diff --git a/apps/chrg/applications/thread/chrg_comm.c b/apps/chrg/applications/thread/chrg_comm.c
index c229dcf..d442c1f 100644
--- a/apps/chrg/applications/thread/chrg_comm.c
+++ b/apps/chrg/applications/thread/chrg_comm.c
@@ -27,7 +27,7 @@
 #include "stm32f4xx_hal.h"
 
 #define HOLD_REG_FIRMWARE_VERSION 0x0300U /* 协议板固件版本，只读 */
-#define CHRG_FIRMWARE_VERSION     0x0147U /* 当前协议板版本：V1.1.55 */
+#define CHRG_FIRMWARE_VERSION     0x0148U /* 当前协议板版本：V1.1.56 */
 
 
 rt_uint8_t ucDiscInBuf[(TOTAL_DISC_REGS+BITS_UCHAR-1)/BITS_UCHAR];
@@ -1735,6 +1735,18 @@ static void chrg_mb_write_sink(rt_uint8_t ch, rt_uint16_t reg_offset, rt_uint16_
     case SINK_REG_DYNA_UNLOAD:      // 0x1E: 卸载斜率
         pSW->sink.test.change_test.k_Fall = sou_value;
         break;
+    case SINK_REG_DPDM_DZ_K:        // D+ K，实际比例系数放大10000倍
+        pSW->sink.dpdm_cal.dz_k = sou_value;
+        break;
+    case SINK_REG_DPDM_DZ_B:        // D+ B，单位0.01V，有符号16位
+        pSW->sink.dpdm_cal.dz_b = (rt_int16_t)sou_value;
+        break;
+    case SINK_REG_DPDM_DF_K:        // D- K，实际比例系数放大10000倍
+        pSW->sink.dpdm_cal.df_k = sou_value;
+        break;
+    case SINK_REG_DPDM_DF_B:        // D- B，单位0.01V，有符号16位
+        pSW->sink.dpdm_cal.df_b = (rt_int16_t)sou_value;
+        break;
     default:
         rt_kprintf("[SINK CH%d] Unknown reg offset=0x%02X\n", ch + 1, reg_offset);
         break;
@@ -1868,6 +1880,16 @@ static rt_bool_t chrg_comm_sink_config_equal(const struct chrg_switch_t *a,
 			sizeof(a->sink.test.change_test)) == 0);
 }
 
+/* D+/D-校准参数为独立北向事务，不并入普通负载状态机配置比较。 */
+static rt_bool_t chrg_comm_sink_dpdm_cal_equal(const struct chrg_switch_t *a,
+	const struct chrg_switch_t *b)
+{
+	return (a->sink.dpdm_cal.dz_k == b->sink.dpdm_cal.dz_k) &&
+		(a->sink.dpdm_cal.dz_b == b->sink.dpdm_cal.dz_b) &&
+		(a->sink.dpdm_cal.df_k == b->sink.dpdm_cal.df_k) &&
+		(a->sink.dpdm_cal.df_b == b->sink.dpdm_cal.df_b);
+}
+
 /*****************************************************************
 函数名称： chrg_comm_copy_sink_config
 函数描述： 将PC配置逐项应用到Sink，保留实际运行状态、旧测试模式和量测
@@ -2373,6 +2395,27 @@ static eMBException chrg_mb_write_sys(rt_uint8_t ch, rt_uint16_t reg_offset,
 			}
 			status = (switch_ret == 0) ? MB_EX_NONE : MB_EX_SLAVE_BUSY;
 		} else if (new_id == ID_SINK) {
+			/*
+			 * D+/D-校准参数不是负载工作参数：上位机依次写入四个保持寄存器后，
+			 * 必须单独写PARAM_EFFECT提交。若同时改了协议、CC或带载参数，
+			 * 本次拒绝提交，避免校准写入抢占正在进行的负载状态机。
+			 */
+			if (!chrg_comm_sink_dpdm_cal_equal(pReal, pSW)) {
+				if (!chrg_comm_sink_config_equal(pReal, pSW)) {
+					status = MB_EX_SLAVE_BUSY;
+				} else if (chrg_roll_nor_sink_dpdm_cal_submit(ch, pReal,
+					&pSW->sink.dpdm_cal) != 0) {
+					status = MB_EX_SLAVE_BUSY;
+				} else {
+					pNOR->config_version[ch]++;
+					status = MB_EX_NONE;
+				}
+				if (status != MB_EX_NONE) {
+					g_shadow_dirty[ch] = 1;
+				}
+				rt_mutex_release(pTHR_NOR->mutex);
+				return status;
+			}
 			sink_config_changed = !chrg_comm_sink_config_equal(pReal, pSW);
 			old_sink_sub = pReal->sub;
 			old_sink_on = pReal->sink.On_work;
diff --git a/apps/chrg/applications/thread/chrg_north.c b/apps/chrg/applications/thread/chrg_north.c
index 9cf20ed..a8389b7 100644
--- a/apps/chrg/applications/thread/chrg_north.c
+++ b/apps/chrg/applications/thread/chrg_north.c
@@ -429,6 +429,7 @@ static rt_bool_t chrg_north_frame_shape_valid(eIDX_ID id,
 	if (id == ID_SINK) {
 		switch (command) {
 		case SINK_CMD_RESET:
+		case SINK_CMD_SET_DPDM_CAL:
 		case SINK_CMD_SET_CC:
 		case SINK_CMD_SET_LEVEL:
 		case SINK_CMD_SET_QC20:
@@ -445,7 +446,9 @@ static rt_bool_t chrg_north_frame_shape_valid(eIDX_ID id,
 		case SINK_CMD_SET_VOOC:
 		case SINK_CMD_SET_AVS:
 		case LOAD_PRO_NONE:
-			return (length == MIN_FRAME_LENGTH) ? RT_TRUE : RT_FALSE;
+			return (command == SINK_CMD_SET_DPDM_CAL) ?
+				((length == 6U) ? RT_TRUE : RT_FALSE) :
+				((length == MIN_FRAME_LENGTH) ? RT_TRUE : RT_FALSE);
 		default:
 			return RT_FALSE;
 		}
diff --git a/apps/chrg/applications/thread/chrg_north.h b/apps/chrg/applications/thread/chrg_north.h
index 619eabf..e505e3c 100644
--- a/apps/chrg/applications/thread/chrg_north.h
+++ b/apps/chrg/applications/thread/chrg_north.h
@@ -16,7 +16,7 @@
 #include "chrg_def.h"
 
 /* V_On启停判定电压源：切换后需重新编译固件。 */
-#define SINK_VON_VOLTAGE_FROM_PROTOCOL  6U
+#define SINK_VON_VOLTAGE_FROM_PROTOCOL  1U
 #define SINK_VON_VOLTAGE_FROM_POWER     2U
 #ifndef SINK_VON_VOLTAGE_SOURCE
 #define SINK_VON_VOLTAGE_SOURCE         SINK_VON_VOLTAGE_FROM_POWER
diff --git a/apps/chrg/applications/thread/chrg_roll_nor.c b/apps/chrg/applications/thread/chrg_roll_nor.c
index 9fbcd43..d0452bd 100644
--- a/apps/chrg/applications/thread/chrg_roll_nor.c
+++ b/apps/chrg/applications/thread/chrg_roll_nor.c
@@ -61,6 +61,17 @@ static rt_uint8_t g_sink_reset_next_sub[TOTAL_NOR_CHS] = {0};
 /* 仅CC参数实际变化的通道才会断开D+/D-/CC，并在CC稳定后恢复。 */
 static rt_uint8_t g_sink_cc_relay_close_mask = 0U;
 static rt_uint8_t g_sink_cc_relay_restore_mask = 0U;
+/* D+/D-校准写入任务按通道独立保存，避免与普通0x20轮询共用参数缓存。 */
+struct sink_dpdm_cal_job_t {
+	struct sink_dpdm_cal_t cal;
+	rt_bool_t pending;
+	rt_uint8_t status;
+};
+#define SINK_DPDM_CAL_STATUS_IDLE     0U
+#define SINK_DPDM_CAL_STATUS_PENDING  1U
+#define SINK_DPDM_CAL_STATUS_SUCCESS  2U
+#define SINK_DPDM_CAL_STATUS_TIMEOUT  0x80U
+static struct sink_dpdm_cal_job_t g_sink_dpdm_cal_job[TOTAL_NOR_CHS] = {0};
 /* Sink协议/CC握手期间的0x20查询节流记录，按通道独立计时。 */
 static rt_bool_t g_sink_query_throttle[TOTAL_NOR_CHS] = {RT_FALSE};
 static rt_bool_t g_sink_query_first_pending[TOTAL_NOR_CHS] = {RT_FALSE};
@@ -144,6 +155,29 @@ void chrg_roll_nor_sink_reset_cancel(rt_uint8_t ch)
 	g_sink_cc_relay_restore_mask &= (rt_uint8_t)~SOURCE_CHANNEL_BIT(ch);
 }
 
+rt_bool_t chrg_roll_nor_sink_dpdm_cal_pending(rt_uint8_t ch)
+{
+	return (ch < TOTAL_NOR_CHS) && g_sink_dpdm_cal_job[ch].pending;
+}
+
+int chrg_roll_nor_sink_dpdm_cal_submit(rt_uint8_t ch,
+	struct chrg_switch_t *pSW, const struct sink_dpdm_cal_t *pCal)
+{
+	if ((ch >= TOTAL_NOR_CHS) || (pSW == RT_NULL) || (pCal == RT_NULL)) {
+		return -1;
+	}
+	/* 校准写入只抢占普通量测，不能覆盖初始化、协议/CC切换等事务。 */
+	if (g_sink_dpdm_cal_job[ch].pending || (pSW->id != ID_SINK) ||
+		(pSW->sub != IDX_GET_SINK_VC)) {
+		return -2;
+	}
+	g_sink_dpdm_cal_job[ch].cal = *pCal;
+	g_sink_dpdm_cal_job[ch].pending = RT_TRUE;
+	g_sink_dpdm_cal_job[ch].status = SINK_DPDM_CAL_STATUS_PENDING;
+	pSW->sub = IDX_SET_SINK_DPDM_CAL;
+	return 0;
+}
+
 void chrg_roll_nor_sink_cc_switch_prepare(rt_uint8_t ch,
 	rt_bool_t cc_changed)
 {
@@ -686,6 +720,8 @@ static rt_uint8_t chrg_roll_nor_expected_cmd(const struct chrg_switch_t *pSW)
 			return SINK_CMD_SET_CC;
 		case IDX_SET_SINK_CCLVL:
 			return SINK_CMD_SET_LEVEL;
+		case IDX_SET_SINK_DPDM_CAL:
+			return SINK_CMD_SET_DPDM_CAL;
 		default:
 			return 0;
 		}
@@ -729,8 +765,12 @@ static int chrg_roll_nor_response_matches(const struct mb_msg_t *pMB,
 	if ((expected_cmd == SRC_CMD_GET_VOLTAGE) && (pMB->length != 21U)) {
 		return -3;
 	}
+	if ((expected_cmd == SINK_CMD_SET_DPDM_CAL) && (pMB->length != 6U)) {
+		return -4;
+	}
 	if ((expected_cmd != SRC_CMD_GET_VOLTAGE) &&
 		(expected_cmd != SRC_CMD_GET_PROTOCOL) &&
+		(expected_cmd != SINK_CMD_SET_DPDM_CAL) &&
 		(pMB->length != MIN_FRAME_LENGTH)) {
 		return -4;
 	}
@@ -910,6 +950,11 @@ static int chrg_roll_nor_set(rt_uint8_t ch, struct chrg_switch_t *pSW,
 					return sink_set_cc_line(pSW->sink.cc_set);
 				case IDX_SET_SINK_CCLVL:							//CC电平
 					return sink_set_cc_lvl(pSW->sink.cc_lvl);
+				case IDX_SET_SINK_DPDM_CAL:
+					if (!g_sink_dpdm_cal_job[ch].pending) {
+						return -1;
+					}
+					return sink_set_dpdm_cal(&g_sink_dpdm_cal_job[ch].cal);
 				case IDX_SET_SINK_PD:
 					/* 只有协议回码确认后，下一轮才允许进入电压查询。 */
 					*next_sub = IDX_WAIT_SINK_PD_ACK;
@@ -1030,6 +1075,26 @@ static int chrg_roll_nor_auto_request(rt_uint8_t idx,
 						g_sink_reset_next_sub[idx] = 0U;
 						advance_sub = RT_FALSE;
 					}
+				} else if ((expected_id == ID_SINK) &&
+					(request_sub == IDX_SET_SINK_DPDM_CAL)) {
+					/*
+					 * 0x32回码格式：06 NC ID 32 STATUS CRC。
+					 * 只有STATUS为0才把任务参数提交到实时结构；否则保留原参数，
+					 * 并回到0x20普通量测状态，避免失败写入影响负载流程。
+					 */
+					g_sink_dpdm_cal_job[idx].pending = RT_FALSE;
+					g_sink_dpdm_cal_job[idx].status = pMB->payload[4];
+					pSW->sub = IDX_GET_SINK_VC;
+					advance_sub = RT_FALSE;
+					if (pMB->payload[4] == 0U) {
+						pSW->sink.dpdm_cal = g_sink_dpdm_cal_job[idx].cal;
+						g_sink_dpdm_cal_job[idx].status =
+							SINK_DPDM_CAL_STATUS_SUCCESS;
+						LOG_I("sink dpdm cal write success: ch=%d", idx + 1U);
+					} else {
+						LOG_E("sink dpdm cal write failed: ch=%d status=%u",
+							idx + 1U, pMB->payload[4]);
+					}
 				} else if ((expected_id == ID_SINK) &&
 					((request_sub == IDX_SET_SINK_CCLINE) ||
 					 (request_sub == IDX_SET_SINK_CC_BEFORE_PD) ||
@@ -1053,6 +1118,16 @@ static int chrg_roll_nor_auto_request(rt_uint8_t idx,
 	LOG_W("north request failed: ch=%d id=%02x cmd=%02x sub=%d attempts=%d",
 		idx + 1U, expected_id, expected_cmd, request_sub,
 		max_attempts);
+	if ((expected_id == ID_SINK) &&
+		(request_sub == IDX_SET_SINK_DPDM_CAL)) {
+		rt_mutex_take(pTHR->mutex, RT_WAITING_FOREVER);
+		g_sink_dpdm_cal_job[idx].pending = RT_FALSE;
+		g_sink_dpdm_cal_job[idx].status = SINK_DPDM_CAL_STATUS_TIMEOUT;
+		if (pSW->sub == IDX_SET_SINK_DPDM_CAL) {
+			pSW->sub = IDX_GET_SINK_VC;
+		}
+		rt_mutex_release(pTHR->mutex);
+	}
 	return -1;
 }
 
@@ -1152,6 +1227,18 @@ void chrg_roll_nor_thread_entry (void *data)
 				rt_thread_mdelay(2);
 				continue;
 			}
+			/* 校准写入任务不依赖通道运行使能，优先占用一次北向事务。 */
+			if (chrg_roll_nor_sink_dpdm_cal_pending(idx)) {
+				if ((chrg_north_switch((eIDX_NOR_CH)idx) == 0) &&
+					(chrg_north_request_begin((eIDX_NOR_CH)idx) != 0U)) {
+					pROLL->idx = idx;
+					(void)chrg_roll_nor_auto_request(idx, pSW,
+						pTHR, pTN, pNOR);
+				}
+				CHRG_CHANNEL_NEXT(index);
+				rt_thread_mdelay(NORTH_POLL_INTERVAL_MS);
+				continue;
+			}
 			if (source_waiting || sink_waiting) {
 				CHRG_CHANNEL_NEXT(index);
 				rt_thread_mdelay(2);
diff --git a/apps/chrg/applications/thread/chrg_roll_nor.h b/apps/chrg/applications/thread/chrg_roll_nor.h
index 75ad32e..cf197ba 100644
--- a/apps/chrg/applications/thread/chrg_roll_nor.h
+++ b/apps/chrg/applications/thread/chrg_roll_nor.h
@@ -11,6 +11,9 @@
 
 #include <rtthread.h>
 
+struct chrg_switch_t;
+struct sink_dpdm_cal_t;
+
 #define THR_NAME_ROLL_NOR		"thr.rollnor"
 #define STATE_WORKING 0x03//运行标志位
 enum {
@@ -41,7 +44,8 @@ enum {
 	IDX_SET_SINK_CC_BEFORE_PD_WITH_MODE,
 	IDX_WAIT_SINK_CC_BEFORE_PD_WITH_MODE,
 	IDX_SET_SINK_MODE_AFTER_PD,
-	IDX_WAIT_SINK_MODE_AFTER_PD
+	IDX_WAIT_SINK_MODE_AFTER_PD,
+	IDX_SET_SINK_DPDM_CAL            // 上位机校准参数写入Sink板0x32
 };
 
 struct chrg_rollnor_t {
@@ -112,6 +116,12 @@ extern void chrg_roll_nor_sink_cc_switch_prepare(rt_uint8_t ch,
 /* 低电流确认完成后，按登记结果断开D+/D-/CC继电器。 */
 extern void chrg_roll_nor_sink_cc_relay_close(rt_uint8_t ch);
 
+/* 提交Sink板D+/D-校准参数写入任务；仅空闲量测状态允许提交。 */
+extern int chrg_roll_nor_sink_dpdm_cal_submit(rt_uint8_t ch,
+	struct chrg_switch_t *pSW, const struct sink_dpdm_cal_t *pCal);
+/* 查询指定通道是否存在待执行的D+/D-校准写入任务。 */
+extern rt_bool_t chrg_roll_nor_sink_dpdm_cal_pending(rt_uint8_t ch);
+
 #define sink_time 3
 #endif
 
diff --git a/apps/chrg/applications/utils/chrg_def.h b/apps/chrg/applications/utils/chrg_def.h
index f47ea70..61ca267 100644
--- a/apps/chrg/applications/utils/chrg_def.h
+++ b/apps/chrg/applications/utils/chrg_def.h
@@ -14,8 +14,7 @@
 /* CHRG application version. Keep this value synchronized with the changelog. */
 #define CHRG_VERSION_MAJOR       1U
 #define CHRG_VERSION_MINOR       1U
-#define CHRG_VERSION_PATCH       55U
-#define CHRG_VERSION_STRING      "V1.1.55"
+
 
 /*
  * Channel polling mode:
diff --git a/apps/chrg/applications/utils/chrg_regs.h b/apps/chrg/applications/utils/chrg_regs.h
index c18391e..8456f72 100644
--- a/apps/chrg/applications/utils/chrg_regs.h
+++ b/apps/chrg/applications/utils/chrg_regs.h
@@ -152,6 +152,12 @@ enum {
 #define SINK_REG_DYNA_TIME2      0x1C  // ����2����ʱ�� (0.01ms)
 #define SINK_REG_DYNA_SLOPE      0x1D  // ��̬����б�� (0.001A/us)
 #define SINK_REG_DYNA_UNLOAD     0x1E  // ��̬ж��б�� (0.001A/us)
+/* D+/D-У׼������KΪ�޷���16λ��ʵ�ʱ���ϵ����10000����BΪ�з���16λ��0.01V����
+ * ��λ��д�������д��ͨ��SYS_REG_PARAM_EFFECT=1����405ת��Sink 0x32�� */
+#define SINK_REG_DPDM_DZ_K       0x1F  // D+ K
+#define SINK_REG_DPDM_DZ_B       0x20  // D+ B
+#define SINK_REG_DPDM_DF_K       0x21  // D- K
+#define SINK_REG_DPDM_DF_B       0x22  // D- B
 
 // ---- ��Դ(Source)����ƫ�� (���ͨ������ַ: HOLD_REG_SRC_BASE + ch*6) ----
 #define SRC_REG_PROTOCOL         0x00  // ������
diff --git a/apps/chrg/applications/utils/chrg_sink.c b/apps/chrg/applications/utils/chrg_sink.c
index a9c6c17..610dfbd 100644
--- a/apps/chrg/applications/utils/chrg_sink.c
+++ b/apps/chrg/applications/utils/chrg_sink.c
@@ -302,6 +302,33 @@ int sink_set_pd (rt_uint8_t pd, rt_uint8_t *buf)
 	return chrg_north_send(frame, len);
 }
 
+/*****************************************************************
+函数名称： sink_set_dpdm_cal
+函数描述： 向Sink协议板写入D+/D-校准参数
+输入参数： pCal:四个16位校准参数
+输出参数： -
+返回说明： <0:发送失败 >0:发送长度
+其它说明： 所有字段按高字节在前发送；B按int16_t补码原样发送
+*****************************************************************/
+int sink_set_dpdm_cal(const struct sink_dpdm_cal_t *pCal)
+{
+	rt_uint16_t len = 0U;
+	rt_uint8_t data[8] = {0};
+	rt_uint8_t frame[16] = {0};
+
+	if (pCal == RT_NULL) {
+		return -1;
+	}
+	u16_to_u8v(pCal->dz_k, &data[0]);
+	u16_to_u8v((rt_uint16_t)pCal->dz_b, &data[2]);
+	u16_to_u8v(pCal->df_k, &data[4]);
+	u16_to_u8v((rt_uint16_t)pCal->df_b, &data[6]);
+	/* 发送帧：0D NC 01 32 DZ_K DZ_B DF_K DF_B CRC，四个16位字段均为大端。 */
+	chrg_north_pkg_encode(ID_SINK, SINK_CMD_SET_DPDM_CAL,
+		data, sizeof(data), frame, &len);
+	return chrg_north_send(frame, len);
+}
+
 static rt_uint8_t chrg_sink_init_build_commands(struct chrg_switch_t *pSW,
 	rt_uint16_t *regs, rt_uint16_t *vals)
 {
diff --git a/apps/chrg/applications/utils/chrg_sink.h b/apps/chrg/applications/utils/chrg_sink.h
index 9c3d409..426cd83 100644
--- a/apps/chrg/applications/utils/chrg_sink.h
+++ b/apps/chrg/applications/utils/chrg_sink.h
@@ -71,7 +71,15 @@ struct test
 
 #define SINK_CMD_GET_VOLTAGE	0x20	// 读取变电压板电压 
 #define SINK_CMD_RESET			0x01	// 复位Sink协议板
+#define SINK_CMD_SET_DPDM_CAL	0x32	// 写入D+/D-校准参数
 
+/* D+/D-校准系数：K为实际比例系数放大10000倍，B单位为0.01V。 */
+struct sink_dpdm_cal_t {
+	rt_uint16_t dz_k;
+	rt_int16_t dz_b;
+	rt_uint16_t df_k;
+	rt_int16_t df_b;
+};
 
 struct sink_vc_t {
 	rt_uint8_t			voltage;	// 电压 0.01V
@@ -215,7 +223,7 @@ enum {
 /* Sink电压稳定确认参数，供chrg_sink_volt_judge使用。 */
 #define SINK_VOLT_5V_TARGET_MV            5000U
 #define SINK_VOLT_CONFIRM_NORMAL_COUNT       3U
-#define SINK_VOLT_CONFIRM_5V_COUNT          12U
+#define SINK_VOLT_CONFIRM_5V_COUNT          3U
 #define SINK_CURRENT_START_GRACE_MS         200U
 
 /* 主继电器闭合后的0V持续监控：由北向轮询线程每轮调用，掉电立即转掉电保护。 */
@@ -266,6 +274,7 @@ struct chrg_sink_t {
     rt_uint8_t          change_cv_flag;
     rt_uint8_t          change_source_flag;         // 从sink切换到source标志位
     rt_uint8_t          work_mode;                      // 0=停止 1=工作 2=低电压  
+	struct sink_dpdm_cal_t dpdm_cal;                  // 上位机待写入Sink板的D+/D-校准参数
 };
 
 //纹波寄存器
@@ -408,6 +417,16 @@ extern int sink_set_cc_lvl (rt_uint8_t lvl);
 其它说明： -
 *****************************************************************/
 extern int sink_set_pd (rt_uint8_t pd, rt_uint8_t *buf);
+
+/*****************************************************************
+函数名称： sink_set_dpdm_cal
+函数描述： 向Sink协议板写入D+/D-校准参数
+输入参数： pCal:四个16位校准参数
+输出参数： -
+返回说明： <0:发送失败 >0:发送长度
+其它说明： 发送0x32；K为×10000，B为0.01V有符号补码
+*****************************************************************/
+extern int sink_set_dpdm_cal(const struct sink_dpdm_cal_t *pCal);
 // ===================== 负载测试函数声明 =====================
 extern void sink_test_short_set (struct chrg_switch_t *pSW, rt_uint8_t *pData, rt_uint8_t run_flag);
 extern void sink_test_ocp_set   (struct chrg_switch_t *pSW, rt_uint8_t *pData, rt_uint8_t run_flag);
diff --git a/docs/QMP4810300-4多协议可编程双向电源通信协议V_1.2.xlsx b/docs/QMP4810300-4多协议可编程双向电源通信协议V_1.2.xlsx
index c263bf5..9fced9d 100644
Binary files a/docs/QMP4810300-4多协议可编程双向电源通信协议V_1.2.xlsx and b/docs/QMP4810300-4多协议可编程双向电源通信协议V_1.2.xlsx differ
diff --git a/docs/修改日志.md b/docs/修改日志.md
index 08c6e10..2483f12 100644
--- a/docs/修改日志.md
+++ b/docs/修改日志.md
@@ -1,5 +1,15 @@
 # 修改日志
 
+## V1.1.56 - 2026-10-09
+
+### Sink板D+/D-校准参数写入
+
+- 增加每通道四个16位D+/D-校准参数：D+K、D+B、D-K、D-B；K按10000倍传递，B为0.01V有符号值。
+- 上位机写入参数并触发原有 `PARAM_EFFECT` 后，405通过北向Sink板 `0x32` 指令写入参数。
+- 写入任务复用北向通道切换、事务号和回码校验；仅在通道空闲量测状态提交，完成后恢复普通轮询。
+- 本版本不包含 `0x31` 采样、`0x33` 读取、`0x34` 恢复和五点拟合。
+- 协议板版本寄存器 `0x0300` 更新为 `0x0148`。
+
 ## V1.1.55 - 2026-10-09
 
 ### Sink协议切换复位开关