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8-6-2 Communications Board Settings
The following parameters must be set in advance in order to use the Protocol
Macro function through a Communications Board.
Communications Mode
Set the communications mode to Protocol Macro mode.
Port B: Set bits 12 through 15 of DM 6550 to 6.
Port A: Set bits 12 through 15 of DM 6555 to 6.
Standard Port Settings
Standard settings or custom settings can be used for ports A and B. The stan-
dard settings are used when the following bits are set to 0.
Port B: Bits 00 through 03 of DM 6550 (0: standard; 1: custom).
Port A: Bits 00 through 03 of DM 6555 (0: standard; 1: custom).
The standard settings are shown in the following table.
Item Setting
Start bits 1
Data length 7
Stop bits 2
Parity Even
Baud rate 9,600 bps
Custom Port Settings
Standard settings or custom settings can be used for ports A and B. The custom
settings are used when the following bits are set to 1.
Port B: Bits 00 through 03 of DM 6550 (0: standard; 1: custom).
Port A: Bits 00 through 03 of DM 6555 (0: standard; 1: custom).
The custom settings for Port B are defined in DM 6551 and the custom settings
for the Port A are defined in DM 6556.
Transmission Frame Format (See table below.)
Baud rate (See table below.)
15 0
Bit
DM 6551:Port B
DM 6556:Port A
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
The Protocol Macro Function
Section 8-6