simulink realtime(xpc)调用pci1724输出电压时串口相互影响

在使用simulink realtime(xpc)调用pci1724输出电压时，给某一端口电压值，结果所有端口都输出了这一电压值。查看了手册，是没有办法实现给不同端口不通电压值吗？

赋值代码如下：

rl32eOutpB((unsigned short)0xD004,0);           /* 直接输出*/  
    for (i=0;i<8;i++) { 
		if (i == 0) {
			y = ssGetInputPortRealSignalPtrs(S, 0);
			x = (int)(*y[0] * 204);
			rl32eOutpDW((unsigned short)0xD000, (unsigned short)(int)(1105921 + x * 2));
		}
		else if (i == 1) {
			y = ssGetInputPortRealSignalPtrs(S, 1);
			x = (int)(*y[0] * 204);
			rl32eOutpDW((unsigned short)0xD000, (unsigned short)(int)(1171457 + x * 2));
		}
		else if (i == 2) {
			y = ssGetInputPortRealSignalPtrs(S, 2);
			x = (int)(*y[0] * 204);
			rl32eOutpDW((unsigned short)0xD000, (unsigned short)(int)(1236993 + x * 2));
		}
		else if (i == 3) {
			y = ssGetInputPortRealSignalPtrs(S, 3);
			x = (int)(*y[0] * 204);
			rl32eOutpDW((unsigned short)0xD000, (unsigned short)(int)(1302529 + x * 2));
		}
		else if (i == 4) {
			y = ssGetInputPortRealSignalPtrs(S, 4);
			x = (int)(*y[0] * 204);
			rl32eOutpDW((unsigned short)0xD000, (unsigned short)(int)(1368065 + x * 2));
		}
		else if (i == 5) {
			y = ssGetInputPortRealSignalPtrs(S, 5);
			x = (int)(*y[0] * 204);
			rl32eOutpDW((unsigned short)0xD000, (unsigned short)(int)(1433601 + x * 2));
		}
		else if (i == 6) {
			y = ssGetInputPortRealSignalPtrs(S, 6);
			x = (int)(*y[0] * 204);
			rl32eOutpDW((unsigned short)0xD000, (unsigned short)(int)(1499137 + x * 2));
		}
		else {
			y = ssGetInputPortRealSignalPtrs(S, 7);
			x = (int)(*y[0] * 204);
			rl32eOutpDW((unsigned short)0xD000, (unsigned short)(int)(1564673 + x * 2));
		}
	}

说明手册描写如下：

你好，我是有问必答小助手，非常抱歉，本次您提出的有问必答问题，技术专家团超时未为您做出解答

本次提问扣除的有问必答次数，已经为您补发到账户，我们后续会持续优化，扩大我们的服务范围，为您带来更好地服务。

您好，解决了么？我们实验室现在也在用xpc调用，和您出现了一样的情况

我有写好的验证成功的PCI1711的DA和AD驱动 可以交流