Omron CJ1W-SCU22, Руководство по эксплуатации, Страница: 454 / 478

A Standard System Protocol
R-120
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
When this protocol is used, it is required that the modem connected to the Serial Communications
Unit/Board be initialized to the following conditions:
Additional Information
• It is recommended that, in addition to the above settings, the abort timer should be set so that
communications are cut off if a communications error happened due to incidents such as
cable disconnection between the Serial Communications Unit/Board and modem. The abort
timer is set to 10 minutes for the modem initialization (specialized) (Sequences No. 560,
No. 570, No. 580:
Initialize Modem (Specialized)). Refer to modem's manual for further infor-
mation about abort timers.
• The data format of the modem (baud rate, data length, parity, stop bit) is set by AT commands
issued from a device connected to the modem. Its settings should conform to communications
conditions of the device which issues AT commands. Therefore when communications are
made between the modem and Serial Communications Unit/Board, it is required that commu-
nications conditions should be set by issuing AT commands from the Serial Communications
Unit/Board.
• Modem settings become invalid if the power supply is turned off and must be set again. How-
ever, a memory backup function can be used to protect settings so that even after the power
supply to the modem is turned off, it can communicate with the previous setting conditions.
Refer to the modem manual for how to save settings.
For Initialize Modem (specialized), the modem initialization command is built in as message data. How-
ever, for Initialize Modem (general-purpose), the command must be specified in the send data for
PMCR(260). The PMCR instruction operand and send data word settings are specified below for when
Initialize Modem (general-purpose) (Sequence No. 550) is executed.
Setting Example for Modem Initialization Command
• MD24FB10V Using Sequence #550 (OMRON)
R-6-4 Modem Settings
Command echo No
Result code display format Numeric format
Speed display, busy/dialling tone detection at connec-
tion Baud rate display enabled, busy and dialling tone
detection enabled.
Error correction data compression display Error correction/data compression display enabled
MNP setting Error correction provided (auto-reliable mode)
MNP class setting MNP class 4
V.42 compression, Error correction Not enabled
Flow control between terminal modems Not enabled
ER signal control Always ON
Escape code +
OPR 1 (Communications port settings)
OPR 2 #0226 (Sequence No. 550)
OPR 3 Address S for first word containing initialization command character string
OPR 4 None (Set #0000)
S+0 Number of words from address set for operand 2 to end of data 4 digits Hex
S+1 Number of bytes for send data (initialization command) 4 digits Hex
S+2
:
S+n Send data (initialization command)
(Fill data to left for odd numbers of bytes) ASCII