the peripheral port are defined in DM 6651.
The following settings are valid only when pin 5 on the CPU Unit’s DIP switch is
turned OFF. Be sure to set the communications parameters to the same settings
for both ends of the communications.
Transmission Frame Format (See table below.)
Baud rate (See table below.)
15 0
Bit
DM 6646:RS-232C port
DM 6651:Peripheral port
Parameter Setting Start bits Data length Stop bits Parity
Transmission Frame
00 1 7 1 Even
Format
01 1 7 1 Odd
02 1 7 1 None
03 1 7 2 Even
04 1 7 2 Odd
05 1 7 2 None
06 1 8 1 Even
07 1 8 1 Odd
08 1 8 1 None
09 1 8 2 Even
10 1 8 2 Odd
11 1 8 2 None
Parameter Setting Baud rate
Baud rate
00 1,200 bps
01 2,400 bps
02 4,800 bps
03 9,600 bps
04 19,200 bps
Transmission Delay Time
Depending on the devices connected to the RS-232C port, it may be necessary
to allow time for transmission. When that is the case, set the transmission delay
to regulate the amount of time allowed. The transmission delay time is set in
units of 10 ms.
RS-232C port: Set DM 6647 from 0000 to 9999 (0 to 99.99 s delay).
Peripheral port: Set DM 6652 from 0000 to 9999 (0 to 99.99 s delay).
Host Link Communications
Section 8-2