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n
描述
当ET 200S 1SI 模板用于RS 232C通信时除参数可自动设置外也可使用S_V24指令对参数进行额外的设置。n
S_V24 指令有以下输入参数。
n
| 输入参数 | 数据类型 | 描述 |
| REQ | BOOLEAN | 上升沿触发 |
| R | BOOLEAN | 任务放弃 当前任务被放弃，发送被阻隔。 |
| LADDR | INT | ET 200S 1 SI模板的起始地址 |
| TIME_RTS_OFF | TIME | 在传输之后RTS信号关断之前逝去的时间。 值范围: 0ms 到 10min 55s 350ms 缺省值: 10ms |
| DATA_WAIT_TIME | TIME | 在RTS置位之后等待对方将CTS=ON所需时间。 值范围: 0ms to 10min 55s 350ms 缺省值: 10ms |
| COM_RST | BOOLEAN | 重启 |
S_V24 指令有以下输出参数。
n
| 输出参数 | 数据类型 | 描述 |
| DONE | BOOLEAN | 任务执行完毕，无错误。 STATUS = 16#00 |
| ERROR | BOOLEAN | 任务执行出错，终止。 错误信息参见STATUS参数信息 |
| STATUS | WORD | ERROR=1出错信息参见STATUS参数信息 |
指令
当参数化 S_V24 指令时，必须注意输入参数"TIME_RTS_OFF"的设置。
如果数据传输波特率低 (<4800),RTS OFF 的时间计算错误并且RTS信号会提前关断。因此，必须根据数据传输波特率更正输入参数TIME_RTS_OFF的值。根据每个字节长度增加传输时间。
例如
数据传输波特率为 2400 bit/s时传输一个字节（8位）所需时间为3.33ms。.
因此，对于数据传输波特率为2400 bit/s，每增加一个字节输入参数 TIME_RTS_OFF应该增加4ms。
计算公式
传输时间 = (1000ms * 8 bits) / 2400 bits = 3.33ms.
Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in D:\wwwroot\www.zhaoplc.com\wp-includes\class-wpdb.php on line 2357
Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in D:\wwwroot\www.zhaoplc.com\wp-includes\class-wpdb.php on line 2357
Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in D:\wwwroot\www.zhaoplc.com\wp-includes\class-wpdb.php on line 2357
Warning: mysqli_query(): (HY000/1194): Table 'wp_options' is marked as crashed and should be repaired in D:\wwwroot\www.zhaoplc.com\wp-includes\class-wpdb.php on line 2357
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